<p>This page shows the status of libc++; the status of clang's support of the language features is <ahref="http://clang.llvm.org/cxx_status.html">here</a>.</p>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3346.pdf">3346</a></td><td>LWG</td><td>Terminology for Container Element Requirements - Rev 1</td><td>Kona</td><td>Complete</td><td>3.4</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3462.html">3462</a></td><td>LWG</td><td>std::result_of and SFINAE</td><td>Portland</td><td>Complete</td><td>3.4</td></tr>
<!-- <tr><td>3639</td><td>CWG</td><td>Runtime-sized arrays with automatic storage duration (revision 5)</td><td>Bristol</td><td></td><td></td></tr> -->
<!-- <tr><td>3638</td><td>CWG</td><td>Return type deduction for normal functions</td><td>Bristol</td><td></td><td></td></tr> -->
<!-- <tr><td>3648</td><td>CWG</td><td>Wording Changes for Generalized Lambda-capture</td><td>Bristol</td><td></td><td></td></tr> -->
<!-- <tr><td>3653</td><td>CWG</td><td>Member initializers and aggregates</td><td>Bristol</td><td></td><td></td></tr> -->
<!-- <tr><td>3667</td><td>CWG</td><td>Drafting for Core 1402</td><td>Bristol</td><td></td><td></td></tr> -->
<!-- <tr><td>3652</td><td>CWG</td><td>Relaxing constraints on constexpr functions" and "constexpr member functions and implicit const</td><td>Bristol</td><td></td><td></td></tr> -->
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3545.pdf">3545</a></td><td>LWG</td><td>An Incremental Improvement to integral_constant</td><td>Bristol</td><td>Complete</td><td>3.4</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3670.html">3670</a></td><td>LWG</td><td>Addressing Tuples by Type</td><td>Bristol</td><td>Complete</td><td>3.4</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3671.html">3671</a></td><td>LWG</td><td>Making non-modifying sequence operations more robust</td><td>Bristol</td><td>Complete</td><td>3.4</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3655.pdf">3655</a></td><td>LWG</td><td>TransformationTraits Redux (excluding part 4)</td><td>Bristol</td><td>Complete</td><td>3.4</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3657.htm">3657</a></td><td>LWG</td><td>Adding heterogeneous comparison lookup to associative containers</td><td>Bristol</td><td>Complete</td><td>3.4</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3672.html">3672</a></td><td>LWG</td><td>A proposal to add a utility class to represent optional objects</td><td>Bristol</td><td><I>Removed from Draft Standard</I></td><td>n/a</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3669.pdf">3669</a></td><td>LWG</td><td>Fixing constexpr member functions without const</td><td>Bristol</td><td>Complete</td><td>3.4</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3659.html">3659</a></td><td>SG1</td><td>Shared Locking in C++</td><td>Bristol</td><td>Complete</td><td>3.4</td></tr>
<tr><td><ahref="http://wiki.edg.com/twiki/pub/Wg21chicago2013/FormalMotions/N3779-complex_literals.pdf">3779</a></td><td>LWG</td><td>User-defined Literals for std::complex</td><td>Chicago</td><td>Complete</td><td>3.4</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2010">2010</a></td><td>is_* traits for binding operations can't be meaningfully specialized</td><td>Kona</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2015">2015</a></td><td>Incorrect pre-conditions for some type traits</td><td>Kona</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2021">2021</a></td><td>Further incorrect usages of result_of</td><td>Kona</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2033">2033</a></td><td>Preconditions of reserve, shrink_to_fit, and resize functions</td><td>Kona</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2039">2039</a></td><td>Issues with std::reverse and std::copy_if</td><td>Kona</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2044">2044</a></td><td>No definition of "Stable" for copy algorithms</td><td>Kona</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2045">2045</a></td><td>forward_list::merge and forward_list::splice_after with unequal allocators</td><td>Kona</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2050">2050</a></td><td>Unordered associative containers do not use allocator_traits to define member types</td><td>Kona</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2053">2053</a></td><td>Errors in regex bitmask types</td><td>Kona</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2061">2061</a></td><td>make_move_iterator and arrays</td><td>Kona</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2064">2064</a></td><td>More noexcept issues in basic_string</td><td>Kona</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2067">2067</a></td><td>packaged_task should have deleted copy c'tor with const parameter</td><td>Kona</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2069">2069</a></td><td>Inconsistent exception spec for basic_string move constructor</td><td>Kona</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2096">2096</a></td><td>Incorrect constraints of future::get in regard to MoveAssignable</td><td>Kona</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2102">2102</a></td><td>Why is std::launch an implementation-defined type?