Chromium Code Reviews Chromium Code Reviews
Issue 2449973006:
Styleguide cleanup part 1. (Closed)
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| 1 <!DOCTYPE html> | 1 <!DOCTYPE html> |
| 2 <!-- | 2 <!-- |
| 3 Copyright 2014 The Chromium Authors. All rights reserved. | 3 Copyright 2014 The Chromium Authors. All rights reserved. |
| 4 Use of this source code is governed by a BSD-style license that can be | 4 Use of this source code is governed by a BSD-style license that can be |
| 5 found in the LICENSE file. | 5 found in the LICENSE file. |
| 6 --> | 6 --> |
| 7 <html> | 7 <html> |
| 8 <head> | 8 <head> |
| 9 <meta charset="utf-8"> | 9 <meta charset="utf-8"> |
| 10 <title>C++11 use in Chromium</title> | 10 <title>C++11 use in Chromium</title> |
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| 71 <th style='width:260px;'>Snippet</th> | 71 <th style='width:260px;'>Snippet</th> |
| 72 <th style='width:240px;'>Description</th> | 72 <th style='width:240px;'>Description</th> |
| 73 <th style='width:240px;'>Documentation Link</th> | 73 <th style='width:240px;'>Documentation Link</th> |
| 74 <th style='width:240px;'>Notes and Discussion Thread</th> | 74 <th style='width:240px;'>Notes and Discussion Thread</th> |
| 75 </tr> | 75 </tr> |
| 76 | 76 |
| 77 <tr> | 77 <tr> |
| 78 <td>__func__ Local Variable</td> | 78 <td>__func__ Local Variable</td> |
| 79 <td><code>__func__</code></td> | 79 <td><code>__func__</code></td> |
| 80 <td>Provides a local variable containing the name of the enclosing function</td> | 80 <td>Provides a local variable containing the name of the enclosing function</td> |
| 81 <td><a href="https://msdn.microsoft.com/en-us/library/dn919276.aspx">__func__</a ></td> | 81 <td><a href="http://en.cppreference.com/w/cpp/language/function#func">__func__</ a></td> |
| 82 <td>Use instead of the non-standard <code>__FUNCTION__</code>. <a href="https:// groups.google.com/a/chromium.org/forum/#!topic/chromium-dev/ojGfcgSDzHM">Discuss ion thread</a></td> | 82 <td>Use instead of the non-standard <code>__FUNCTION__</code>. <a href="https:// groups.google.com/a/chromium.org/forum/#!topic/chromium-dev/ojGfcgSDzHM">Discuss ion thread</a></td> |
| 83 </tr> | 83 </tr> |
| 84 | 84 |
| 85 <tr> | 85 <tr> |
| 86 <td>Aliases</td> | 86 <td>Aliases</td> |
| 87 <td><code>using <i>new_alias</i> = <i>typename</i></code></td> | 87 <td><code>using <i>new_alias</i> = <i>typename</i></code></td> |
| 88 <td>Allow parameterized typedefs</td> | 88 <td>Allow parameterized typedefs</td> |
| 89 <td><a href="http://en.cppreference.com/w/cpp/language/type_alias">Type alias (u sing syntax)</a></td> | 89 <td><a href="http://en.cppreference.com/w/cpp/language/type_alias">Type alias, a lias template</a></td> |
|
danakj
2016/10/29 01:02:47
I think calling out the word "using" was useful he
Peter Kasting
2016/10/29 06:15:37
I'm happy to call it out in the other sections, bu
| |
| 90 <td>Use instead of typedef, unless the header needs to be compatible with C. <a href="https://groups.google.com/a/chromium.org/forum/#!topic/chromium-dev/8dOAMz gR4ao">Discussion thread</a></td> | 90 <td>Use instead of typedef, unless the header needs to be compatible with C. <a href="https://groups.google.com/a/chromium.org/forum/#!topic/chromium-dev/8dOAMz gR4ao">Discussion thread</a></td> |
| 91 </tr> | 91 </tr> |
| 92 | 92 |
| 93 <tr> | 93 <tr> |
| 94 <td>Angle Bracket Parsing in Templates</td> | 94 <td>Angle Bracket Parsing in Templates</td> |
| 95 <td><code>>></code> for <code>> ></code>, <code><::</code> for <c ode>< ::</code></td> | 95 <td><code>>></code> for <code>> ></code>, <code><::</code> for <c ode>< ::</code></td> |
| 96 <td>More intuitive parsing of template parameters</td> | 96 <td>More intuitive parsing of template parameters</td> |
| 97 <td><a href="http://stackoverflow.com/questions/15785496/c-templates-angle-brack ets-pitfall-what-is-the-c11-fix">C++ Templates Angle Brackets Pitfall</a></td> | 97 <td><a href="http://stackoverflow.com/questions/15785496/c-templates-angle-brack ets-pitfall-what-is-the-c11-fix">C++ templates angle brackets pitfall</a></td> |
| 98 <td>Recommended to increase readability. Approved without discussion.</td> | 98 <td>Recommended to increase readability. Approved without discussion.</td> |
| 99 </tr> | 99 </tr> |
| 100 | 100 |
| 101 <tr> | 101 <tr> |
| 102 <td>Arrays</td> | 102 <td>Arrays</td> |
| 103 <td><code>std::array</code></td> | 103 <td><code>std::array</code></td> |
| 104 <td>A fixed-size replacement for built-in arrays, with STL support</td> | 104 <td>A fixed-size replacement for built-in arrays, with STL support</td> |
| 105 <td><a href="http://en.cppreference.com/w/cpp/container/array">std::array</a></t d> | 105 <td><a href="http://en.cppreference.com/w/cpp/container/array">std::array</a></t d> |
| 106 <td>Useful in performance-critical situations, with small, fixed-size arrays. In most cases, consider std::vector instead. std::vector is cheaper to std::move a nd is more widely used. <a href="https://groups.google.com/a/chromium.org/forum/ #!topic/cxx/pVRQCRWHEU8">Discussion thread</a>.</td> | 106 <td>Useful in performance-critical situations, with small, fixed-size arrays. In most cases, consider std::vector instead. std::vector is cheaper to std::move a nd is more widely used. <a href="https://groups.google.com/a/chromium.org/forum/ #!topic/cxx/pVRQCRWHEU8">Discussion thread</a>.</td> |
| 107 </tr> | 107 </tr> |
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| 155 <td><a href="https://www.ibm.com/developerworks/community/blogs/5894415f-be62-4b c0-81c5-3956e82276f3/entry/introduction_to_the_c_11_feature_delegating_construct ors?lang=en">Introduction to the C++11 feature: delegating constructors</a></td> | 155 <td><a href="https://www.ibm.com/developerworks/community/blogs/5894415f-be62-4b c0-81c5-3956e82276f3/entry/introduction_to_the_c_11_feature_delegating_construct ors?lang=en">Introduction to the C++11 feature: delegating constructors</a></td> |
| 156 <td><a href="https://groups.google.com/a/chromium.org/forum/#!topic/chromium-dev /0zVA8Ctx3Xo">Discussion thread</a></td> | 156 <td><a href="https://groups.google.com/a/chromium.org/forum/#!topic/chromium-dev /0zVA8Ctx3Xo">Discussion thread</a></td> |
| 157 </tr> | 157 </tr> |
| 158 | 158 |
| 159 <tr> | 159 <tr> |
| 160 <td>Enumerated Type Classes and Enum Bases</td> | 160 <td>Enumerated Type Classes and Enum Bases</td> |
| 161 <td><code>enum class <i>classname</i><br /> | 161 <td><code>enum class <i>classname</i><br /> |
| 162 enum class <i>classname</i> : <i>base-type</i><br /> | 162 enum class <i>classname</i> : <i>base-type</i><br /> |
| 163 enum <i>enumname</i> : <i>base-type</i></code></td> | 163 enum <i>enumname</i> : <i>base-type</i></code></td> |
| 164 <td>Provide enums as full classes, with no implicit conversion to booleans or in tegers. Provide an explicit underlying type for enum classes and regular enums.< /td> | 164 <td>Provide enums as full classes, with no implicit conversion to booleans or in tegers. Provide an explicit underlying type for enum classes and regular enums.< /td> |
| 165 <td><a href="http://www.stroustrup.com/C++11FAQ.html#enum">enum-class</a></td> | 165 <td><a href="http://en.cppreference.com/w/cpp/language/enum">enumeration declara tion</a></td> |
| 166 <td>Enum classes are still enums and follow enum naming rules (which means SHOUT Y_CASE in the <a href="http://www.chromium.org/developers/coding-style#Naming">C hromium Style Guide</a>). <a href="https://groups.google.com/a/chromium.org/foru m/#!topic/chromium-dev/Q5WmkAImanc">Discussion thread</a></td> | 166 <td>Enum classes are still enums and follow enum naming rules (which means SHOUT Y_CASE in the <a href="http://www.chromium.org/developers/coding-style#Naming">C hromium Style Guide</a>). <a href="https://groups.google.com/a/chromium.org/foru m/#!topic/chromium-dev/Q5WmkAImanc">Discussion thread</a></td> |
| 167 </tr> | 167 </tr> |
| 168 | 168 |
| 169 <tr> | 169 <tr> |
| 170 <td>Explicit Conversion Operators</td> | 170 <td>Explicit Conversion Operators</td> |
| 171 <td><code>explicit operator <i>type</i>() { ... }</code></td> | 171 <td><code>explicit operator <i>type</i>() { ... }</code></td> |
| 172 <td>Allows conversion operators that cannot be implicitly invoked</td> | 172 <td>Allows conversion operators that cannot be implicitly invoked</td> |
