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gcc/libstdc++-v3/doc/xml/manual/status_cxx2017.xml
Jonathan Wakely b2343559f2 Add array support to std::shared_ptr for C++17 
* doc/xml/manual/status_cxx2017.xml: Update status.
	* doc/html/manual/status.html: Regenerate.
	* include/bits/shared_ptr.h (shared_ptr(unique_ptr<_Yp, _Del>)): Add
	extension constructor to maintain C++14 behaviour.
	* include/bits/shared_ptr_base.h (__sp_array_delete): Add new struct.
	(__shared_count(_Ptr, false_type), __shared_count(_Ptr, true_type)):
	New constructors.
	(__sp_compatible_with, __sp_is_constructible): Add specializations
	for array support.
	(__sp_is_constructible_arr, __sp_is_constructible_arrN): New helpers.
	(__shared_ptr_access): New base class for observer member functions.
	(__shared_ptr::element_type): Use remove_extent.
	(__shared_ptr::_UniqCompatible): Add __sp_compatible_with check.
	(__shared_ptr(_Yp*)): Use tag dispatching to call new __shared_count
	constructor.
	(__shared_ptr(unique_ptr<_Yp, _Del>)): Add extension constructor.
	(__shared_ptr::operator*, __shared_ptr::operator->): Remove and
	inherit from __shared_ptr_access base class.
	(__shared_ptr::__has_esft_base): Return false for array types.
	(__weak_ptr::element_type): Use remove_extent.
	* include/experimental/bits/shared_ptr.h (__libfund_v1): Remove.
	(__shared_ptr<__libfund_v1<_Tp>>): Remove specializations.
	(__wak_ptr<__libfund_v1<_Tp>>): Likewise.
	(experimental::__sp_compatible_v): Redefine using
	__sp_compatible_with.
	(experimental::__sp_is_constructible_v): Redefine using
	__sp_is_constructible.
	(get_deleter, operator<<): Change argument from __shared_ptr to
	shared_ptr.
	* testsuite/20_util/shared_ptr/cons/array.cc: New test.
	* testsuite/20_util/shared_ptr/cons/unique_ptr_array.cc: Adjust for
	new behaviour.
	* testsuite/20_util/shared_ptr/observers/array.cc: Test observers for
	arrays.
	* testsuite/20_util/shared_ptr/observers/array_neg.cc: New test.

From-SVN: r242369
2016-11-13 22:57:45 +00:00

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<section xmlns="http://docbook.org/ns/docbook" version="5.0"
xml:id="status.iso.201z" xreflabel="Status C++ 201z">
<?dbhtml filename="status_iso_cxx201z.html"?>
<info><title>C++ 201z</title>
<keywordset>
<keyword>ISO C++</keyword>
<keyword>201z</keyword>
</keywordset>
</info>
<para>
In this implementation the <literal>-std=gnu++1z</literal> or
<literal>-std=c++1z</literal> flag must be used to enable language
and library
features. See <link linkend="manual.intro.using.flags">dialect</link>
options. The pre-defined symbol
<constant>__cplusplus</constant> is used to check for the
presence of the required flag.
</para>
<para>
This section describes the C++1z and library TS support in mainline GCC SVN,
not in any particular release.
</para>
<para>
The following table lists new library features that have been accepted into
the C++1z working draft. The "Proposal" column provides a link to the
ISO C++ committee proposal that describes the feature, while the "Status"
column indicates the first version of GCC that contains an implementation of
this feature (if it has been implemented).
The "SD-6 Feature Test" column shows the corresponding macro or header from
<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:
Feature-testing recommendations for C++</link>.
