1072 lines
35 KiB
XML
1072 lines
35 KiB
XML
<section xmlns="http://docbook.org/ns/docbook" version="5.0"
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xml:id="status.iso.2017" xreflabel="Status C++ 2017">
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<?dbhtml filename="status_iso_cxx2017.html"?>
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<info><title>C++ 2017</title>
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<keywordset>
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<keyword>ISO C++</keyword>
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<keyword>2017</keyword>
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</keywordset>
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</info>
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<para>
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In this implementation the <literal>-std=gnu++17</literal> or
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<literal>-std=c++17</literal> flag must be used to enable language
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and library
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features. See <link linkend="manual.intro.using.flags">dialect</link>
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options. The pre-defined symbol
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<constant>__cplusplus</constant> is used to check for the
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presence of the required flag.
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</para>
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<para>
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This section describes the C++17 and library TS support in the GCC 7 series.
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</para>
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<para>
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The following table lists new library features that have been accepted into
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the C++17 working draft. The "Proposal" column provides a link to the
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ISO C++ committee proposal that describes the feature, while the "Status"
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column indicates the first version of GCC that contains an implementation of
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this feature (if it has been implemented).
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The "SD-6 Feature Test" column shows the corresponding macro or header from
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<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="https://isocpp.org/std/standing-documents/sd-6-sg10-feature-test-recommendations">SD-6:
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Feature-testing recommendations for C++</link>.
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</para>
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<table frame="all" xml:id="table.cxx17_status">
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<title>C++ 2017 Implementation Status</title>
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<tgroup cols="4" align="left" colsep="0" rowsep="1">
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<colspec colname="c1"/>
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<colspec colname="c2"/>
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<colspec colname="c3"/>
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<colspec colname="c4"/>
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<thead>
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<row>
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<entry>Library Feature</entry>
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<entry>Proposal</entry>
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<entry>Status</entry>
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<entry>SD-6 Feature Test</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<?dbhtml bgcolor="#C8B0B0" ?>
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<entry>
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<code>constexpr std::hardware_{constructive,destructive}_interference_size</code>
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</entry>
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<entry>
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<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0154r1.html">
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P0154R1
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</link>
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</entry>
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<entry align="center"> No </entry>
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<entry> <code>__cpp_lib_hardware_interference_size >= 201603</code> </entry>
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</row>
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<row>
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<entry> Core Issue 1776: Replacement of class objects containing reference members</entry>
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<entry>
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<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0137r1.html">
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P0137R1
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</link>
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</entry>
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<entry align="center"> 7.1 </entry>
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<entry> <code>__cpp_lib_launder >= 201606</code> </entry>
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</row>
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<row>
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<entry>Wording for <code>std::uncaught_exceptions</code></entry>
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<entry>
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<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/JTC1/sc22/WG21/docs/papers/2014/n4259.pdf">
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N4259
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</link>
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</entry>
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<entry align="center">6.1</entry>
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<entry><code>__cpp_lib_uncaught_exceptions >= 201411</code></entry>
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</row>
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<row>
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<entry> Variant: a type-safe union for C++17 </entry>
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<entry>
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<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0088r3.html">