| 173 <td><a href="http://en.cppreference.com/w/cpp/language/explicit">explicit specif ier</a></td> | 173 <td><a href="http://en.cppreference.com/w/cpp/language/explicit">explicit specif ier</a></td> |
| 174 <td>Prefer to the "safe bool" idiom. <a href="https://groups.google.com/a/chromi um.org/d/msg/chromium-dev/zGF1SrQ-1HQ/BAiC12vwPeEJ">Discussion thread</a></td> | 174 <td>Prefer to the "safe bool" idiom. <a href="https://groups.google.com/a/chromi um.org/d/msg/chromium-dev/zGF1SrQ-1HQ/BAiC12vwPeEJ">Discussion thread</a></td> |
| 175 </tr> | 175 </tr> |
| 176 | 176 |
| 177 <tr> | 177 <tr> |
| 178 <td>Final Specifier</td> | 178 <td>Final Specifier</td> |
| 179 <td><code>final</code></td> | 179 <td><code>final</code></td> |
| 180 <td> Indicates that a class or function is final and cannot be overridden</td> | 180 <td> Indicates that a class or function is final and cannot be overridden</td> |
| 181 <td><a href="http://en.cppreference.com/w/cpp/language/final">final Language Ref erence</a></td> | 181 <td><a href="http://en.cppreference.com/w/cpp/language/final">final specifier</a ></td> |
| 182 <td>Recommended for new code. <a href="https://groups.google.com/a/chromium.org/ forum/#!topic/chromium-dev/VTNZzizN0zo">Discussion thread</a></td> | 182 <td>Recommended for new code. <a href="https://groups.google.com/a/chromium.org/ forum/#!topic/chromium-dev/VTNZzizN0zo">Discussion thread</a></td> |
| 183 </tr> | 183 </tr> |
| 184 | 184 |
| 185 <tr> | 185 <tr> |
| 186 <td>Function Suppression</td> | 186 <td>Function Suppression</td> |
| 187 <td><code><i>Function</i>(<i>arguments</i>) = delete;</code></td> | 187 <td><code><i>Function</i>(<i>arguments</i>) = delete;</code></td> |
| 188 <td>Suppresses the implementation of a function, especially a synthetic function such as a copy constructor</td> | 188 <td>Suppresses the implementation of a function, especially a synthetic function such as a copy constructor</td> |
| 189 <td>TODO: documentation link</td> | 189 <td><a href="http://en.cppreference.com/w/cpp/language/function#Deleted_function s">Deleted functions</a></td> |
| 190 <td><a href="https://groups.google.com/a/chromium.org/forum/#!topic/chromium-dev /i1o7-RNRnMs">Discussion thread</a></td> | 190 <td><a href="https://groups.google.com/a/chromium.org/forum/#!topic/chromium-dev /i1o7-RNRnMs">Discussion thread</a></td> |
| 191 </tr> | 191 </tr> |
| 192 | 192 |
| 193 <tr> | 193 <tr> |
| 194 <td>Lambda Expressions</td> | 194 <td>Lambda Expressions</td> |
| 195 <td><code>[<i>captures</i>](<i>params</i>) -> <i>ret</i> { <i>body</i> }</cod e></td> | 195 <td><code>[<i>captures</i>](<i>params</i>) -> <i>ret</i> { <i>body</i> }</cod e></td> |
| 196 <td>Anonymous functions</td> | 196 <td>Anonymous functions</td> |
| 197 <td><a href="http://en.cppreference.com/w/cpp/language/lambda">Lambda functions< /a></td> | 197 <td><a href="http://en.cppreference.com/w/cpp/language/lambda">Lambda functions< /a></td> |
| 198 <td>Do not bind or store capturing lambdas outside the lifetime of the stack fra me they are defined in. Captureless lambdas can be used with <code>base::Callbac k</code>, such as <code>base::Bind([](int j){}, i);</code>, because they offer p rotection against a large class of object lifetime mistakes. Don't use default c aptures (<code>[=]</code>, <code>[&]</code> – <a href="https://google. github.io/styleguide/cppguide.html#Lambda_expressions">Google Style Guide</a>). Lambdas are typically useful as a parameter to methods or functions that will us e them immediately, such as those in <code><algorithm></code>. <a href="ht tps://groups.google.com/a/chromium.org/forum/#!topic/chromium-dev/D9UnnxBnciQ">D iscussion thread</a>, <a href="https://groups.google.com/a/chromium.org/forum/#! topic/cxx/QxjsPELDYdQ">uncapturing thread</a>. | 198 <td>Do not bind or store capturing lambdas outside the lifetime of the stack fra me they are defined in. Captureless lambdas can be used with <code>base::Callbac k</code>, such as <code>base::Bind([](int j){}, i);</code>, because they offer p rotection against a large class of object lifetime mistakes. Don't use default c aptures (<code>[=]</code>, <code>[&]</code> – <a href="https://google. github.io/styleguide/cppguide.html#Lambda_expressions">Google Style Guide</a>). Lambdas are typically useful as a parameter to methods or functions that will us e them immediately, such as those in <code><algorithm></code>. <a href="ht tps://groups.google.com/a/chromium.org/forum/#!topic/chromium-dev/D9UnnxBnciQ">D iscussion thread</a>, <a href="https://groups.google.com/a/chromium.org/forum/#! topic/cxx/QxjsPELDYdQ">uncapturing thread</a>. |
| 199 </td> | 199 </td> |
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| 219 C() // copy-initializes <i>var</i></code> | 219 C() // copy-initializes <i>var</i></code> |
| 220 <td>Allows non-static class members to be initialized at their definitions (outs ide constructors)</td> | 220 <td>Allows non-static class members to be initialized at their definitions (outs ide constructors)</td> |
| 221 <td><a href="http://en.cppreference.com/w/cpp/language/data_members">Non-static data members</a></td> | 221 <td><a href="http://en.cppreference.com/w/cpp/language/data_members">Non-static data members</a></td> |
| 222 <td><a href="https://groups.google.com/a/chromium.org/forum/#!topic/chromium-dev /zqB-DySA4V0">Discussion thread</a></td> | 222 <td><a href="https://groups.google.com/a/chromium.org/forum/#!topic/chromium-dev /zqB-DySA4V0">Discussion thread</a></td> |
| 223 </tr> | 223 </tr> |
| 224 | 224 |
| 225 <tr> | 225 <tr> |
| 226 <td>Null Pointer Constant</td> | 226 <td>Null Pointer Constant</td> |
| 227 <td><code>nullptr</code></td> | 227 <td><code>nullptr</code></td> |
| 228 <td>Declares a type-safe null pointer</td> | 228 <td>Declares a type-safe null pointer</td> |
| 229 <td><a href="http://en.cppreference.com/w/cpp/language/nullptr">nullptr</a></td> | 229 <td><a href="http://en.cppreference.com/w/cpp/language/nullptr">nullptr, the poi nter literal</a></td> |
| 230 <td>Prefer over <code>NULL</code> or <code>0</code>. <a href="https://groups.goo gle.com/a/chromium.org/forum/#!topic/chromium-dev/4mijeJHzxLg">Discussion thread </a>. <a href="https://google.github.io/styleguide/cppguide.html#0_and_nullptr/N ULL">Google Style Guide</a>. <code>std::nullptr_t</code> can be used too.</td> | 230 <td>Prefer over <code>NULL</code> or <code>0</code>. <a href="https://groups.goo gle.com/a/chromium.org/forum/#!topic/chromium-dev/4mijeJHzxLg">Discussion thread </a>. <a href="https://google.github.io/styleguide/cppguide.html#0_and_nullptr/N ULL">Google Style Guide</a>. <code>std::nullptr_t</code> can be used too.</td> |
| 231 </tr> | 231 </tr> |
| 232 | 232 |
| 233 <tr> | 233 <tr> |
| 234 <td>Override Specifier</td> | 234 <td>Override Specifier</td> |
| 235 <td><code>override</code></td> | 235 <td><code>override</code></td> |
| 236 <td>Indicates that a class or function overrides a base implementation</td> | 236 <td>Indicates that a class or function overrides a base implementation</td> |
| 237 <td><a href="http://en.cppreference.com/w/cpp/language/override">override Langua ge Reference</a></td> | 237 <td><a href="http://en.cppreference.com/w/cpp/language/override">override specif ier</a></td> |
| 238 <td>Recommended for new code. <a href="https://groups.google.com/a/chromium.org/ forum/#!topic/chromium-dev/VTNZzizN0zo">Discussion thread</a></td> | 238 <td>Recommended for new code. <a href="https://groups.google.com/a/chromium.org/ forum/#!topic/chromium-dev/VTNZzizN0zo">Discussion thread</a></td> |
| 239 </tr> | 239 </tr> |
| 240 | 240 |
| 241 <tr> | 241 <tr> |
| 242 <td>Range-Based For Loops</td> | 242 <td>Range-Based For Loops</td> |
| 243 <td><code>for (<i>type</i> <i>var</i> : <i>range</i>)</code></td> | 243 <td><code>for (<i>type</i> <i>var</i> : <i>range</i>)</code></td> |
| 244 <td>Facilitates a more concise syntax for iterating over the elements of a conta iner (or a range of iterators) in a <code>for</code> loop</td> | 244 <td>Facilitates a more concise syntax for iterating over the elements of a conta iner (or a range of iterators) in a <code>for</code> loop</td> |
