styleguide/c++/c++11.html - Issue 2080003002: base::Optional: Use anonymous union instead of base::AlignedMemory

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Issue 2080003002: base::Optional: Use anonymous union instead of base::AlignedMemory (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master

Patch Set: rebase Created 4 years, 4 months ago

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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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280	280

281 <tr>	281 <tr>

282 <td>Uniform Initialization Syntax</td>	282 <td>Uniform Initialization Syntax</td>

283 <td><code><i>type</i> <i>name</i> {[<i>value</i> ..., <i>value</i>]};</code></td >	283 <td><code><i>type</i> <i>name</i> {[<i>value</i> ..., <i>value</i>]};</code></td >

284 <td>Allows any object of primitive, aggregate or class type to be initialized us ing brace syntax</td>	284 <td>Allows any object of primitive, aggregate or class type to be initialized us ing brace syntax</td>

285 <td><a href="http://www.stroustrup.com/C++11FAQ.html#uniform-init">Uniform initi alization syntax and semantics</a></td>	285 <td><a href="http://www.stroustrup.com/C++11FAQ.html#uniform-init">Uniform initi alization syntax and semantics</a></td>

286 <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>	286 <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 </tr>	287 </tr>

288	288

289 <tr>	289 <tr>

	290 <td>Union Class Members</td>

	291 <td><code>union <i>name</i> {<i>class</i> <i>var</i>}</code></td>

	292 <td>Allows class type members</td>

	293 <td><a href="http://en.cppreference.com/w/cpp/language/union">Union declarations </a></td>

	294 <td>Usage should be rare.</td>

	295 </tr>

	296

	297 <tr>

290 <td>Variadic Macros</td>	298 <td>Variadic Macros</td>

291 <td><code>#define <i>MACRO</i>(...) <i>Impl</i>(<i>args</i>, __VA_ARGS__)</code> </td>	299 <td><code>#define <i>MACRO</i>(...) <i>Impl</i>(<i>args</i>, __VA_ARGS__)</code> </td>

292 <td>Allows macros that accept a variable number of arguments</td>	300 <td>Allows macros that accept a variable number of arguments</td>

293 <td><a href="http://stackoverflow.com/questions/4786649/are-variadic-macros-nons tandard">Are Variadic macros nonstandard?</a></td>	301 <td><a href="http://stackoverflow.com/questions/4786649/are-variadic-macros-nons tandard">Are Variadic macros nonstandard?</a></td>

294 <td>Usage should be rare. <a href="https://groups.google.com/a/chromium.org/foru m/#!topic/chromium-dev/sRx9j3CQqyA">Discussion thread</a></td>	302 <td>Usage should be rare. <a href="https://groups.google.com/a/chromium.org/foru m/#!topic/chromium-dev/sRx9j3CQqyA">Discussion thread</a></td>

295 </tr>	303 </tr>

296	304

297 <tr>	305 <tr>

298 <td>Variadic Templates</td>	306 <td>Variadic Templates</td>

299 <td><code>template <<i>typename</i> ... <i>arg</i>></code></td>	307 <td><code>template <<i>typename</i> ... <i>arg</i>></code></td>

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672	680

673 <tr>	681 <tr>

674 <td>Inline Namespaces</td>	682 <td>Inline Namespaces</td>

675 <td><code>inline</code></td>	683 <td><code>inline</code></td>

676 <td>Allows better versioning of namespaces</td>	684 <td>Allows better versioning of namespaces</td>

677 <td><a href="http://en.cppreference.com/w/cpp/language/namespace">Namespaces</a> </td>	685 <td><a href="http://en.cppreference.com/w/cpp/language/namespace">Namespaces</a> </td>

678 <td>Unclear how it will work with components</td>	686 <td>Unclear how it will work with components</td>

679 </tr>	687 </tr>

680	688

681 <tr>	689 <tr>

682 <td>Union Class Members</td>

683 <td><code>union <i>name</i> {<i>class</i> <i>var</i>}</code></td>

684 <td>Allows class type members</td>

685 <td><a href="http://en.cppreference.com/w/cpp/language/union">Union declarations </a></td>

686 <td></td>

687 </tr>

688

689 <tr>

690 <td>User-Defined Literals</td>	690 <td>User-Defined Literals</td>

691 <td><code><i>type</i> <i>var</i> = <i>literal_value</i>_<i>type</i></code></td>	691 <td><code><i>type</i> <i>var</i> = <i>literal_value</i>_<i>type</i></code></td>

692 <td>Allows user-defined literal expressions</td>	692 <td>Allows user-defined literal expressions</td>

693 <td><a href="http://en.cppreference.com/w/cpp/language/user_literal">User-define d literals</a></td>	693 <td><a href="http://en.cppreference.com/w/cpp/language/user_literal">User-define d literals</a></td>

694 <td></td>	694 <td></td>

695 </tr>	695 </tr>

696	696

697 </tbody>	697 </tbody>

698 </table>	698 </table>

699	699

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921 <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>	921 <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>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>	922 <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 </tr>	923 </tr>

924	924

925 </tbody>	925 </tbody>

926 </table>	926 </table>

927	927

928 </div>	928 </div>

929 </body>	929 </body>

930 </html>	930 </html>

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