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P0088R3
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</link>
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</entry>
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<entry align="center"> 7.1 </entry>
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<entry> <code>__has_include(<variant>)</code>,
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<code>__cpp_lib_variant >= 201603</code>
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(since 7.3, see Note 1)
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</entry>
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</row>
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<row>
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<entry> Library Fundamentals V1 TS Components: <code>optional</code> </entry>
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<entry>
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<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0220r1.html">
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P0220R1
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</link>
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</entry>
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<entry align="center"> 7.1 </entry>
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<entry> <code>__has_include(<optional>)</code>,
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<code>__cpp_lib_optional >= 201603</code>
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(since 7.3, see Note 1)
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</entry>
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</row>
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<row>
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<entry> Library Fundamentals V1 TS Components: <code>any</code> </entry>
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<entry>
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<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0220r1.html">
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P0220R1
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</link>
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</entry>
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<entry align="center"> 7.1 </entry>
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<entry> <code>__has_include(<any>)</code>,
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<code>__cpp_lib_any >= 201603</code>
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(since 7.3, see Note 1)
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</entry>
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</row>
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<row>
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<entry> Library Fundamentals V1 TS Components: <code>string_view</code> </entry>
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<entry>
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<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0220r1.html">
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P0220R1
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</link>
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</entry>
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<entry align="center"> 7.1 </entry>
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<entry> <code>__has_include(<string_view>)</code>,
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<code>__cpp_lib_string_view >= 201603</code>
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(since 7.3, see Note 1)
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</entry>
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</row>
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<row>
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<?dbhtml bgcolor="#C8B0B0" ?>
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<entry> Library Fundamentals V1 TS Components: <code>memory_resource</code> </entry>
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<entry>
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<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0220r1.html">
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P0220R1
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</link>
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</entry>
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<entry align="center"> No </entry>
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<entry> <code>__has_include(<memory_resource>)</code>,
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<code>__cpp_lib_memory_resource >= 201603</code>
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</entry>
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</row>
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<row>
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<entry> Library Fundamentals V1 TS Components: <code>apply</code> </entry>
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<entry>
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<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0220r1.html">
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P0220R1
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</link>
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</entry>
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<entry align="center"> 7.1 </entry>
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<entry> <code>__cpp_lib_apply >= 201603</code> </entry>
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</row>
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<row>
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<entry> Library Fundamentals V1 TS Components: <code>shared_ptr<T[]></code> </entry>
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<entry>
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<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0220r1.html">
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P0220R1
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</link>
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</entry>
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<entry align="center"> 7.1 </entry>
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<entry> <code>__cpp_lib_shared_ptr_arrays >= 201603</code> </entry>
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</row>
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<row>
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<entry> Library Fundamentals V1 TS Components: Searchers </entry>
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<entry>
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<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0220r1.html">
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P0220R1
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</link>