| 245 <td><a href="http://en.cppreference.com/w/cpp/language/range-for">Range-based fo r loop</a></td> | 245 <td><a href="http://en.cppreference.com/w/cpp/language/range-for">Range-based fo r loop</a></td> |
| 246 <td>As a rule of thumb, use <code>for (const auto& ...)</code>, <code>for (auto& ...)</code>, or <code>for (<i>concrete type</i> ...)</code>. For pointers, use <code>for (auto* ...)</code> to make clear that the copy of the loop variable is intended, and only a pointer is copied. <a href="https://groups.google.com/a/ch romium.org/forum/#!topic/chromium-dev/hpzz4EqbVmc">Discussion thread</a></td> | 246 <td>As a rule of thumb, use <code>for (const auto& ...)</code>, <code>for (auto& ...)</code>, or <code>for (<i>concrete type</i> ...)</code>. For pointers, use <code>for (auto* ...)</code> to make clear that the copy of the loop variable is intended, and only a pointer is copied. <a href="https://groups.google.com/a/ch romium.org/forum/#!topic/chromium-dev/hpzz4EqbVmc">Discussion thread</a></td> |
| 247 </tr> | 247 </tr> |
| 248 | 248 |
| 249 <tr> | 249 <tr> |
| 250 <td>Rvalue References</td> | 250 <td>Rvalue References</td> |
| 251 <td><code>T(T&& t)</code> and <code>T& operator=(T&& t)<br/> <br/> | 251 <td><code>T(T&& t)</code> and <code>T& operator=(T&& t)<br/> <br/> |
| 252 template <typename T><br/>void Function(T&& t) { ... }</code></td> | 252 template <typename T><br/>void Function(T&& t) { ... }</code></td> |
| 253 <td>Reference that only binds to a temporary object</td> | 253 <td>Reference that only binds to a temporary object</td> |
| 254 <td><a href="http://en.cppreference.com/w/cpp/language/references#Rvalue_referen ces">Rvalue references</a></td> | 254 <td><a href="http://en.cppreference.com/w/cpp/language/reference#Rvalue_referenc es">Rvalue references</a></td> |
| 255 <td>As per the <a href="https://google.github.io/styleguide/cppguide.html#Rvalue _references">Google Style Guide</a>: Only use these to define move constructors and move assignment operators, and for perfect forwarding. Most classes should n ot be copyable, even if movable. Continue to use DISALLOW_COPY_AND_ASSIGN in mos t cases. <a href="https://groups.google.com/a/chromium.org/d/topic/chromium-dev/ UnRaORb4TSw">Discussion thread</a>. <a href="https://groups.google.com/a/chromiu m.org/d/topic/cxx/Q526tkruXpM">Another discussion thread</a>.</td> | 255 <td>As per the <a href="https://google.github.io/styleguide/cppguide.html#Rvalue _references">Google Style Guide</a>: Only use these to define move constructors and move assignment operators, and for perfect forwarding. Most classes should n ot be copyable, even if movable. Continue to use DISALLOW_COPY_AND_ASSIGN in mos t cases. <a href="https://groups.google.com/a/chromium.org/d/topic/chromium-dev/ UnRaORb4TSw">Discussion thread</a>. <a href="https://groups.google.com/a/chromiu m.org/d/topic/cxx/Q526tkruXpM">Another discussion thread</a>.</td> |
| 256 </tr> | 256 </tr> |
| 257 | 257 |
| 258 <tr> | 258 <tr> |
| 259 <td>Standard Integers</td> | 259 <td>Standard Integers</td> |
| 260 <td>Typedefs within <code><stdint.h></code> and <code><inttypes></co de></td> | 260 <td>Typedefs within <code><stdint.h></code> and <code><inttypes></co de></td> |
| 261 <td>Provides fixed-size integers independent of platforms</td> | 261 <td>Provides fixed-size integers independent of platforms</td> |
| 262 <td><a href="http://www.cplusplus.com/reference/cstdint/"><stdint.h> (cstd int)</a></td> | 262 <td><a href="http://en.cppreference.com/w/cpp/header/cstdint">Standard library h eader <cstdint></a></td> |
| 263 <td>Already in common use in the codebase. Approved without discussion.</td> | 263 <td>Already in common use in the codebase. Approved without discussion.</td> |
| 264 </tr> | 264 </tr> |
| 265 | 265 |
| 266 <tr> | 266 <tr> |
| 267 <td>Static Assertions</td> | 267 <td>Static Assertions</td> |
| 268 <td><code>static_assert(<i>bool</i>, <i>string</i>)</code></td> | 268 <td><code>static_assert(<i>bool</i>, <i>string</i>)</code></td> |
| 269 <td>Tests compile-time conditions</td> | 269 <td>Tests compile-time conditions</td> |
| 270 <td><a href="http://en.cppreference.com/w/cpp/language/static_assert">Static Ass ertion</a></td> | 270 <td><a href="http://en.cppreference.com/w/cpp/language/static_assert">Static Ass ertion</a></td> |
| 271 <td><a href="https://groups.google.com/a/chromium.org/forum/#!topic/chromium-dev /POISBQEhGzU">Discussion thread</a></td> | 271 <td><a href="https://groups.google.com/a/chromium.org/forum/#!topic/chromium-dev /POISBQEhGzU">Discussion thread</a></td> |
| 272 </tr> | 272 </tr> |
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| 284 <td><code><i>type</i> <i>name</i> {[<i>value</i> ..., <i>value</i>]};</code></td > | 284 <td><code><i>type</i> <i>name</i> {[<i>value</i> ..., <i>value</i>]};</code></td > |
| 285 <td>Allows any object of primitive, aggregate or class type to be initialized us ing brace syntax</td> | 285 <td>Allows any object of primitive, aggregate or class type to be initialized us ing brace syntax</td> |
| 286 <td><a href="http://www.stroustrup.com/C++11FAQ.html#uniform-init">Uniform initi alization syntax and semantics</a></td> | 286 <td><a href="http://www.stroustrup.com/C++11FAQ.html#uniform-init">Uniform initi alization syntax and semantics</a></td> |
| 287 <td>See the <a href="https://www.chromium.org/developers/coding-style/cpp-dos-an d-donts?pli=1#TOC-Variable-initialization">Chromium C++ Dos And Don'ts guidance< /a> on when to use this. <a href="https://groups.google.com/a/chromium.org/forum /#!topic/chromium-dev/GF96FshwHLw">Discussion thread</a></td> | 287 <td>See the <a href="https://www.chromium.org/developers/coding-style/cpp-dos-an d-donts?pli=1#TOC-Variable-initialization">Chromium C++ Dos And Don'ts guidance< /a> on when to use this. <a href="https://groups.google.com/a/chromium.org/forum /#!topic/chromium-dev/GF96FshwHLw">Discussion thread</a></td> |
| 288 </tr> | 288 </tr> |
| 289 | 289 |
| 290 <tr> | 290 <tr> |
| 291 <td>Union Class Members</td> | 291 <td>Union Class Members</td> |
| 292 <td><code>union <i>name</i> {<i>class</i> <i>var</i>}</code></td> | 292 <td><code>union <i>name</i> {<i>class</i> <i>var</i>}</code></td> |
| 293 <td>Allows class type members</td> | 293 <td>Allows class type members</td> |
| 294 <td><a href="http://en.cppreference.com/w/cpp/language/union">Union declarations </a></td> | 294 <td><a href="http://en.cppreference.com/w/cpp/language/union">Union declaration< /a></td> |
| 295 <td>Usage should be rare.</td> | 295 <td>Usage should be rare.</td> |
| 296 </tr> | 296 </tr> |
| 297 | 297 |
| 298 <tr> | 298 <tr> |
| 299 <td>Variadic Macros</td> | 299 <td>Variadic Macros</td> |
| 300 <td><code>#define <i>MACRO</i>(...) <i>Impl</i>(<i>args</i>, __VA_ARGS__)</code> </td> | 300 <td><code>#define <i>MACRO</i>(...) <i>Impl</i>(<i>args</i>, __VA_ARGS__)</code> </td> |
| 301 <td>Allows macros that accept a variable number of arguments</td> | 301 <td>Allows macros that accept a variable number of arguments</td> |
| 302 <td><a href="http://stackoverflow.com/questions/4786649/are-variadic-macros-nons tandard">Are Variadic macros nonstandard?</a></td> | 302 <td><a href="http://stackoverflow.com/questions/4786649/are-variadic-macros-nons tandard">Are Variadic macros nonstandard?</a></td> |
| 303 <td>Usage should be rare. <a href="https://groups.google.com/a/chromium.org/foru m/#!topic/chromium-dev/sRx9j3CQqyA">Discussion thread</a></td> | 303 <td>Usage should be rare. <a href="https://groups.google.com/a/chromium.org/foru m/#!topic/chromium-dev/sRx9j3CQqyA">Discussion thread</a></td> |
| 304 </tr> | 304 </tr> |
| 305 | 305 |
| 306 <tr> | 306 <tr> |
| 307 <td>Variadic Templates</td> | 307 <td>Variadic Templates</td> |
| 308 <td><code>template <<i>typename</i> ... <i>arg</i>></code></td> | 308 <td><code>template <<i>typename</i> ... <i>arg</i>></code></td> |
| 309 <td>Allows templates that accept a variable number of arguments</td> | 309 <td>Allows templates that accept a variable number of arguments</td> |
| 310 <td><a href="http://en.cppreference.com/w/cpp/language/parameter_pack">Parameter pack</a></td> | 310 <td><a href="http://en.cppreference.com/w/cpp/language/parameter_pack#Template_p arameter_list">Template parameter list</a></td> |
|
danakj
2016/10/29 01:02:47
Why is this going to this specific use of ... inst
Peter Kasting
2016/10/29 06:15:37
Will revert.
