styleguide/c++/c++11.html - Issue 1885183002: Allow constexpr, and use it in a few places.

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Issue 1885183002: Allow constexpr, and use it in a few places. (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master

Patch Set: Add guidance Created 4 years, 8 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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103 <td><code>auto</code></td>	103 <td><code>auto</code></td>

104 <td>Automatic type deduction</td>	104 <td>Automatic type deduction</td>

105 <td><a href="http://en.cppreference.com/w/cpp/language/auto">	105 <td><a href="http://en.cppreference.com/w/cpp/language/auto">

106 auto specifier</a></td>	106 auto specifier</a></td>

107 <td>Use according to the <a	107 <td>Use according to the <a

108 href="https://google.github.io/styleguide/cppguide.html#auto">Google	108 href="https://google.github.io/styleguide/cppguide.html#auto">Google

109 Style Guide on <code>auto</code></a>. <a href="https://groups.google.com/a/chrom ium.org/forum/#!topic/chromium-dev/OQyYSfH9m2M">Discussion thread</a>. <a href=" https://groups.google.com/a/chromium.org/forum/#!topic/chromium-dev/5-Bt3BJzAo0" >Another discussion thread</a>.</td>	109 Style Guide on <code>auto</code></a>. <a href="https://groups.google.com/a/chrom ium.org/forum/#!topic/chromium-dev/OQyYSfH9m2M">Discussion thread</a>. <a href=" https://groups.google.com/a/chromium.org/forum/#!topic/chromium-dev/5-Bt3BJzAo0" >Another discussion thread</a>.</td>

110 </tr>	110 </tr>

111	111

112 <tr>	112 <tr>

	113 <td>Constant Expressions</td>

	114 <td><code>constexpr</code></td>

	115 <td>Compile-time constant expressions</td>

	116 <td><a href="http://en.cppreference.com/w/cpp/language/constexpr">constexpr spec ifier</a></td>

	117 <td>Prefer to <code>const</code> for variables where possible. Use cautiously on functions. Don't go out of the way to convert existing code. <a href="https://g oogle.github.io/styleguide/cppguide.html#Use_of_constexpr">Google Style Guide</a ></td>

	118 </tr>

	119

	120 <tr>

113 <td>Declared Type Accessor</td>	121 <td>Declared Type Accessor</td>

114 <td><code>decltype(<i>expression</i>)</code></td>	122 <td><code>decltype(<i>expression</i>)</code></td>

115 <td>Provides a means to determine the type of an expression at compile-time,	123 <td>Provides a means to determine the type of an expression at compile-time,

116 useful most often in templates.</td>	124 useful most often in templates.</td>

117 <td><a href="http://en.cppreference.com/w/cpp/language/decltype">	125 <td><a href="http://en.cppreference.com/w/cpp/language/decltype">

118 decltype specifier</a></td>	126 decltype specifier</a></td>

119 <td>Usage should be rare. <a href="https://groups.google.com/a/chromium.org/foru m/#!topic/chromium-dev/_zoNvZd_dSo">Discussion thread</a></td>	127 <td>Usage should be rare. <a href="https://groups.google.com/a/chromium.org/foru m/#!topic/chromium-dev/_zoNvZd_dSo">Discussion thread</a></td>

120 </tr>	128 </tr>

121	129

122 <tr>	130 <tr>

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543 <td>	551 <td>

544 <a href="https://codereview.chromium.org/1497963002/">Doesn't work in	552 <a href="https://codereview.chromium.org/1497963002/">Doesn't work in

545 MSVS2013</a>.	553 MSVS2013</a>.

546 <a href="https://msdn.microsoft.com/en-us/library/dn956970.aspx">MSVS2015	554 <a href="https://msdn.microsoft.com/en-us/library/dn956970.aspx">MSVS2015

547 supports them</a>; reevaluate after MSVS2015 is available.	555 supports them</a>; reevaluate after MSVS2015 is available.

548 <a href="https://groups.google.com/a/chromium.org/d/msg/cxx/rwXN02jzzq0/CpUc1ZzM BQAJ">Discussion thread</a>	556 <a href="https://groups.google.com/a/chromium.org/d/msg/cxx/rwXN02jzzq0/CpUc1ZzM BQAJ">Discussion thread</a>

549 </td>	557 </td>

550 </tr>	558 </tr>

551	559

552 <tr>	560 <tr>

553 <td>Constant Expressions</td>

554 <td><code>constexpr</code></td>

555 <td>Compile-time constant expressions</td>

556 <td><a href="http://en.cppreference.com/w/cpp/language/constexpr">

557 constexpr specifier</a></td>

558 <td>Doesn't work in MSVS2013. Reevalute once it does. <a

559 href="https://google.github.io/styleguide/cppguide.html#Use_of_constexpr">Google

560 Style Guide on <code>constexpr</code></a></td>

561 </tr>

562

563 <tr>

564 <td>Function Local Variable</td>	561 <td>Function Local Variable</td>

565 <td><code>__func__</code></td>	562 <td><code>__func__</code></td>

566 <td>Provides a local variable of the name of the enclosing	563 <td>Provides a local variable of the name of the enclosing

567 function for logging purposes</td>	564 function for logging purposes</td>

568 <td><a href="http://www.informit.com/guides/content.aspx?g=cplusplus&seqNum= 338">	565 <td><a href="http://www.informit.com/guides/content.aspx?g=cplusplus&seqNum= 338">

569 The __func__ Predeclared Identifier is Coming to C++</a></td>	566 The __func__ Predeclared Identifier is Coming to C++</a></td>

570 <td>Doesn't work in MSVS2013. Reevaluate once it does. <a href="https://groups.g oogle.com/a/chromium.org/forum/#!topic/chromium-dev/ojGfcgSDzHM">Discussion thre ad</a></td>	567 <td>Doesn't work in MSVS2013. Reevaluate once it does. <a href="https://groups.g oogle.com/a/chromium.org/forum/#!topic/chromium-dev/ojGfcgSDzHM">Discussion thre ad</a></td>

571 </tr>	568 </tr>

572	569

573 <tr>	570 <tr>

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1108 C++ Style Guide</a>. However, may be useful for	1105 C++ Style Guide</a>. However, may be useful for

1109 consuming non-ASCII data.</td>	1106 consuming non-ASCII data.</td>

1110 </tr>	1107 </tr>

1111	1108

1112 </tbody>	1109 </tbody>

1113 </table>	1110 </table>

1114	1111

1115 </div>	1112 </div>

1116 </body>	1113 </body>

1117 </html>	1114 </html>

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