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</entry>
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<entry align="center"> 7.1 </entry>
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<entry> <code>__cpp_lib_boyer_moore_searcher >= 201603</code> </entry>
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</row>
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<row>
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<entry> Library Fundamentals V1 TS Components: Sampling </entry>
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<entry>
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<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0220r1.html">
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P0220R1
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</link>
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</entry>
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<entry align="center"> 7.1 </entry>
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<entry> <code>__cpp_lib_sample >= 201603</code> </entry>
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</row>
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<row>
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<entry> Constant View: A proposal for a <code>std::as_const</code> helper function template </entry>
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<entry>
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<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="">
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P0007R1
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</link>
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</entry>
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<entry align="center"> 7.1 </entry>
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<entry><code> __cpp_lib_as_const >= 201510 </code></entry>
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</row>
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<row>
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<entry> Improving pair and tuple </entry>
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<entry>
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<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4387">
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N4387
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</link>
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</entry>
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<entry align="center"> 6.1 </entry>
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<entry> N/A </entry>
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</row>
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<row>
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<entry> <code>make_from_tuple</code>: apply for construction </entry>
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<entry>
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<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0209r2.pdf">
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P0209R2
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</link>
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</entry>
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<entry align="center"> 7.1 </entry>
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<entry><code> __cpp_lib_make_from_tuple >= 201606 </code></entry>
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</row>
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<row>
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<?dbhtml bgcolor="#C8B0B0" ?>
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<entry>
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Removing <code>auto_ptr</code>, <code>random_shuffle()</code>,
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And Old <code><functional></code> Stuff
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</entry>
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<entry>
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<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4190.htm">
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N4190
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</link>
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</entry>
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<entry align="center">No (kept for backwards compatibility)</entry>
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<entry/>
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</row>
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<row>
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<?dbhtml bgcolor="#C8B0B0" ?>
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<entry> Deprecating Vestigial Library Parts in C++17 </entry>
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<entry>
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<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0174r2.html">
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P0174R2
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</link>
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</entry>
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<entry align="center"> No </entry>
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<entry/>
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</row>
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<row>
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<entry> Making <code>std::owner_less</code> more flexible </entry>
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<entry>
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<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0074r0.html">
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P0074R0
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</link>
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</entry>
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<entry align="center"> 7.1 </entry>
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<entry><code> __cpp_lib_transparent_operators >= 201510 </code></entry>
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</row>
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<row>
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<entry> <code>std::addressof</code> should be constexpr </entry>
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<entry>
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<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0304r0.html#2296">
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LWG2296
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</link>
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</entry>
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<entry align="center"> 7.1 </entry>
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<entry><code> __cpp_lib_addressof_constexpr >= 201603 </code></entry>