| |
| 311 <td>Usage should be rare. Use instead of .pump files. <a href="https://groups.go ogle.com/a/chromium.org/forum/#!topic/chromium-dev/6ItymeMXpMc">Discussion threa d</a></td> | 311 <td>Usage should be rare. Use instead of .pump files. <a href="https://groups.go ogle.com/a/chromium.org/forum/#!topic/chromium-dev/6ItymeMXpMc">Discussion threa d</a></td> |
| 312 </tr> | 312 </tr> |
| 313 | 313 |
| 314 </tbody> | 314 </tbody> |
| 315 </table> | 315 </table> |
| 316 | 316 |
| 317 <h2 id="whitelist"><a name="library-whitelist"></a>C++11 Allowed Library Feature s</h2> | 317 <h2 id="whitelist"><a name="library-whitelist"></a>C++11 Allowed Library Feature s</h2> |
| 318 | 318 |
| 319 <p>The following library features are currently allowed.</p> | 319 <p>The following library features are currently allowed.</p> |
| 320 | 320 |
| (...skipping 23 matching lines...) Expand all Loading... | |
| 344 <code>find_if_not</code><br/> | 344 <code>find_if_not</code><br/> |
| 345 <code>copy_if</code>, <code>copy_n</code><br/> | 345 <code>copy_if</code>, <code>copy_n</code><br/> |
| 346 <code>move</code>, <code>move_backward</code> (see note)<br/> | 346 <code>move</code>, <code>move_backward</code> (see note)<br/> |
| 347 <code>shuffle</code><br/> | 347 <code>shuffle</code><br/> |
| 348 <code>is_partitioned</code>, <code>partition_copy</code>, <code>partition_point< /code><br/> | 348 <code>is_partitioned</code>, <code>partition_copy</code>, <code>partition_point< /code><br/> |
| 349 <code>is_sorted</code>, <code>is_sorted_until</code><br/> | 349 <code>is_sorted</code>, <code>is_sorted_until</code><br/> |
| 350 <code>is_heap</code>, <code>is_heap_until</code><br/> | 350 <code>is_heap</code>, <code>is_heap_until</code><br/> |
| 351 <code>minmax</code>, <code>minmax_element</code><br/> | 351 <code>minmax</code>, <code>minmax_element</code><br/> |
| 352 <code>is_permutation<br/></td> | 352 <code>is_permutation<br/></td> |
| 353 <td>Safe and performant implementations of common algorithms</td> | 353 <td>Safe and performant implementations of common algorithms</td> |
| 354 <td><a href="http://en.cppreference.com/w/cpp/header/algorithm"><algorithm> ;</a></td> | 354 <td><a href="http://en.cppreference.com/w/cpp/header/algorithm">Standard library header <algorithm></a></td> |
| 355 <td><a href="https://groups.google.com/a/chromium.org/forum/#!topic/cxx/UJQk8S1I uHk">Discussion thread</a><br/> Note that <algorithm> contains a range-bas ed <code>move</code> method. This is allowed, but because people may confuse it with the single-arg <code>std::move</code>, there is often a way to write code w ithout it that is more readable. <a href='https://groups.google.com/a/chromium.o rg/forum/#!topic/cxx/8WzmtYrZvQ8'>Discussion thread</a></td> | 355 <td><a href="https://groups.google.com/a/chromium.org/forum/#!topic/cxx/UJQk8S1I uHk">Discussion thread</a><br/> Note that <algorithm> contains a range-bas ed <code>move</code> method. This is allowed, but because people may confuse it with the single-arg <code>std::move</code>, there is often a way to write code w ithout it that is more readable. <a href='https://groups.google.com/a/chromium.o rg/forum/#!topic/cxx/8WzmtYrZvQ8'>Discussion thread</a></td> |
| 356 </tr> | 356 </tr> |
| 357 | 357 |
| 358 <tr> | 358 <tr> |
| 359 <td>Begin and End Non-Member Functions</td> | 359 <td>Begin and End Non-Member Functions</td> |
| 360 <td><code>std::begin()</code>, <code>std::end()</code></td> | 360 <td><code>std::begin()</code>, <code>std::end()</code></td> |
| 361 <td>Allows use of free functions on any container, including fixed-size arrays</ td> | 361 <td>Allows use of free functions on any container, including fixed-size arrays</ td> |
| 362 <td><a href="http://en.cppreference.com/w/cpp/iterator/begin">std::begin</a>, <a href="http://en.cppreference.com/w/cpp/iterator/end">std::end</a></td> | 362 <td><a href="http://en.cppreference.com/w/cpp/iterator/begin">std::begin</a>, <a href="http://en.cppreference.com/w/cpp/iterator/end">std::end</a></td> |
| 363 <td>Useful for fixed-size arrays. Note that non-member <code>cbegin()</code> and <code>cend()</code> are not available until C++14. <a href="https://groups.goog le.com/a/chromium.org/d/topic/cxx/5iFNE8P5qT4/discussion">Discussion thread</a>< /td> | 363 <td>Useful for fixed-size arrays. Note that non-member <code>cbegin()</code> and <code>cend()</code> are not available until C++14. <a href="https://groups.goog le.com/a/chromium.org/d/topic/cxx/5iFNE8P5qT4/discussion">Discussion thread</a>< /td> |
| 364 </tr> | 364 </tr> |
| 365 | 365 |
| 366 <tr> | 366 <tr> |
| 367 <td>Conditional Type Selection</td> | 367 <td>Conditional Type Selection</td> |
| 368 <td><code>std::enable_if</code>, <code>std::conditional</code></td> | 368 <td><code>std::enable_if</code>, <code>std::conditional</code></td> |
| 369 <td>Enables compile-time conditional type selection</td> | 369 <td>Enables compile-time conditional type selection</td> |
| 370 <td><a href="http://en.cppreference.com/w/cpp/types/enable_if">std::enable_if</a >, <a href="http://en.cppreference.com/w/cpp/types/conditional">conditional</a>< /td> | 370 <td><a href="http://en.cppreference.com/w/cpp/types/enable_if">std::enable_if</a >, <a href="http://en.cppreference.com/w/cpp/types/conditional">conditional</a>< /td> |
| 371 <td>Usage should be rare. <a href='https://groups.google.com/a/chromium.org/foru m/#!topic/cxx/vCxo4tZNd_M'>Discussion thread</a></td> | 371 <td>Usage should be rare. <a href='https://groups.google.com/a/chromium.org/foru m/#!topic/cxx/vCxo4tZNd_M'>Discussion thread</a></td> |
| 372 </tr> | 372 </tr> |
| 373 | 373 |
| 374 <tr> | 374 <tr> |
| 375 <td>Constant Iterator Methods on Containers</td> | 375 <td>Constant Iterator Methods on Containers</td> |
| 376 <td>E.g. <code>std::vector::cbegin()</code>, <code>std::vector::cend()</code></t d> | 376 <td>E.g. <code>std::vector::cbegin()</code>, <code>std::vector::cend()</code></t d> |
| 377 <td>Allows more widespread use of <code>const_iterator</code></td> | 377 <td>Allows more widespread use of <code>const_iterator</code></td> |
| 378 <td><a href="http://en.cppreference.com/w/cpp/container/vector/begin">std::vecto r::cbegin</a>, <a href="http://en.cppreference.com/w/cpp/container/vector/end">s td::vector::cend<a></td> | 378 <td><a href="http://en.cppreference.com/w/cpp/container/vector/begin">std::vecto r::cbegin</a>, <a href="http://en.cppreference.com/w/cpp/container/vector/end">s td::vector::cend<a></td> |
| 379 <td>Applies to all containers, not just <code>vector</code>. Consider using <cod e>const_iterator</code> over <code>iterator</code> where possible for the same r eason as using <code>const</code> variables and functions where possible; see Ef fective Modern C++ item 13 for motivation. <a href="https://groups.google.com/a/ chromium.org/d/topic/cxx/cS83F_buqLM/discussion">Discussion thread</a></td> | 379 <td>Applies to all containers, not just <code>vector</code>. Consider using <cod e>const_iterator</code> over <code>iterator</code> where possible for the same r eason as using <code>const</code> variables and functions where possible; see Ef fective Modern C++ item 13 for motivation. <a href="https://groups.google.com/a/ chromium.org/d/topic/cxx/cS83F_buqLM/discussion">Discussion thread</a></td> |
| 380 </tr> | 380 </tr> |
| 381 | 381 |
| 382 <tr> | 382 <tr> |
| 383 <td>Containers containing movable types</td> | 383 <td>Containers containing move-only types</td> |
| 384 <td><code>vector<scoped_ptr></code></td> | 384 <td><code>vector<scoped_ptr></code></td> |
| 385 <td>Enables containers that contain move-only types like <code>scoped_ptr</code> </td> | 385 <td>Enables containers that contain move-only types like <code>scoped_ptr</code> </td> |
| 386 <td>TODO</td> | 386 <td>TODO</td> |
| 387 <td>Prefer over <a href="http://crbug.com/554289">ScopedVector</a>.</td> | 387 <td>Prefer over <a href="http://crbug.com/554289">ScopedVector</a>.</td> |
| 388 </tr> | 388 </tr> |
| 389 | 389 |
| 390 <tr> | 390 <tr> |
| 391 <td>Declared Type As Value</td> | 391 <td>Declared Type As Value</td> |
| 392 <td><code>std::declval<<i>class</i>>()</code></td> | 392 <td><code>std::declval<<i>class</i>>()</code></td> |
| 393 <td>Converts a type to a reference of the type to allow use of members of the ty pe without constructing it in templates.</td> | 393 <td>Converts a type to a reference of the type to allow use of members of the ty pe without constructing it in templates.</td> |
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| 421 </tr> | 421 </tr> |
| 422 | 422 |
| 423 <tr> | 423 <tr> |
| 424 <td>Math functions</td> | 424 <td>Math functions</td> |
| 425 <td>All C++11 features in <code><cmath></code>, e.g.:<br/> | 425 <td>All C++11 features in <code><cmath></code>, e.g.:<br/> |
| 426 <code>INFINITY</code>, <code>NAN</code>, <code>FP_NAN</code><br/> | 426 <code>INFINITY</code>, <code>NAN</code>, <code>FP_NAN</code><br/> |
| 427 <code>float_t</code>, <code>double_t</code><br/> | 427 <code>float_t</code>, <code>double_t</code><br/> |
| 428 <code>fmax</code>, <code>fmin</code>, <code>trunc</code>, <code>round</code><br/ > | 428 <code>fmax</code>, <code>fmin</code>, <code>trunc</code>, <code>round</code><br/ > |
| 429 <code>isinf</code>, <code>isnan</code><br/></td> | 429 <code>isinf</code>, <code>isnan</code><br/></td> |
| 430 <td>Useful for math-related code</td> | 430 <td>Useful for math-related code</td> |
| 431 <td><a href="http://en.cppreference.com/w/cpp/header/cmath"><cmath></a></t d> | 431 <td><a href="http://en.cppreference.com/w/cpp/header/cmath">Standard library hea der <cmath></a></td> |