</para>
<table frame="all" xml:id="table.cxx1z_status">
<title>C++ 201z 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>Library Feature</entry>
<entry>Proposal</entry>
<entry>Status</entry>
<entry>SD-6 Feature Test</entry>
</row>
</thead>
<tbody>
<row>
<?dbhtml bgcolor="#C8B0B0" ?>
<entry>
<code>constexpr std::hardware_{constructive,destructive}_interference_size</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/p0154r1.html">
P0154R1
</link>
</entry>
<entry align="center"> No </entry>
<entry> <code>__cpp_lib_hardware_interference_size >= 201603</code> </entry>
</row>
<row>
<entry> Core Issue 1776: Replacement of class objects containing reference members</entry>
<entry>
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0137r1.html">
P0137R1
</link>
</entry>
<entry align="center"> 7 </entry>
<entry> <code>__cpp_lib_launder >= 201606</code> </entry>
</row>
<row>
<entry>Wording for <code>std::uncaught_exceptions</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/n4259.pdf">
N4259
</link>
</entry>
<entry align="center">6.1</entry>
<entry><code>__cpp_lib_uncaught_exceptions >= 201411</code></entry>
</row>
<row>
<entry> Variant: a type-safe union 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/p0088r3.html">
P0088R3
</link>
</entry>
<entry align="center"> 7 </entry>
<entry> <code>__has_include(&lt;variant&gt;)</code> </entry>
</row>
<row>
<entry> Library Fundamentals V1 TS Components: <code>optional</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/p0220r1.html">
P0220R1
</link>
</entry>
<entry align="center"> 7 </entry>
<entry> <code>__has_include(&lt;optional&gt;)</code> </entry>
</row>
<row>
<entry> Library Fundamentals V1 TS Components: <code>any</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/p0220r1.html">
P0220R1
</link>
</entry>
<entry align="center"> 7 </entry>
<entry> <code>__has_include(&lt;any&gt;)</code> </entry>
</row>
<row>
<entry> Library Fundamentals V1 TS Components: <code>string_view</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/p0220r1.html">
P0220R1
</link>
</entry>
<entry align="center"> 7 </entry>
<entry> <code>__has_include(&lt;string_view&gt;)</code> </entry>
</row>
<row>
<?dbhtml bgcolor="#C8B0B0" ?>
<entry> Library Fundamentals V1 TS Components: <code>memory_resource</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/p0220r1.html">
P0220R1
</link>
</entry>
<entry align="center"> No </entry>
<entry> <code>__has_include(&lt;memory_resource&gt;)</code> </entry>
</row>
<row>
<entry> Library Fundamentals V1 TS Components: <code>apply</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/p0220r1.html">
P0220R1
</link>
</entry>
<entry align="center"> 7 </entry>
<entry> <code>__cpp_lib_apply >= 201603</code> </entry>
</row>
<row>
<entry> Library Fundamentals V1 TS Components: <code>shared_ptr&lt;T[]&gt;</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/p0220r1.html">
P0220R1
</link>
</entry>
<entry align="center"> 7 </entry>
<entry> <code>__cpp_lib_shared_ptr_arrays >= 201603</code> </entry>
</row>
<row>
<entry> Library Fundamentals V1 TS Components: Searchers </entry>
<entry>
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0220r1.html">
P0220R1
</link>
</entry>
<entry align="center"> 7 </entry>
<entry> <code>__cpp_lib_boyer_moore_searcher >= 201603</code> </entry>
</row>
<row>
<entry> Library Fundamentals V1 TS Components: Sampling </entry>
<entry>
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0220r1.html">
P0220R1
</link>
</entry>
<entry align="center"> 7 </entry>
<entry> <code>__cpp_lib_sample >= 201603</code> </entry>
</row>
<row>
<entry> Constant View: A proposal for a <code>std::as_const</code> helper function template </entry>
<entry>
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="">
P0007R1
</link>
</entry>
<entry align="center"> 7 </entry>
<entry><code> __cpp_lib_as_const >= 201510 </code></entry>
</row>
<row>
<entry> Improving pair and tuple </entry>
<entry>
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4387">
N4387
</link>
</entry>
<entry align="center"> 6.1 </entry>
<entry> N/A </entry>
</row>
<row>
<entry> <code>make_from_tuple</code>: apply for construction </entry>
<entry>
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0209r2.pdf">
P0209R2
</link>
</entry>
<entry align="center"> 7 </entry>