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</row>
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<row>
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<entry> Safe conversions in <code>unique_ptr<T[]></code> </entry>
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<entry>
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<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4089.pdf">
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N4089
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</link>
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</entry>
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<entry align="center"> 6 </entry>
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<entry/>
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</row>
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<row>
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<entry> LWG 2228: Missing SFINAE rule in unique_ptr templated assignment </entry>
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<entry>
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<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4366.html">
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N4366
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</link>
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</entry>
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<entry align="center"> 6 </entry>
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<entry/>
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</row>
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<row>
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<entry> Re-enabling <code>shared_from_this</code></entry>
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<entry>
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<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0033r1.html">
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P0033R1
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</link>
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</entry>
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<entry align="center"> 7.1 </entry>
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<entry><code>__cpp_lib_enable_shared_from_this >= 201603</code></entry>
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</row>
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<row>
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<entry> A proposal to add <code>invoke</code> function template </entry>
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<entry>
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<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4169.html">
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N4169
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</link>
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</entry>
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<entry align="center"> 6.1 </entry>
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<entry><code> __cpp_lib_invoke >= 201411 </code></entry>
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</row>
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<row>
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<entry>TriviallyCopyable <code>reference_wrapper</code> </entry>
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<entry>
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<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4277.html">
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N4277
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</link>
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</entry>
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<entry align="center"> 5.1 </entry>
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<entry/>
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</row>
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<row>
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<entry> Adopt <code>not_fn</code> from Library Fundamentals 2 for C++17 </entry>
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<entry>
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<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0005r4.html">
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P0005R4
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</link>
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</entry>
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<entry align="center"> 7.1 </entry>
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<entry><code>__cpp_lib_not_fn >= 201603</code></entry>
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</row>
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<row>
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<entry> Fixes for <code>not_fn</code> </entry>
|
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<entry>
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<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0358r1.html">
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P0358R1
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</link>
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</entry>
|
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<entry align="center"> 7.1 </entry>
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<entry/>
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</row>
|
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|
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<row>
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<entry> Fixing a design mistake in the searchers interface in Library Fundamentals </entry>
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<entry>
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<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0253r1.pdf">
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P0253R1
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</link>
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</entry>
|
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<entry align="center"> 7.1 </entry>
|
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<entry/>
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</row>
|
|
|
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<row>
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<entry> Extending memory management tools </entry>
|
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<entry>
|
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<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0040r3.html">
|
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P0040R3
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</link>
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</entry>
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<entry align="center"> 7.1 </entry>
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<entry><code> </code></entry>