| 432 <td><a href="https://groups.google.com/a/chromium.org/forum/#!topic/cxx/P-1bFBXM eUk">Discussion thread</a></td> | 432 <td><a href="https://groups.google.com/a/chromium.org/forum/#!topic/cxx/P-1bFBXM eUk">Discussion thread</a></td> |
| 433 </tr> | 433 </tr> |
| 434 | 434 |
| 435 <tr> | 435 <tr> |
| 436 <td>Move Iterator Adaptor</td> | 436 <td>Move Iterator Adaptor</td> |
| 437 <td><code>std::make_move_iterator()</code></td> | 437 <td><code>std::make_move_iterator()</code></td> |
| 438 <td>Wraps an iterator so that it moves objects instead of copying them.</td> | 438 <td>Wraps an iterator so that it moves objects instead of copying them.</td> |
| 439 <td><a href="http://en.cppreference.com/w/cpp/iterator/make_move_iterator">std:: make_move_iterator</a></td> | 439 <td><a href="http://en.cppreference.com/w/cpp/iterator/make_move_iterator">std:: make_move_iterator</a></td> |
| 440 <td>Useful to move objects between containers that contain move-only types like <code>scoped_ptr</code>. <a href="https://groups.google.com/a/chromium.org/forum /#!topic/cxx/lccnUljOHQU">Discussion thread</a></td> | 440 <td>Useful to move objects between containers that contain move-only types like <code>scoped_ptr</code>. <a href="https://groups.google.com/a/chromium.org/forum /#!topic/cxx/lccnUljOHQU">Discussion thread</a></td> |
| 441 </tr> | 441 </tr> |
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| 458 | 458 |
| 459 <tr> | 459 <tr> |
| 460 <td>Type Traits</td> | 460 <td>Type Traits</td> |
| 461 <td>All C++11 features in <code><type_traits></code> except for aligned st orage (see separate item), e.g.:<br/> | 461 <td>All C++11 features in <code><type_traits></code> except for aligned st orage (see separate item), e.g.:<br/> |
| 462 <code>integral_constant</code><br/> | 462 <code>integral_constant</code><br/> |
| 463 <code>is_floating_point</code>, <code>is_rvalue_reference</code>, <code>is_scala r</code><br/> | 463 <code>is_floating_point</code>, <code>is_rvalue_reference</code>, <code>is_scala r</code><br/> |
| 464 <code>is_const</code>, <code>is_pod</code>, <code>is_unsigned</code><br/> | 464 <code>is_const</code>, <code>is_pod</code>, <code>is_unsigned</code><br/> |
| 465 <code>is_default_constructible</code>, <code>is_move_constructible</code>, <code >is_copy_assignable</code><br/> | 465 <code>is_default_constructible</code>, <code>is_move_constructible</code>, <code >is_copy_assignable</code><br/> |
| 466 <code>enable_if</code>, <code>conditional</code>, <code>result_of</code><br/></t d> | 466 <code>enable_if</code>, <code>conditional</code>, <code>result_of</code><br/></t d> |
| 467 <td>Allows compile-time inspection of the properties of types</td> | 467 <td>Allows compile-time inspection of the properties of types</td> |
| 468 <td><a href="http://en.cppreference.com/w/cpp/header/type_traits"><type_trait s></a></td> | 468 <td><a href="http://en.cppreference.com/w/cpp/header/type_traits">Standard libra ry header <type_traits></a></td> |
| 469 <td>Note that not all type traits are available on all platforms (e.g. <code>std ::underlying_type</code> doesn't work in libstdc++4.6). Use judiciously. <a href ='https://groups.google.com/a/chromium.org/forum/#!topic/cxx/vCxo4tZNd_M'>Discus sion thread</a></td> | 469 <td>Note that not all type traits are available on all platforms (e.g. <code>std ::underlying_type</code> doesn't work in libstdc++4.6). Use judiciously. <a href ='https://groups.google.com/a/chromium.org/forum/#!topic/cxx/vCxo4tZNd_M'>Discus sion thread</a></td> |
| 470 </tr> | 470 </tr> |
| 471 | 471 |
| 472 <tr> | 472 <tr> |
| 473 <td>Tuples</td> | 473 <td>Tuples</td> |
| 474 <td>All C++11 features in <code><tuple></code>, e.g. <code>std::tie</code> and <code>std::tuple</code>.</td> | 474 <td>All C++11 features in <code><tuple></code>, e.g. <code>std::tie</code> and <code>std::tuple</code>.</td> |
| 475 <td>A fixed-size ordered collection of values of mixed types</td> | 475 <td>A fixed-size ordered collection of values of mixed types</td> |
| 476 <td><a href="http://en.cppreference.com/w/cpp/header/tuple"><tuple></a></t d> | 476 <td><a href="http://en.cppreference.com/w/cpp/header/tuple">Standard library hea der <tuple></a></td> |
| 477 <td>Use <code>base::get</code> instead of <code>std::get</code> in case the <cod e>std::tuple</code> may be a rvalue-reference. | 477 <td>Use <code>base::get</code> instead of <code>std::get</code> in case the <cod e>std::tuple</code> may be a rvalue-reference. |
| 478 <code>std::get</code> in <=libstdc++-4.6 misses an overload for rvalue-refere nce of a tuple, and <code>base::get</code> complements it. </td> | 478 <code>std::get</code> in <=libstdc++-4.6 misses an overload for rvalue-refere nce of a tuple, and <code>base::get</code> complements it. </td> |
| 479 </tr> | 479 </tr> |
| 480 | 480 |
| 481 <tr> | 481 <tr> |
| 482 <td>Unordered Associative Containers</td> | 482 <td>Unordered Associative Containers</td> |
| 483 <td><code>std::unordered_set</code>, <code>std::unordered_map</code>, <code>std: :unordered_multiset</code>, <code>std::unordered_multimap</code></td> | 483 <td><code>std::unordered_set</code>, <code>std::unordered_map</code>, <code>std: :unordered_multiset</code>, <code>std::unordered_multimap</code></td> |
| 484 <td>Allows efficient containers of key/value pairs</td> | 484 <td>Allows efficient containers of key/value pairs</td> |
| 485 <td><a href="http://en.cppreference.com/w/cpp/container/unordered_map">std::unor dered_map</a>, <a href="http://en.cppreference.com/w/cpp/container/unordered_set ">std::unordered_set</a></td> | 485 <td><a href="http://en.cppreference.com/w/cpp/container/unordered_map">std::unor dered_map</a>, <a href="http://en.cppreference.com/w/cpp/container/unordered_set ">std::unordered_set</a></td> |
| 486 <td>Per the <a href="https://google.github.io/styleguide/cppguide.html#std_hash" >Google Style Guide</a>, specify custom hashers instead of specializing <code>st d::hash</code> for custom types. <a href="https://groups.google.com/a/chromium.o rg/forum/#!topic/cxx/nCdjQqnouO4">Discussion thread</a>.</td> | 486 <td>Per the <a href="https://google.github.io/styleguide/cppguide.html#std_hash" >Google Style Guide</a>, specify custom hashers instead of specializing <code>st d::hash</code> for custom types. <a href="https://groups.google.com/a/chromium.o rg/forum/#!topic/cxx/nCdjQqnouO4">Discussion thread</a>.</td> |
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| 515 <th style='width:240px;'>Snippet</th> | 515 <th style='width:240px;'>Snippet</th> |
| 516 <th style='width:240px;'>Description</th> | 516 <th style='width:240px;'>Description</th> |
| 517 <th style='width:240px;'>Documentation Link</th> | 517 <th style='width:240px;'>Documentation Link</th> |
| 518 <th style='width:240px;'>Notes</th> | 518 <th style='width:240px;'>Notes</th> |
| 519 </tr> | 519 </tr> |
| 520 | 520 |
| 521 <tr> | 521 <tr> |
| 522 <td>Alignment Features</td> | 522 <td>Alignment Features</td> |
| 523 <td><code>alignas</code> specifier, <code>alignof</code> operator</td> | 523 <td><code>alignas</code> specifier, <code>alignof</code> operator</td> |
| 524 <td>Object alignment</td> | 524 <td>Object alignment</td> |
| 525 <td><a href="http://en.cppreference.com/w/cpp/language/alignas">alignas</a>, <a href="http://en.cppreference.com/w/cpp/language/alignof">alignof</a></td> | 525 <td><a href="http://en.cppreference.com/w/cpp/language/alignas">alignas specifie r</a>, <a href="http://en.cppreference.com/w/cpp/language/alignof">alignof opera tor</a></td> |
| 526 <td>Reevaluate now that MSVS2015 is available. <a href="https://groups.google.co m/a/chromium.org/d/msg/cxx/rwXN02jzzq0/CpUc1ZzMBQAJ">Discussion thread</a></td> | 526 <td>Reevaluate now that MSVS2015 is available. <a href="https://groups.google.co m/a/chromium.org/d/msg/cxx/rwXN02jzzq0/CpUc1ZzMBQAJ">Discussion thread</a></td> |
| 527 </tr> | 527 </tr> |
| 528 | 528 |
| 529 <tr> | 529 <tr> |
| 530 <td>Inherited Constructors</td> | 530 <td>Inherited Constructors</td> |
| 531 <td><code>class Derived : Base {<br /> | 531 <td><code>class Derived : Base {<br /> |
| 532 using Base::Base;<br /> | 532 using Base::Base;<br /> |
| 533 };</code></td> | 533 };</code></td> |
| 534 <td>Allow derived classes to inherit constructors from base classes</td> | 534 <td>Allow derived classes to inherit constructors from base classes</td> |
| 535 <td><a href="http://en.cppreference.com/w/cpp/language/using_declaration">Using- declaration</a></td> | 535 <td><a href="http://en.cppreference.com/w/cpp/language/using_declaration">Using- declaration</a></td> |
| 536 <td>Reevaluate now that MSVS2015 is available. <a href="https://groups.google.co m/a/chromium.org/d/msg/chromium-dev/BULzgIKZ-Ao/PLO7_GoVNvYJ">Discussion thread< /a></td> | 536 <td>Reevaluate now that MSVS2015 is available. <a href="https://groups.google.co m/a/chromium.org/d/msg/chromium-dev/BULzgIKZ-Ao/PLO7_GoVNvYJ">Discussion thread< /a></td> |
| 537 </tr> | 537 </tr> |
| 538 | 538 |
| 539 <tr> | 539 <tr> |
| 540 <td><code>long long</code> Type</td> | 540 <td><code>long long</code> Type</td> |
| 541 <td><code>long long <i>var</i>= <i>value</i>;</code></td> | 541 <td><code>long long <i>var</i> = <i>value</i>;</code></td> |
| 542 <td>An integer of at least 64 bits</td> | 542 <td>An integer of at least 64 bits</td> |
| 543 <td><a href="http://en.cppreference.com/w/cpp/language/types">Fundamental types< /a></td> | 543 <td><a href="http://en.cppreference.com/w/cpp/language/types">Fundamental types< /a></td> |
| 544 <td>Use a stdint.h type if you need a 64bit number. <a href="https://groups.goog le.com/a/chromium.org/forum/#!topic/chromium-dev/RxugZ-pIDxk">Discussion thread< /a></td> | 544 <td>Use a stdint.h type if you need a 64bit number. <a href="https://groups.goog le.com/a/chromium.org/forum/#!topic/chromium-dev/RxugZ-pIDxk">Discussion thread< /a></td> |