<entry><code> __cpp_lib_make_from_tuple >= 201606 </code></entry>
</row>
<row>
<?dbhtml bgcolor="#C8B0B0" ?>
<entry>
Removing <code>auto_ptr</code>, <code>random_shuffle()</code>,
And Old <code>&lt;functional&gt;</code> Stuff
</entry>
<entry>
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4190.htm">
N4190
</link>
</entry>
<entry align="center">No (kept for backwards compatibility)</entry>
<entry/>
</row>
<row>
<?dbhtml bgcolor="#C8B0B0" ?>
<entry> Deprecating Vestigial Library Parts in 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/p0174r2.html">
P0174R2
</link>
</entry>
<entry align="center"> No </entry>
<entry/>
</row>
<row>
<entry> Making <code>std::owner_less</code> more flexible </entry>
<entry>
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0074r0.html">
P0074R0
</link>
</entry>
<entry align="center"> 7 </entry>
<entry><code> __cpp_lib_transparent_operators >= 201510 </code></entry>
</row>
<row>
<entry> <code>std::addressof</code> should be constexpr </entry>
<entry>
<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">
LWG2296
</link>
</entry>
<entry align="center"> 7 </entry>
<entry><code> __cpp_lib_addressof_constexpr >= 201603 </code></entry>
</row>
<row>
<entry> Safe conversions in <code>unique_ptr&lt;T[]&gt;</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/n4089.pdf">
N4089
</link>
</entry>
<entry align="center"> 6 </entry>
<entry/>
</row>
<row>
<entry> LWG 2228: Missing SFINAE rule in unique_ptr templated assignment </entry>
<entry>
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4366.html">
N4366
</link>
</entry>
<entry align="center"> 6 </entry>
<entry/>
</row>
<row>
<entry> Re-enabling <code>shared_from_this</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/p0033r1.html">
P0033R1
</link>
</entry>
<entry align="center"> 7 </entry>
<entry><code>__cpp_lib_enable_shared_from_this >= 201603</code></entry>
</row>
<row>
<entry> A proposal to add <code>invoke</code> function template </entry>
<entry>
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4169.html">
N4169
</link>
</entry>
<entry align="center"> 6.1 </entry>
<entry><code> __cpp_lib_invoke >= 201411 </code></entry>
</row>
<row>
<entry>TriviallyCopyable <code>reference_wrapper</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/n4277.html">
N4277
</link>
</entry>
<entry align="center"> 5.1 </entry>
<entry/>
</row>
<row>
<entry> Adopt <code>not_fn</code> from Library Fundamentals 2 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/p0005r4.html">
P0005R4
</link>
</entry>
<entry align="center"> 7 </entry>
<entry><code>__cpp_lib_not_fn >= 201603</code></entry>
</row>
<row>
<entry> Fixes for <code>not_fn</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/p0358r1.html">
P0358R1
</link>
</entry>
<entry align="center"> 7 </entry>
<entry/>
</row>
<row>
<entry> Fixing a design mistake in the searchers interface in Library Fundamentals </entry>
<entry>
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0253r1.pdf">
P0253R1
</link>
</entry>
<entry align="center"> 7 </entry>
<entry/>
</row>
<row>
<entry> Extending memory management tools </entry>
<entry>
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0040r3.html">
P0040R3
</link>
</entry>
<entry align="center"> 7 </entry>
<entry><code> </code></entry>
</row>
<row>
<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">
P0163R0
</link>
</entry>
<entry align="center"> 7 </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">
N3911
</link>
</entry>
<entry align="center">6.1</entry>
<entry><code> __cpp_lib_void_t >= 201411</code></entry>
</row>
<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">
N4389
</link>
</entry>
<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">
P0006R0
</link>
</entry>
<entry align="center"> 7 </entry>
<entry><code> __cpp_lib_type_trait_variable_templates >= 201510 </code></entry>
</row>
<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 </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 </entry>
<entry><code> __cpp_lib_has_unique_object_representations >= 201606 </code></entry>
</row>
<row>
<?dbhtml bgcolor="#C8B0B0" ?>
<entry> Ordered by default </entry>
<entry>
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0181r1.html">
P0181R1
</link>
</entry>
<entry align="center"> No </entry>