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</row>
|
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|
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<row>
|
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<entry> <code>shared_ptr::weak_type</code></entry>
|
|
<entry>
|
|
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0163r0.html">
|
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P0163R0
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</link>
|
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</entry>
|
|
<entry align="center"> 7.1 </entry>
|
|
<entry><code> __cpp_lib_shared_ptr_weak_type >= 201606</code></entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry>Transformation Trait Alias <code>void_t</code></entry>
|
|
<entry>
|
|
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/JTC1/sc22/WG21/docs/papers/2014/n3911.pdf">
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N3911
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</link>
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</entry>
|
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<entry align="center">6.1</entry>
|
|
<entry><code> __cpp_lib_void_t >= 201411</code></entry>
|
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</row>
|
|
|
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<row>
|
|
<entry> Wording for <code>bool_constant</code>, revision 1 </entry>
|
|
<entry>
|
|
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4389.html">
|
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N4389
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</link>
|
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</entry>
|
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<entry align="center">6.1</entry>
|
|
<entry><code> __cpp_lib_bool_constant >= 201505</code></entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry> Adopt Type Traits Variable Templates from Library Fundamentals TS for C++17</entry>
|
|
<entry>
|
|
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0006r0.html">
|
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P0006R0
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</link>
|
|
</entry>
|
|
<entry align="center"> 7.1 </entry>
|
|
<entry><code> __cpp_lib_type_trait_variable_templates >= 201510 </code></entry>
|
|
</row>
|
|
|
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<row>
|
|
<entry> Logical Operator Type Traits</entry>
|
|
<entry>
|
|
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0013r1.html">
|
|
P0013R1
|
|
</link>
|
|
</entry>
|
|
<entry align="center"> 6.1 </entry>
|
|
<entry><code> __cpp_lib_logical_traits >= 201510 </code></entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry> Adding [nothrow-]swappable traits </entry>
|
|
<entry>
|
|
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0185r1.html">
|
|
P0185R1
|
|
</link>
|
|
</entry>
|
|
<entry align="center"> 7 (<code>__is_swappable</code> available since 6.1)</entry>
|
|
<entry><code> __cpp_lib_is_swappable >= 201603 </code></entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry> <code>is_callable</code>, the missing INVOKE related trait</entry>
|
|
<entry>
|
|
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0077r2.html">
|
|
P0077R2
|
|
</link>
|
|
</entry>
|
|
<entry align="center"> 7.1 </entry>
|
|
<entry><code> __cpp_lib_is_callable >= 201603 </code></entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry> has_unique_object_representations </entry>
|
|
<entry>
|
|
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0258r2.html">
|
|
P0258R2
|
|
</link>
|
|
</entry>
|
|
<entry align="center"> 7.1 </entry>
|
|
<entry><code> __cpp_lib_has_unique_object_representations >= 201606 </code></entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry> Polishing <code><chrono></code> </entry>
|
|
<entry>
|
|
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0092r1.html">
|
|
P0092R1
|
|
</link>
|
|
</entry>
|
|
<entry align="center"> 7.1 </entry>
|
|
<entry><code> __cpp_lib_chrono >= 201510 </code></entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry> Adding more constexpr to <code><chrono></code> </entry>
|
|
<entry>
|
|
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0505r0.html">
|
|
P0505R0
|
|
</link>
|
|
</entry>
|
|
<entry align="center"> 7.1 </entry>
|
|
<entry><code> __cpp_lib_chrono >= 201611 </code>
|
|
(since 7.3, see Note 2)
|
|
</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry> Constexpr for <code>std::char_traits</code> </entry>
|
|
<entry>
|
|
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0426r1.html">
|
|
P0426R1
|
|
</link>
|
|
</entry>
|
|
<entry align="center"> 7.3 </entry>
|
|
<entry><code> __cpp_lib_constexpr_char_traits >= 201611 </code></entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry> Integrating <code>std::string_view</code> and <code>std::string</code> </entry>
|
|
<entry>
|
|
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0254r2.pdf">
|
|
P0254R2
|
|
</link>
|
|
</entry>
|
|
<entry align="center"> 7.1 </entry>
|
|
<entry><code> </code></entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry> Give 'std::string' a non-const '.data()' member function </entry>
|
|
<entry>
|
|
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0272r1.html">
|
|
P0272R1
|
|
</link>
|
|
</entry>
|
|
<entry align="center"> 7.1 </entry>
|
|
<entry><code> </code></entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry>Cleaning-up noexcept in the Library</entry>
|
|
<entry>
|
|
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4258.pdf">
|
|
N4258
|
|
</link>
|
|
</entry>
|
|
<entry align="center">6.1</entry>
|
|
<entry><code> __cpp_lib_allocator_traits_is_always_equal >= 201411 </code></entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry>Contiguous Iterators </entry>
|
|
<entry>
|
|
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4284.html">
|
|
N4284
|
|
</link>
|
|
</entry>
|
|
<entry align="center">N/A</entry>
|
|
<entry/>
|
|
</row>
|
|
|
|
<row>
|
|
<entry> Minimal incomplete type support for standard containers </entry>
|
|
<entry>
|
|
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4510.html">
|
|
N4510
|
|
</link>
|
|
</entry>
|
|
<entry align="center"> 3.0 </entry>
|
|
<entry><code> __cpp_lib_incomplete_container_elements >= 201505 </code>
|
|
(since 6.2, see Note 2)
|
|
</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry> Emplace return type </entry>
|
|
<entry>
|
|
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0084r2.pdf">
|
|
P0084R2
|
|
</link>
|
|
</entry>
|
|
<entry align="center"> 7.1 </entry>
|
|
<entry/>
|
|
</row>
|
|
|
|
<row>
|
|
<entry>Improved insertion interface for unique-key maps</entry>
|
|
<entry>
|
|
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4279.html">
|
|
N4279
|
|
</link>
|
|
</entry>
|
|
<entry align="center"> 6.1 </entry>
|
|
<entry><code> __cpp_lib_map_try_emplace >= 201411</code>,
|
|
<code> __cpp_lib_unordered_map_try_emplace >= 201411</code>