| 545 </tr> | 545 </tr> |
| 546 | 546 |
| 547 <tr> | 547 <tr> |
| 548 <td>Raw String Literals</td> | 548 <td>Raw String Literals</td> |
| 549 <td><code>string <i>var</i>=R"(<i>raw_string</i>)";</code></td> | 549 <td><code>string <i>var</i>=R"(<i>raw_string</i>)";</code></td> |
| 550 <td>Allows a string to be encoded without any escape sequences, easing parsing i n regex expressions, for example</td> | 550 <td>Allows a string to be encoded without any escape sequences, easing parsing i n regex expressions, for example</td> |
| 551 <td><a href="http://en.cppreference.com/w/cpp/language/string_literal">string li teral</a></td> | 551 <td><a href="http://en.cppreference.com/w/cpp/language/string_literal">string li teral</a></td> |
| (...skipping 19 matching lines...) Expand all Loading... | |
| 571 <tr> | 571 <tr> |
| 572 <td>Ref-qualified Member Functions</td> | 572 <td>Ref-qualified Member Functions</td> |
| 573 <td><code>class T {<br /> | 573 <td><code>class T {<br /> |
| 574 void f() & {}<br /> | 574 void f() & {}<br /> |
| 575 void f() && {}<br /> | 575 void f() && {}<br /> |
| 576 };<br /> | 576 };<br /> |
| 577 t.f(); // first<br /> | 577 t.f(); // first<br /> |
| 578 T().f(); // second<br /> | 578 T().f(); // second<br /> |
| 579 std::move(t).f(); // second</code></td> | 579 std::move(t).f(); // second</code></td> |
| 580 <td>Allows class member functions to only bind to |this| as an rvalue or lvalue. </td> | 580 <td>Allows class member functions to only bind to |this| as an rvalue or lvalue. </td> |
| 581 <td><a href="http://en.cppreference.com/w/cpp/language/member_functions">Member functions</a></td> | 581 <td><a href="http://en.cppreference.com/w/cpp/language/member_functions#const-.2 C_volatile-.2C_and_ref-qualified_member_functions">const-, volatile-, and ref-qu alified member functions</a></td> |
| 582 <td>Banned in the <a href="https://google.github.io/styleguide/cppguide.html#C++ 11">Google Style Guide</a>. Banned in Chromium except by explicit approval from <code>styleguide/c++/OWNERS</code>. <a href="https://groups.google.com/a/chromiu m.org/d/topic/cxx/gowclr2LPQA/discussion">Discussion Thread</a></td> | 582 <td>Banned in the <a href="https://google.github.io/styleguide/cppguide.html#C++ 11">Google Style Guide</a>. May be used in Chromium only with explicit approval from <code>styleguide/c++/OWNERS</code>. <a href="https://groups.google.com/a/ch romium.org/d/topic/cxx/gowclr2LPQA/discussion">Discussion Thread</a></td> |
|
danakj
2016/10/29 01:02:47
Kinda like the harder wording that starts with "Ba
Peter Kasting
2016/10/29 06:15:37
The reason I changed it was that if it's banned in
Peter Kasting
2016/10/31 17:46:10
I changed the wording just slightly to "May only b
| |
| 583 </tr> | 583 </tr> |
| 584 | 584 |
| 585 </tbody> | 585 </tbody> |
| 586 </table> | 586 </table> |
| 587 | 587 |
| 588 <h3 id="blacklist_stdlib"><a name="library-blacklist"></a>C++11 Banned Library F eatures</h3> | 588 <h3 id="blacklist_stdlib"><a name="library-blacklist"></a>C++11 Banned Library F eatures</h3> |
| 589 | 589 |
| 590 <p>This section lists C++11 library features that are not allowed in the Chromiu m codebase.</p> | 590 <p>This section lists C++11 library features that are not allowed in the Chromiu m codebase.</p> |
| 591 | 591 |
| 592 <table id="blacklist_lib_list" class="unlined striped"> | 592 <table id="blacklist_lib_list" class="unlined striped"> |
| 593 <tbody> | 593 <tbody> |
| 594 | 594 |
| 595 <tr> | 595 <tr> |
| 596 <th style='width:240px;'>Feature</th> | 596 <th style='width:240px;'>Feature</th> |
| 597 <th style='width:240px;'>Snippet</th> | 597 <th style='width:240px;'>Snippet</th> |
| 598 <th style='width:240px;'>Description</th> | 598 <th style='width:240px;'>Description</th> |
| 599 <th style='width:240px;'>Documentation Link</th> | 599 <th style='width:240px;'>Documentation Link</th> |
| 600 <th style='width:240px;'>Notes</th> | 600 <th style='width:240px;'>Notes</th> |
| 601 </tr> | 601 </tr> |
| 602 | 602 |
| 603 <tr> | 603 <tr> |
| 604 <td>Chrono Library</td> | 604 <td>Date and time utilities</td> |
| 605 <td><code><chrono></code></td> | 605 <td><code><chrono></code></td> |
| 606 <td>Provides a standard date and time library</td> | 606 <td>A standard date and time library</td> |
| 607 <td><a href="http://en.cppreference.com/w/cpp/chrono">Date and time utilities</a ></td> | 607 <td><a href="http://en.cppreference.com/w/cpp/chrono">Date and time utilities</a ></td> |
| 608 <td>Duplicated <code>Time</code> APIs in <code>base/</code>. Keep using the <cod e>base/</code> classes.</td> | 608 <td>Overlaps with <code>Time</code> APIs in <code>base/</code>. Keep using the < code>base/</code> classes.</td> |
| 609 </tr> | 609 </tr> |
| 610 | 610 |
| 611 <tr> | 611 <tr> |
| 612 <td>Regex Library</td> | 612 <td>Regular Expressions</td> |
| 613 <td><code><regex></code></td> | 613 <td><code><regex></code></td> |
| 614 <td>Provides a standard regular expressions library</td> | 614 <td>A standard regular expressions library</td> |
| 615 <td><a href="http://en.cppreference.com/w/cpp/regex">Regular expressions library </a></td> | 615 <td><a href="http://en.cppreference.com/w/cpp/regex">Regular expressions library </a></td> |
| 616 <td>We already have too many regular expression libraries in Chromium. Use re2 w hen in doubt.</td> | 616 <td>Overlaps with many regular expression libraries in Chromium. When in doubt, use re2.</td> |
| 617 </tr> | 617 </tr> |
| 618 | 618 |
| 619 <tr> | 619 <tr> |
| 620 <td>Thread Library</td> | 620 <td>Thread Library</td> |
| 621 <td><code><thread></code> support, including<br /> | 621 <td><code><thread></code> and related headers, including<br /> |
| 622 <code><future></code>, <code><mutex></code>, <code><condition_var iable></code></td> | 622 <code><future></code>, <code><mutex></code>, <code><condition_var iable></code></td> |
| 623 <td>Provides a standard mulitthreading library using <code>std::thread</code> an d associates</td> | 623 <td>Provides a standard multithreading library using <code>std::thread</code> an d associates</td> |
| 624 <td><a href="http://en.cppreference.com/w/cpp/thread">Thread support library</a> </td> | 624 <td><a href="http://en.cppreference.com/w/cpp/thread">Thread support library</a> </td> |
| 625 <td>C++11 has all kinds of classes for threads, mutexes, etc. Since we already h ave good code for this in <code>base/</code>, we should keep using the base clas ses, at least at first. <code>base::Thread</code> is tightly coupled to <code>Me ssageLoop</code> which would make it hard to replace. We should investigate usin g standard mutexes, or unique_lock, etc. to replace our locking/synchronization classes.</td> | 625 <td>Overlaps with many classes in <code>base/</code>. Keep using the <code>base/ </code> classes for now. <code>base::Thread</code> is tightly coupled to <code>M essageLoop</code> which would make it hard to replace. We should investigate usi ng standard mutexes, or unique_lock, etc. to replace our locking/synchronization classes.</td> |
| 626 </tr> | 626 </tr> |
| 627 | 627 |
| 628 <tr> | 628 <tr> |
| 629 <td>Atomics</td> | 629 <td>Atomics</td> |
| 630 <td><code>std::atomic</code> and others in <code><atomic></code></td> | 630 <td><code><atomic></code></td> |
| 631 <td>Fine-grained atomic types and operations</td> | 631 <td>Fine-grained atomic types and operations</td> |
| 632 <td><a href="http://en.cppreference.com/w/cpp/atomic"><atomic></a></td> | 632 <td><a href="http://en.cppreference.com/w/cpp/atomic">Atomic operations library< /a></td> |
| 633 <td>Use in tcmalloc has caused <a href="http://crbug.com/572525">performance reg ressions</a>. Banned until we understand this better. <a href="https://groups.go ogle.com/a/chromium.org/d/topic/cxx/Ej3RAiaI44s/discussion">Discussion Thread</a ></td> | 633 <td>Use in tcmalloc has caused <a href="http://crbug.com/572525">performance reg ressions</a>. Banned until we understand this better. <a href="https://groups.go ogle.com/a/chromium.org/d/topic/cxx/Ej3RAiaI44s/discussion">Discussion Thread</a ></td> |
| 634 </tr> | 634 </tr> |
| 635 | 635 |
| 636 <tr> | 636 <tr> |
| 637 <td>Shared Pointers</td> | 637 <td>Shared Pointers</td> |
| 638 <td><code>std::shared_ptr</code></td> | 638 <td><code>std::shared_ptr</code></td> |
| 639 <td>Allows shared ownership of a pointer through reference counts</td> | 639 <td>Allows shared ownership of a pointer through reference counts</td> |
| 640 <td><a href="http://en.cppreference.com/w/cpp/memory/shared_ptr">std::shared_ptr </a></td> | 640 <td><a href="http://en.cppreference.com/w/cpp/memory/shared_ptr">std::shared_ptr </a></td> |
| 641 <td>Needs a lot more evaluation for Chromium, and there isn't enough of a push f or this feature. <a href="https://google.github.io/styleguide/cppguide.html#Owne rship_and_Smart_Pointers">Google Style Guide</a>. <a href="https://groups.google .com/a/chromium.org/d/topic/cxx/aT2wsBLKvzI/discussion">Discussion Thread</a>.</ td> | 641 <td>Needs a lot more evaluation for Chromium, and there isn't enough of a push f or this feature. <a href="https://google.github.io/styleguide/cppguide.html#Owne rship_and_Smart_Pointers">Google Style Guide</a>. <a href="https://groups.google .com/a/chromium.org/d/topic/cxx/aT2wsBLKvzI/discussion">Discussion Thread</a>.</ td> |
| 642 </tr> | 642 </tr> |
| (...skipping 22 matching lines...) Expand all Loading... | |
| 665 | 665 |
| 666 <tr> | 666 <tr> |
| 667 <td>Attributes</td> | 667 <td>Attributes</td> |