<entry><code> __cpp_lib_default_order >= 201606</code></entry>
</row>
<row>
<entry> Polishing <code>&lt;chrono&gt;</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 </entry>
<entry><code> __cpp_lib_chrono >= 201510 </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 </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 </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.htm">
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"> 6.2 (3.0)</entry>
<entry><code> __cpp_lib_incomplete_container_elements >= 201505 </code>
(the feature was always supported, but the macro was not defined until GCC 6.2)
</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 </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 </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 </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(&lt;execution&gt;) </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 </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 </entry>
<entry><code> __cpp_lib_gcd >= 201606 </code>,
<code> __cpp_lib_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 </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 (6.1) </entry>
<entry><code> __cpp_lib_math_special_functions >= 201603 </code>
(for GCC 6 or pre-C++17 define
<code>__STDCPP_WANT_MATH_SPEC_FUNCS__</code> to a non-zero value
and test for <code>__STDCPP_MATH_SPEC_FUNCS__ >= 201003L</code>)
</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(&lt;filesystem&gt;) </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/>
</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/>
</row>
<row>
<entry> constexpr <code>atomic&lt;T&gt;::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 </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>
<?dbhtml bgcolor="#C8B0B0" ?>
<entry> Variadic <code>lock_guard</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/p0156r0.html">
P0156R0
</link>
</entry>
<entry align="center"> No </entry>
<entry><code> __cpp_lib_lock_guard_variadic >= 201510 </code></entry>
</row>
</tbody>
</tgroup>
</table>
<table frame="all" xml:id="table.cxx1z_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>
<?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/n4519.pdf">
N4519
</link>
</entry>
<entry> Source-Code Information Capture </entry>
<entry>N</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>20.6.5 [optional.bad_optional_access]</emphasis>
<code>what()</code> returns <literal>"bad optional access"</literal>.
</para>
<para>
<emphasis>20.7.2 [variant.variant]</emphasis>
Whether <classname>variant</classname> supports over-aligned types
should be documented here.
</para>
<para>
<emphasis>20.7.10 [variant.bad.access]</emphasis>
<code>what()</code> returns <literal>"Unexpected index"</literal>.
</para>
<para>
<emphasis>20.12.5.2 [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>20.12.6.1 [memory.resource.monotonic.buffer.ctor]</emphasis>
The default <code>next_buffer_size</code> and growth factor should
be documented here.
</para>
<para>
<emphasis>20.15.4.3 [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>20.19.3 [execpol.type],
25.2.3 [algorithms.parallel.exec]</emphasis>
There are no implementation-defined execution policies.
</para>
<para>
<emphasis>22.4.2 [string.view.template]</emphasis>
<classname>basic_string_view&lt;C, T&gt;::iterator</classname> is
<code>C*</code> and
<classname>basic_string_view&lt;C, T&gt;::const_iterator</classname> is
<code>const C*</code>.
</para>
<para>
<emphasis>25.2.3 [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>26.4.1 [cfenv.syn]</emphasis>
The effects of the <filename>&lt;cfenv&gt;</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>26.6.9 [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>26.9.5 [sf.cmath]</emphasis>
The effect of calling the mathematical special functions with large
inputs should be documented here.
</para>
<para>
<emphasis>27.10.2.1 [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>27.10.6 [fs.filesystem.syn]</emphasis>
The clock used for file times is
<classname>std::chrono::system_clock</classname>.
</para>
<para>
<emphasis>27.10.8 [path.generic]</emphasis>
dot-dot in the root-directory refers to the root-directory itself.
</para>
</section>
</section>
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