|
|
</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry> Splicing Maps and Sets </entry>
|
|
<entry>
|
|
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0083r3.pdf">
|
|
P0083R3
|
|
</link>
|
|
</entry>
|
|
<entry align="center"> 7.1 </entry>
|
|
<entry><code> __cpp_lib_node_extract >= 201606 </code></entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry>Non-member <code>size()</code> and more</entry>
|
|
<entry>
|
|
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4280.pdf">
|
|
N4280
|
|
</link>
|
|
</entry>
|
|
<entry align="center"> 6.1 </entry>
|
|
<entry><code> __cpp_lib_nonmember_container_access >= 201411 </code></entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry> A Proposal to Add Constexpr Modifiers to <code>reverse_iterator</code>, <code>move_iterator</code>, <code>array</code> and Range Access </entry>
|
|
<entry>
|
|
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0031r0.html">
|
|
P0031R0
|
|
</link>
|
|
</entry>
|
|
<entry align="center"> 7.1 </entry>
|
|
<entry><code> __cpp_lib_array_constexpr >= 201603 </code></entry>
|
|
</row>
|
|
|
|
<row>
|
|
<?dbhtml bgcolor="#C8B0B0" ?>
|
|
<entry> The Parallelism TS Should be Standardized </entry>
|
|
<entry>
|
|
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0024r2.html">
|
|
P0024R2
|
|
</link>
|
|
</entry>
|
|
<entry align="center"> No </entry>
|
|
<entry><code> __has_include(<execution>) </code>,
|
|
<code> __cpp_lib_execution >= 201603 </code>,
|
|
<code> __cpp_lib_parallel_algorithm >= 201603 </code>
|
|
</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry> An algorithm to "clamp" a value between a pair of boundary values </entry>
|
|
<entry>
|
|
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0025r0.html">
|
|
P0025R0
|
|
</link>
|
|
</entry>
|
|
<entry align="center"> 7.1 </entry>
|
|
<entry><code> __cpp_lib_clamp >= 201603 </code></entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry> Adopt Selected Library Fundamentals V2 Components for C++17 </entry>
|
|
<entry>
|
|
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0295r0.pdf">
|
|
P0295R0
|
|
</link>
|
|
</entry>
|
|
<entry align="center"> 7.1 </entry>
|
|
<entry><code> __cpp_lib_gcd_lcm >= 201606 </code></entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry> Proposal to Introduce a 3-Argument Overload to <code>std::hypot</code> </entry>
|
|
<entry>
|
|
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0030r1.pdf">
|
|
P0030R1
|
|
</link>
|
|
</entry>
|
|
<entry align="center"> 7.1 </entry>
|
|
<entry><code> __cpp_lib_hypot >= 201603 </code></entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry> Mathematical Special Functions for C++17 </entry>
|
|
<entry>
|
|
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0226r1.pdf">
|
|
P0226R1
|
|
</link>
|
|
</entry>
|
|
<entry align="center"> 7.1 </entry>
|
|
<entry><code> __cpp_lib_math_special_functions >= 201603 </code>
|
|
(see Note 3)
|
|
</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<?dbhtml bgcolor="#C8B0B0" ?>
|
|
<entry>Adopt the File System TS for C++17 </entry>
|
|
<entry>
|
|
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0218r1.html">
|
|
P0218R1
|
|
</link>
|
|
</entry>
|
|
<entry align="center"> No </entry>
|
|
<entry><code> __has_include(<filesystem>) </code>,
|
|
<code> __cpp_lib_filesystem >= 201603 </code></entry>
|
|
</row>
|
|
|
|
<row>
|
|
<?dbhtml bgcolor="#C8B0B0" ?>
|
|
<entry> Relative Paths for Filesystem</entry>
|
|
<entry>
|
|
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0219r1.html">
|
|
P0219R1
|
|
</link>
|
|
</entry>
|
|
<entry align="center"> No </entry>
|
|
<entry><code> __cpp_lib_filesystem >= 201606 </code></entry>
|
|
</row>
|
|
|
|
<row>
|
|
<?dbhtml bgcolor="#C8B0B0" ?>
|
|
<entry> Adapting string_view by filesystem paths </entry>
|
|
<entry>
|
|
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0392r0.pdf">
|
|
P0392R0
|
|
</link>
|
|
</entry>
|
|
<entry align="center"> No </entry>
|
|
<entry><code> __cpp_lib_filesystem >= 201606 </code></entry>
|
|
</row>
|
|
|
|
<row>
|
|
<?dbhtml bgcolor="#C8B0B0" ?>
|
|
<entry> Directory Entry Caching for Filesystem </entry>
|
|
<entry>
|
|
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0317r1.html">
|
|
P0317R1
|
|
</link>
|
|
</entry>
|
|
<entry align="center"> No </entry>
|
|
<entry><code> __cpp_lib_filesystem >= 201703 </code></entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry> constexpr <code>atomic<T>::is_always_lock_free</code> </entry>
|
|
<entry>
|
|
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0152r1.html">
|
|
P0152R1
|
|
</link>
|
|
</entry>
|
|
<entry align="center"> 7.1 </entry>
|
|
<entry><code> __cpp_lib_atomic_is_always_lock_free >= 201603 </code></entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry>A proposal to add <code>shared_mutex</code> (untimed) (Revision 4)</entry>
|
|
<entry>
|
|
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4508.html">
|
|
N4508
|
|
</link>
|
|
</entry>
|
|
<entry align="center"> 6.1 </entry>
|
|
<entry><code> __cpp_lib_shared_mutex >= 201505 </code></entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry> Variadic <code>lock_guard</code> (Rev. 5) </entry>
|
|
<entry>
|
|
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0156r2.html">
|
|
P0156R2
|
|
</link>
|
|
</entry>
|
|
<entry align="center"> 7.1 </entry>
|
|
<entry><code> __cpp_lib_scoped_lock >= 201703 </code></entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry> A byte type definition </entry>
|
|
<entry>
|
|
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0298r3.pdf">
|
|
P0298R3
|
|
</link>
|
|
</entry>
|
|
<entry align="center"> 7.1 </entry>
|
|
<entry><code> __cpp_lib_byte >= 201603 </code> (since 7.3, see Note 2)
|
|
</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<?dbhtml bgcolor="#B0B0B0" ?>
|
|
<entry> Elementary string conversions </entry>
|
|
<entry>
|
|
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0067r5.html">
|
|
P0067R5
|
|
</link>
|
|
</entry>
|
|
<entry align="center"> 8 (only integral types supported) </entry>
|
|
<entry><code> __has_include(<charconv>) </code>
|
|
<code> __cpp_lib_to_chars >= 201611 </code></entry>
|
|
</row>
|
|
|
|
|
|
</tbody>
|
|
</tgroup>
|
|
</table>
|
|
|
|
<para>
|
|
Note 1: This feature is supported in GCC 7.1 and 7.2 but before GCC 7.3 the
|
|
<code>__cpp_lib</code> macro is not defined, and compilation will fail if the
|
|
header is included without using <option>-std</option> to enable C++17 support.
|
|
</para>
|
|
|
|
<para>
|
|
Note 2: This feature is supported in older releases but the
|
|
<code>__cpp_lib</code> macro is not defined to the right value
|
|
(or not defined at all) until the version shown in parentheses.
|
|
</para>
|
|
|
|
<para>
|
|
Note 3: The mathematical special functions are enabled in C++17 mode from
|
|
GCC 7.1 onwards. For GCC 6.x or for C++11/C++14 define
|
|
<code>__STDCPP_WANT_MATH_SPEC_FUNCS__</code> to a non-zero value
|
|
and test for <code>__STDCPP_MATH_SPEC_FUNCS__ >= 201003L</code>.