| 668 <td><code>[[<i>attribute_name</i>]]</code></td> | 668 <td><code>[[<i>attribute_name</i>]]</code></td> |
| 669 <td>Attaches properties to declarations that specific compiler implementations m ay use.</td> | 669 <td>Attaches properties to declarations that specific compiler implementations m ay use.</td> |
| 670 <td><a href="http://www.codesynthesis.com/~boris/blog/2012/04/18/cxx11-generaliz ed-attributes/">C++11 generalized attributes</a></td> | 670 <td><a href="http://www.codesynthesis.com/~boris/blog/2012/04/18/cxx11-generaliz ed-attributes/">C++11 generalized attributes</a></td> |
| 671 <td></td> | 671 <td></td> |
| 672 </tr> | 672 </tr> |
| 673 | 673 |
| 674 <tr> | 674 <tr> |
| 675 <td>Exception Features</td> | 675 <td>Exceptions</td> |
| 676 <td><code>noexcept</code>, <code>exception_ptr</code>, <code>current_exception() </code>, <code>rethrow_exception</code>, <code>nested_exception</code></td> | 676 <td><code>noexcept</code> and features in <code><exception></code></td> |
| 677 <td>Enhancements to exception throwing and handling</td> | 677 <td>Enhancements to exception throwing and handling</td> |
| 678 <td><a href="http://en.cppreference.com/w/cpp/error/exception">std::exception</a ></td> | 678 <td><a href="http://en.cppreference.com/w/cpp/header/exception">Standard library header <exception></a></td> |
| 679 <td>Exceptions are banned by the <a href="https://google.github.io/styleguide/cp pguide.html#Exceptions">Google Style Guide</a>. <a href="https://groups.google.c om/a/chromium.org/forum/#!topic/chromium-dev/8i4tMqNpHhg">Discussion thread</a>< /td> | 679 <td>Exceptions are banned by the <a href="https://google.github.io/styleguide/cp pguide.html#Exceptions">Google Style Guide</a> and disabled in Chromium compiles . <a href="https://groups.google.com/a/chromium.org/forum/#!topic/chromium-dev/8 i4tMqNpHhg">Discussion thread</a></td> |
| 680 </tr> | 680 </tr> |
| 681 | 681 |
| 682 <tr> | 682 <tr> |
| 683 <td>Inline Namespaces</td> | 683 <td>Inline Namespaces</td> |
| 684 <td><code>inline</code></td> | 684 <td><code>inline namespace foo { ... }</code></td> |
| 685 <td>Allows better versioning of namespaces</td> | 685 <td>Allows better versioning of namespaces</td> |
| 686 <td><a href="http://en.cppreference.com/w/cpp/language/namespace">Namespaces</a> </td> | 686 <td><a href="http://en.cppreference.com/w/cpp/language/namespace#Inline_namespac es">Inline namespaces</a></td> |
| 687 <td>Unclear how it will work with components</td> | 687 <td>Banned in the <a href="https://google.github.io/styleguide/cppguide.html#Nam espaces">Google Style Guide</a>. Unclear how it will work with components.</td> |
| 688 </tr> | 688 </tr> |
| 689 | 689 |
| 690 <tr> | 690 <tr> |
| 691 <td>User-Defined Literals</td> | 691 <td>User-Defined Literals</td> |
| 692 <td><code><i>type</i> <i>var</i> = <i>literal_value</i>_<i>type</i></code></td> | 692 <td><code><i>type</i> <i>var</i> = <i>literal_value</i>_<i>type</i></code></td> |
| 693 <td>Allows user-defined literal expressions</td> | 693 <td>Allows user-defined literal expressions</td> |
| 694 <td><a href="http://en.cppreference.com/w/cpp/language/user_literal">User-define d literals</a></td> | 694 <td><a href="http://en.cppreference.com/w/cpp/language/user_literal">User-define d literals</a></td> |
| 695 <td></td> | 695 <td>Banned in the <a href="https://google.github.io/styleguide/cppguide.html#Ope rator_Overloading">Google Style Guide</a>.</td> |
| 696 </tr> | 696 </tr> |
| 697 | 697 |
| 698 </tbody> | 698 </tbody> |
| 699 </table> | 699 </table> |
| 700 | 700 |
| 701 <h3 id="blacklist_stdlib_review"><a name="library-review"></a>C++11 Standard Lib rary Features To Be Discussed</h3> | 701 <h3 id="blacklist_stdlib_review"><a name="library-review"></a>C++11 Standard Lib rary Features To Be Discussed</h3> |
| 702 | 702 |
| 703 <p>The following C++ library features are currently disallowed. See the top of t his page on how to propose moving a feature from this list into the allowed or b anned sections. Note that not all of these features work in all our compilers ye t.</p> | 703 <p>The following C++ library features are currently disallowed. See the top of t his page on how to propose moving a feature from this list into the allowed or b anned sections. Note that not all of these features work in all our compilers ye t.</p> |
| 704 | 704 |
| 705 <table id="banned_stdlib" class="unlined striped"> | 705 <table id="banned_stdlib" class="unlined striped"> |
| (...skipping 29 matching lines...) Expand all Loading... | |
| 735 <td><code>std::allocator_traits</code></td> | 735 <td><code>std::allocator_traits</code></td> |
| 736 <td>Provides an interface for accessing custom allocators</td> | 736 <td>Provides an interface for accessing custom allocators</td> |
| 737 <td><a href="http://en.cppreference.com/w/cpp/memory/allocator_traits">std::allo cator_traits</a></td> | 737 <td><a href="http://en.cppreference.com/w/cpp/memory/allocator_traits">std::allo cator_traits</a></td> |
| 738 <td>Usage should be rare.</td> | 738 <td>Usage should be rare.</td> |
| 739 </tr> | 739 </tr> |
| 740 | 740 |
| 741 <tr> | 741 <tr> |
| 742 <td>Bind Operations</td> | 742 <td>Bind Operations</td> |
| 743 <td><code>std::bind(<i>function</i>, <i>args</i>, ...)</code></td> | 743 <td><code>std::bind(<i>function</i>, <i>args</i>, ...)</code></td> |
| 744 <td>Declares a function object bound to certain arguments</td> | 744 <td>Declares a function object bound to certain arguments</td> |
| 745 <td>TODO: documentation link</td> | 745 <td><a href="http://en.cppreference.com/w/cpp/utility/functional/bind">std::bind </a></td> |
| 746 <td></td> | 746 <td></td> |
| 747 </tr> | 747 </tr> |
| 748 | 748 |
| 749 <tr> | 749 <tr> |
| 750 <td>C Floating-Point Environment</td> | 750 <td>C Floating-Point Environment</td> |
| 751 <td><code><cfenv></code>, <code><fenv.h></code></td> | 751 <td><code><cfenv></code>, <code><fenv.h></code></td> |
| 752 <td>Provides floating point status flags and control modes for C-compatible code </td> | 752 <td>Provides floating point status flags and control modes for C-compatible code </td> |
| 753 <td><a href="http://en.cppreference.com/w/cpp/header/cfenv">Standard library hea der <cfenv></a></td> | 753 <td><a href="http://en.cppreference.com/w/cpp/header/cfenv">Standard library hea der <cfenv></a></td> |
| 754 <td>Banned in <a href="https://google.github.io/styleguide/cppguide.html#C++11"> Google Style Guide</a> due to concerns about compiler support.</td> | 754 <td>Banned in <a href="https://google.github.io/styleguide/cppguide.html#C++11"> Google Style Guide</a> due to concerns about compiler support.</td> |
| 755 </tr> | 755 </tr> |
| (...skipping 27 matching lines...) Expand all Loading... | |
| 783 <td><code>std::result_of<<i>Functor(ArgTypes...)</i>></code></td> | 783 <td><code>std::result_of<<i>Functor(ArgTypes...)</i>></code></td> |
| 784 <td>Extracts the return type from the type signature of a function call invocati on at compile-time.</td> | 784 <td>Extracts the return type from the type signature of a function call invocati on at compile-time.</td> |
| 785 <td><a href="http://en.cppreference.com/w/cpp/types/result_of">std::result_of</a ></td> | 785 <td><a href="http://en.cppreference.com/w/cpp/types/result_of">std::result_of</a ></td> |
| 786 <td><a href="http://stackoverflow.com/questions/15486951/why-does-stdresult-of-t ake-an-unrelated-function-type-as-a-type-argument">Why does std::result_of take an (unrelated) function type as a type argument?</a></td> | 786 <td><a href="http://stackoverflow.com/questions/15486951/why-does-stdresult-of-t ake-an-unrelated-function-type-as-a-type-argument">Why does std::result_of take an (unrelated) function type as a type argument?</a></td> |
| 787 </tr> | 787 </tr> |
| 788 | 788 |
| 789 <tr> | 789 <tr> |
| 790 <td>Function Objects</td> | 790 <td>Function Objects</td> |
| 791 <td><code>std::function</code></td> | 791 <td><code>std::function</code></td> |
| 792 <td>Wraps a standard polymorphic function</td> | 792 <td>Wraps a standard polymorphic function</td> |
| 793 <td>TODO: documentation link</td> | 793 <td><a href="http://en.cppreference.com/w/cpp/utility/functional/function">std:: function</a></td> |
| 794 <td></td> | 794 <td></td> |
| 795 </tr> | 795 </tr> |
| 796 | 796 |
| 797 <tr> | 797 <tr> |
| 798 <td>Forward Lists</td> | 798 <td>Forward Lists</td> |
| 799 <td><code>std::forward_list</code></td> | 799 <td><code>std::forward_list</code></td> |
| 800 <td>Provides an efficient singly linked list</td> | 800 <td>Provides an efficient singly linked list</td> |
| 801 <td><a href="http://en.cppreference.com/w/cpp/container/forward_list">std::forwa rd_list</a></td> | 801 <td><a href="http://en.cppreference.com/w/cpp/container/forward_list">std::forwa rd_list</a></td> |
| 802 <td></td> | 802 <td></td> |
| 803 </tr> | 803 </tr> |
| (...skipping 43 matching lines...) Expand 10 before | Expand all | Expand 10 after Loading... | |
| 847 <td><code>std::ratio<<i>numerator</i>, <i>denominator</i>></code></td> | 847 <td><code>std::ratio<<i>numerator</i>, <i>denominator</i>></code></td> |
| 848 <td>Provides compile-time rational numbers</td> | 848 <td>Provides compile-time rational numbers</td> |
| 849 <td><a href="http://en.cppreference.com/w/cpp/numeric/ratio/ratio">std::ratio</a ></td> | 849 <td><a href="http://en.cppreference.com/w/cpp/numeric/ratio/ratio">std::ratio</a ></td> |
| 850 <td>Banned in <a href="https://google.github.io/styleguide/cppguide.html#C++11"> Google Style Guide</a> due to concerns that they are tied to a more template-hea vy interface style.</td> | 850 <td>Banned in <a href="https://google.github.io/styleguide/cppguide.html#C++11"> Google Style Guide</a> due to concerns that they are tied to a more template-hea vy interface style.</td> |