|
|
</para>
|
|
|
|
<table frame="all" xml:id="table.cxx17_ts_status">
|
|
<title>C++ Technical Specifications Implementation Status</title>
|
|
|
|
<tgroup cols="4" align="left" colsep="0" rowsep="1">
|
|
<colspec colname="c1"/>
|
|
<colspec colname="c2"/>
|
|
<colspec colname="c3"/>
|
|
<colspec colname="c4"/>
|
|
<thead>
|
|
<row>
|
|
<entry>Paper</entry>
|
|
<entry>Title</entry>
|
|
<entry>Status</entry>
|
|
<entry>Comments</entry>
|
|
</row>
|
|
</thead>
|
|
|
|
<tbody>
|
|
|
|
<row>
|
|
<entry>
|
|
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2014/n4076.html">
|
|
N4076
|
|
</link>
|
|
</entry>
|
|
<entry>A generalized callable negator</entry>
|
|
<entry>Y</entry>
|
|
<entry>Library Fundamentals 2 TS</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry>
|
|
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2014/n4273.htm">
|
|
N4273
|
|
</link>
|
|
</entry>
|
|
<entry>Uniform Container Erasure</entry>
|
|
<entry>Y</entry>
|
|
<entry>Library Fundamentals 2 TS</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry>
|
|
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4061.pdf">
|
|
N4061
|
|
</link>
|
|
</entry>
|
|
<entry>Greatest Common Divisor and Least Common Multiple</entry>
|
|
<entry>Y</entry>
|
|
<entry>Library Fundamentals 2 TS</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry>
|
|
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4066.htm">
|
|
N4066
|
|
</link>
|
|
</entry>
|
|
<entry>Delimited iterators</entry>
|
|
<entry>Y</entry>
|
|
<entry>Library Fundamentals 2 TS</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry>
|
|
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4282.pdf">
|
|
N4282
|
|
</link>
|
|
</entry>
|
|
<entry>The World's Dumbest Smart Pointer</entry>
|
|
<entry>Y</entry>
|
|
<entry>Library Fundamentals 2 TS</entry>
|
|
</row>
|
|
|
|
|
|
<row>
|
|
<entry>
|
|
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4388.html">
|
|
N4388
|
|
</link>
|
|
</entry>
|
|
<entry>Const-Propagating Wrapper</entry>
|
|
<entry>Y</entry>
|
|
<entry>Library Fundamentals 2 TS</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry>
|
|
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4391.html">
|
|
N4391
|
|
</link>
|
|
</entry>
|
|
<entry> <code>make_array</code>, revision 4 </entry>
|
|
<entry>Y</entry>
|
|
<entry>Library Fundamentals 2 TS</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry>
|
|
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4502.pdf">
|
|
N4502
|
|
</link>
|
|
</entry>
|
|
<entry> Support for the C++ Detection Idiom, V2 </entry>
|
|
<entry>Y</entry>
|
|
<entry>Library Fundamentals 2 TS</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry>
|
|
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4519.pdf">
|
|
N4519
|
|
</link>
|
|
</entry>
|
|
<entry> Source-Code Information Capture </entry>
|
|
<entry>Y</entry>
|
|
<entry>Library Fundamentals 2 TS</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<?dbhtml bgcolor="#C8B0B0" ?>
|
|
<entry>
|
|
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4521.html">
|
|
N4521
|
|
</link>
|
|
</entry>
|
|
<entry> Merge Fundamentals V1 into V2 </entry>
|
|
<entry>N</entry>
|
|
<entry>Library Fundamentals 2 TS</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry>
|
|
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://open-std.org/JTC1/SC22/WG21/docs/papers/2015/p0013r1.html">
|
|
P0013R1
|
|
</link>
|
|
</entry>
|
|
<entry>Logical Operator Type Traits (revision 1)</entry>
|
|
<entry>Y</entry>
|
|
<entry>Library Fundamentals 2 TS</entry>
|
|
</row>
|
|
|
|
|
|
</tbody>
|
|
</tgroup>
|
|
</table>
|
|
|
|
<section xml:id="iso.2017.specific" xreflabel="Implementation Specific"><info><title>Implementation Specific Behavior</title></info>
|
|
|
|
<para>For behaviour which is also specified by previous standards,
|
|
see <link linkend="iso.1998.specific">C++ 1998/2003 Implementation
|
|
Specific Behavior</link> and <link linkend="iso.2011.specific">C++
|
|
2011 Implementation Specific Behavior</link>. This section only
|
|
documents behaviour which is new in the 2017 standard.
|
|
</para>
|
|
|
|
<para>
|
|
<emphasis>23.6.5 [optional.bad_optional_access]</emphasis>
|
|
<code>what()</code> returns <literal>"bad optional access"</literal>.
|
|
</para>
|
|
|
|
<para>
|
|
<emphasis>23.7.3 [variant.variant]</emphasis>
|
|
Whether <classname>variant</classname> supports over-aligned types
|
|
should be documented here.
|
|
</para>
|
|
|
|
<para>
|
|
<emphasis>23.7.10 [variant.bad.access]</emphasis>
|
|
<code>what()</code> returns <literal>"Unexpected index"</literal>.
|
|
</para>
|
|
|
|
<para>
|
|
<emphasis>23.12.5.2 [memory.resource.pool.options]</emphasis>
|
|
The limits for maximum number of blocks and largest allocation size
|
|
supported by <classname>pool_options</classname> should be documented
|
|
here.
|
|
</para>
|
|
|
|
<para>
|
|
<emphasis>23.12.6.1 [memory.resource.monotonic.buffer.ctor]</emphasis>
|
|
The default <code>next_buffer_size</code> and growth factor should
|
|
be documented here.
|
|
</para>
|
|
|
|
<para>
|
|
<emphasis>23.15.4.3 [meta.unary.prop]</emphasis>
|
|
The predicate condition for
|
|
<code>has_unique_object_representations</code> is true for all scalar
|
|
types except floating point types.
|
|
</para>
|
|
|
|
<para>
|
|
<emphasis>23.19.3 [execpol.type],
|
|
28.4.3 [algorithms.parallel.exec]</emphasis>
|
|
There are no implementation-defined execution policies.
|
|
</para>
|
|
|
|
<para>
|
|
<emphasis>24.4.2 [string.view.template]</emphasis>
|
|
<classname>basic_string_view<C, T>::iterator</classname> is
|
|
<code>C*</code> and
|
|
<classname>basic_string_view<C, T>::const_iterator</classname> is
|
|
<code>const C*</code>.
|
|
</para>
|
|
|
|
|
|
<para>
|
|
<emphasis>28.4.3 [algorithms.parallel.exec]</emphasis>
|
|
Threads of execution created by <classname>std::thread</classname>
|
|
provide concurrent forward progress guarantees, so threads of execution
|
|
implicitly created by the library will provide parallel forward
|
|
progress guarantees.
|
|
</para>
|
|
|
|
<para>
|
|
<emphasis>29.4.1 [cfenv.syn]</emphasis>
|
|
The effects of the <filename><cfenv></filename> functions
|
|
depends on whether the <code>FENV_ACCESS</code> pragma is supported,
|
|
and on the C library that provides the header.
|
|
</para>
|
|
|
|
<para>
|
|
<emphasis>29.6.9 [c.math.rand]</emphasis>
|
|
Whether the <function>rand</function> function may introduce data
|
|
races depends on the target C library that provides the function.
|
|
</para>
|
|
|
|
<para>
|
|
<emphasis>29.9.5 [sf.cmath]</emphasis>
|
|
The effect of calling the mathematical special functions with large
|
|
inputs should be documented here.
|
|
</para>
|
|
|
|
<para>
|
|
<emphasis>30.10.2.1 [fs.conform.9945]</emphasis>
|
|
The behavior of the filesystem library implementation will depend on
|
|
the target operating system. Some features will not be not supported
|
|
on some targets.
|
|
</para>
|
|
|
|
<para>
|
|
<emphasis>30.10.5 [fs.filesystem.syn]</emphasis>
|
|
The clock used for file times is
|
|
<classname>std::chrono::system_clock</classname>.
|
|
</para>
|
|
|
|
<para>
|
|
<emphasis>30.10.7.1 [fs.path.generic]</emphasis>
|
|
dot-dot in the root-directory refers to the root-directory itself.
|
|
</para>
|
|
|
|
|
|
</section>
|
|
|
|
</section>
|