| 851 </tr> | 851 </tr> |
| 852 | 852 |
| 853 <tr> | 853 <tr> |
| 854 <td>Reference Wrapper Classes</td> | 854 <td>Reference Wrapper Classes</td> |
| 855 <td><code>std::reference_wrapper</code> and <code>std::ref()</code>, <code>std:: cref()</code></td> | 855 <td><code>std::reference_wrapper</code> and <code>std::ref()</code>, <code>std:: cref()</code></td> |
| 856 <td>Allows you to wrap a reference within a standard object (and use those withi n containers)</td> | 856 <td>Allows you to wrap a reference within a standard object (and use those withi n containers)</td> |
| 857 <td><a href="http://www.informit.com/guides/content.aspx?g=cplusplus&seqNum= 217">Reference Wrappers</a></td> | 857 <td><a href="http://en.cppreference.com/w/cpp/utility/functional/reference_wrapp er">std::reference_wrapper</a></td> |
| 858 <td></td> | 858 <td></td> |
| 859 </tr> | 859 </tr> |
| 860 | 860 |
| 861 <tr> | 861 <tr> |
| 862 <td>Soft Program Exits</td> | 862 <td>Soft Program Exits</td> |
| 863 <td><code>std::at_quick_exit()</code>, <code>std::quick_exit()</code></td> | 863 <td><code>std::at_quick_exit()</code>, <code>std::quick_exit()</code></td> |
| 864 <td>Allows registration of functions to be called upon exit, allowing cleaner pr ogram exit than <code>abort()</code> or <code>exit</code></td> | 864 <td>Allows registration of functions to be called upon exit, allowing cleaner pr ogram exit than <code>abort()</code> or <code>exit</code></td> |
| 865 <td><a href="http://en.cppreference.com/w/cpp/utility/program/quick_exit">std:qu ick_exit</a></td> | 865 <td><a href="http://en.cppreference.com/w/cpp/utility/program/quick_exit">std:qu ick_exit</a></td> |
| 866 <td></td> | 866 <td></td> |
| 867 </tr> | 867 </tr> |
| 868 | 868 |
| 869 <tr> | 869 <tr> |
| 870 <td>String-Number Conversion Functions</td> | 870 <td>String-Number Conversion Functions</td> |
| 871 <td><code>std::stoi()</code>, <code>std::stol()</code>, <code>std::stoul()</code >, <code>std::stoll</code>, <code>std::stoull()</code>, <code>std::stof()</code> , <code>std::stod()</code>, <code>std::stold()</code>, <code>std::to_string()</c ode></td> | 871 <td><code>std::stoi()</code>, <code>std::stol()</code>, <code>std::stoul()</code >, <code>std::stoll</code>, <code>std::stoull()</code>, <code>std::stof()</code> , <code>std::stod()</code>, <code>std::stold()</code>, <code>std::to_string()</c ode></td> |
| 872 <td>Converts strings to/from numbers</td> | 872 <td>Converts strings to/from numbers</td> |
| 873 <td><a href="http://en.cppreference.com/w/cpp/string/basic_string/stol">std::sto i, std::stol, std::stoll</a>, <a href="http://en.cppreference.com/w/cpp/string/b asic_string/stoul">std::stoul, std::stoull</a>, <a href="http://en.cppreference. com/w/cpp/string/basic_string/stof">std::stof, std::stod, std::stold</a>, <a hre f="http://en.cppreference.com/w/cpp/string/basic_string/to_string">std::to_strin g</a></td> | 873 <td><a href="http://en.cppreference.com/w/cpp/string/basic_string/stol">std::sto i, std::stol, std::stoll</a>, <a href="http://en.cppreference.com/w/cpp/string/b asic_string/stoul">std::stoul, std::stoull</a>, <a href="http://en.cppreference. com/w/cpp/string/basic_string/stof">std::stof, std::stod, std::stold</a>, <a hre f="http://en.cppreference.com/w/cpp/string/basic_string/to_string">std::to_strin g</a></td> |
| 874 <td></td> | 874 <td></td> |
| 875 </tr> | 875 </tr> |
| 876 | 876 |
| 877 <tr> | 877 <tr> |
| 878 <td>System Errors</td> | 878 <td>System Errors</td> |
| 879 <td><code><system_error></code></td> | 879 <td><code><system_error></code></td> |
| 880 <td>Provides a standard system error library</td> | 880 <td>Provides a standard system error library</td> |
| 881 <td><a href="http://en.cppreference.com/w/cpp/error/system_error">std::system_er ror</a></td> | 881 <td><a href="http://en.cppreference.com/w/cpp/header/system_error">Standard libr ary header <system_error></a></td> |
| 882 <td></td> | 882 <td></td> |
| 883 </tr> | 883 </tr> |
| 884 | 884 |
| 885 <tr> | 885 <tr> |
| 886 <td>Type-Generic Math Functions</td> | 886 <td>Type-Generic Math Functions</td> |
| 887 <td>Functions within <code><ctgmath></code></td> | 887 <td><code><ctgmath></code></td> |
| 888 <td>Provides a means to call real or complex functions based on the type of argu ments</td> | 888 <td>Provides a means to call real or complex functions based on the type of argu ments</td> |
| 889 <td><a href="http://en.cppreference.com/w/cpp/header/ctgmath">Standard library h eader <ctgmath></a></td> | 889 <td><a href="http://en.cppreference.com/w/cpp/header/ctgmath">Standard library h eader <ctgmath></a></td> |
| 890 <td></td> | 890 <td></td> |
| 891 </tr> | 891 </tr> |
| 892 | 892 |
| 893 <tr> | 893 <tr> |
| 894 <td>Type Info Enhancements</td> | 894 <td>Type Info Enhancements</td> |
| 895 <td><code>std::type_index</code>, <code>std::type_info::hash_code()</code></td> | 895 <td><code>std::type_index</code>, <code>std::type_info::hash_code()</code></td> |
| 896 <td>Allows type information (most often within containers) that can be copied, a ssigned, or hashed</td> | 896 <td>Allows type information (most often within containers) that can be copied, a ssigned, or hashed</td> |
| 897 <td><a href="http://en.cppreference.com/w/cpp/types/type_index">std::type_index< /a>, <a href="http://en.cppreference.com/w/cpp/types/type_info/hash_code">std::t ype_info::hash_code</a></td> | 897 <td><a href="http://en.cppreference.com/w/cpp/types/type_index">std::type_index< /a>, <a href="http://en.cppreference.com/w/cpp/types/type_info/hash_code">std::t ype_info::hash_code</a></td> |
| 898 <td><code>std::type_index</code> is a thin wrapper for <code>std::type_info</cod e>, allowing you to use it directly within both associative and unordered contai ners</td> | 898 <td><code>std::type_index</code> is a thin wrapper for <code>std::type_info</cod e>, allowing you to use it directly within both associative and unordered contai ners</td> |
| 899 </tr> | 899 </tr> |
| 900 | 900 |
| 901 <tr> | 901 <tr> |
| 902 <td>Variadic Copy Macro</td> | 902 <td>Variadic Copy Macro</td> |
| 903 <td><code>va_copy(va_list <i>dest</i>, va_list <i>src</i>)</code></td> | 903 <td><code>va_copy(va_list <i>dest</i>, va_list <i>src</i>)</code></td> |
| 904 <td>Makes a copy of the variadic function arguments</td> | 904 <td>Makes a copy of the variadic function arguments</td> |
| 905 <td></td> | 905 <td><a href="http://en.cppreference.com/w/cpp/utility/variadic/va_copy">va_copy< /a></td> |
| 906 <td></td> | 906 <td></td> |
| 907 </tr> | 907 </tr> |
| 908 | 908 |
| 909 <tr> | 909 <tr> |
| 910 <td>Weak Pointers</td> | 910 <td>Weak Pointers</td> |
| 911 <td><code>std::weak_ptr</code></td> | 911 <td><code>std::weak_ptr</code></td> |
| 912 <td>Allows a weak reference to a <code>std::shared_ptr</code></td> | 912 <td>Allows a weak reference to a <code>std::shared_ptr</code></td> |
| 913 <td><a href="http://en.cppreference.com/w/cpp/memory/weak_ptr">std::weak_ptr</a> </td> | 913 <td><a href="http://en.cppreference.com/w/cpp/memory/weak_ptr">std::weak_ptr</a> </td> |
| 914 <td><a href="https://google.github.io/styleguide/cppguide.html#Ownership_and_Sma rt_Pointers">Ownership and Smart Pointers</a></td> | 914 <td><a href="https://google.github.io/styleguide/cppguide.html#Ownership_and_Sma rt_Pointers">Ownership and Smart Pointers</a></td> |
| 915 </tr> | 915 </tr> |
| 916 | 916 |
| 917 <tr> | 917 <tr> |
| 918 <td>Wide String Support</td> | 918 <td>Wide String Support</td> |
| 919 <td><code>std::wstring_convert</code>, <code>std::wbuffer_convert</code><br /> | 919 <td><code>std::wstring_convert</code>, <code>std::wbuffer_convert</code><br /> |
| 920 <code>std::codecvt_utf8</code>, <code>std::codecvt_utf16</code>, <code>std::code cvt_utf8_utf16</code></td> | 920 <code>std::codecvt_utf8</code>, <code>std::codecvt_utf16</code>, <code>std::code cvt_utf8_utf16</code></td> |
| 921 <td>Converts between string encodings</td> | 921 <td>Converts between string encodings</td> |
| 922 <td><a href="http://en.cppreference.com/w/cpp/locale/wstring_convert">std::wstri ng_convert</a>, <a href="http://en.cppreference.com/w/cpp/locale/wbuffer_convert ">std::wbuffer_convert</a>, <a href="http://en.cppreference.com/w/cpp/locale/cod ecvt_utf8">std::codecvt_utf8</a>, <a href="http://en.cppreference.com/w/cpp/loca le/codecvt_utf16">std::codecvt_utf16</a>, <a href="http://en.cppreference.com/w/ cpp/locale/codecvt_utf8_utf16">std::codecvt_utf8_utf16</a></td> | 922 <td><a href="http://en.cppreference.com/w/cpp/locale/wstring_convert">std::wstri ng_convert</a>, <a href="http://en.cppreference.com/w/cpp/locale/wbuffer_convert ">std::wbuffer_convert</a>, <a href="http://en.cppreference.com/w/cpp/locale/cod ecvt_utf8">std::codecvt_utf8</a>, <a href="http://en.cppreference.com/w/cpp/loca le/codecvt_utf16">std::codecvt_utf16</a>, <a href="http://en.cppreference.com/w/ cpp/locale/codecvt_utf8_utf16">std::codecvt_utf8_utf16</a></td> |
| 923 <td>Non-UTF-8 text is banned by the <a href="https://google.github.io/styleguide /cppguide.html#Non-ASCII_Characters">Google Style Guide</a>. However, may be use ful for consuming non-ASCII data.</td> | 923 <td>Non-UTF-8 text is banned by the <a href="https://google.github.io/styleguide /cppguide.html#Non-ASCII_Characters">Google Style Guide</a>. However, may be use ful for consuming non-ASCII data.</td> |
| 924 </tr> | 924 </tr> |
| 925 | 925 |
| 926 </tbody> | 926 </tbody> |
| 927 </table> | 927 </table> |
| 928 | 928 |
| 929 </div> | 929 </div> |
| 930 </body> | 930 </body> |
| 931 </html> | 931 </html> |
| OLD | NEW |