</td><td>Kona</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2074">2074</a></td><td>Off by one error in std::reverse_copy</td><td>Portland</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2081">2081</a></td><td>Allocator requirements should include CopyConstructible 2083 const-qualification on weak_ptr::owner_before</td><td>Portland</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2083">2083</a></td><td>const-qualification on weak_ptr::owner_before</td><td>Portland</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2086">2086</a></td><td>Overly generic type support for math functions</td><td>Portland</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2099">2099</a></td><td>Unnecessary constraints of va_start() usage</td><td>Portland</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2105">2105</a></td><td>Inconsistent requirements on const_iterator's value_type</td><td>Portland</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2110">2110</a></td><td>remove can't swap but note says it might</td><td>Portland</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2123">2123</a></td><td>merge() allocator requirements for lists versus forward lists</td><td>Portland</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2005">2005</a></td><td>unordered_map::insert(T&&) protection should apply to map too</td><td>Portland</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2011">2011</a></td><td>Unexpected output required of strings</td><td>Portland</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2049">2049</a></td><td>is_destructible is underspecified</td><td>Portland</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2056">2056</a></td><td>future_errc enums start with value 0 (invalid value for broken_promise)</td><td>Portland</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2058">2058</a></td><td>valarray and begin/end</td><td>Portland</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2091">2091</a></td><td>Misplaced effect in m.try_lock_for()</td><td>Bristol</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2092">2092</a></td><td>Vague Wording for condition_variable_any</td><td>Bristol</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2093">2093</a></td><td>Throws clause of condition_variable::wait with predicate</td><td>Bristol</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2122">2122</a></td><td>merge() stability for lists versus forward lists</td><td>Bristol</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2128">2128</a></td><td>Absence of global functions cbegin/cend</td><td>Bristol</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2147">2147</a></td><td>Unclear hint type in Allocator's allocate function</td><td>Bristol</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2148">2148</a></td><td>Hashing enums should be supported directly by std::hash</td><td>Bristol</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2149">2149</a></td><td>Concerns about 20.8/5</td><td>Bristol</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2080">2080</a></td><td>Specify when once_flag becomes invalid</td><td>Bristol</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2109">2109</a></td><td>Incorrect requirements for hash specializations</td><td>Bristol</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2130">2130</a></td><td>missing ordering constraints for fences</td><td>Bristol</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2144">2144</a></td><td>Missing noexcept specification in type_index</td><td>Bristol</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2174">2174</a></td><td>wstring_convert::converted() should be noexcept</td><td>Bristol</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2175">2175</a></td><td>string_convert and wbuffer_convert validity</td><td>Bristol</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2176">2176</a></td><td>Special members for wstring_convert and wbuffer_convert</td><td>Bristol</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2177">2177</a></td><td>Requirements on Copy/MoveInsertable</td><td>Bristol</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2185">2185</a></td><td>Missing throws clause for future/shared_future::wait_for/wait_until</td><td>Bristol</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2187">2187</a></td><td>vector<bool> is missing emplace and emplace_back member functions</td><td>Bristol</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2196">2196</a></td><td>Specification of is_*[copy/move]_[constructible/assignable] unclear for non-referencable types</td><td>Bristol</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2197">2197</a></td><td>Specification of is_[un]signed unclear for non-arithmetic types</td><td>Bristol</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2200">2200</a></td><td>Data race avoidance for all containers, not only for sequences</td><td>Bristol</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2207">2207</a></td><td>basic_string::at should not have a Requires clause</td><td>Bristol</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2209">2209</a></td><td>assign() overspecified for sequence containers</td><td>Bristol</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2211">2211</a></td><td>Replace ambiguous use of "Allocator" in container requirements</td><td>Bristol</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2222">2222</a></td><td>Inconsistency in description of forward_list::splice_after single-element overload</td><td>Bristol</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2235">2235</a></td><td>Undefined behavior without proper requirements on basic_string constructors</td><td>Bristol</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2235">2235</a></td><td>Undefined behavior without proper requirements on basic_string constructors</td><td>Chicago</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2247">2247</a></td><td>Type traits and std::nullptr_t</td><td>Chicago</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2085">2085</a></td><td>Wrong description of effect 1 of basic_istream::ignore</td><td>Chicago</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2087">2087</a></td><td>iostream_category() and noexcept</td><td>Chicago</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2143">2143</a></td><td>ios_base::xalloc should be thread-safe</td><td>Chicago</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2150">2150</a></td><td>Unclear specification of find_end</td><td>Chicago</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2180">2180</a></td><td>Exceptions from std::seed_seq operations</td><td>Chicago</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2013">2013</a></td><td>Do library implementers have the freedom to add constexpr?</td><td>Chicago</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2018">2018</a></td><td>regex_traits::isctype Returns clause is wrong</td><td>Chicago</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2078">2078</a></td><td>Throw specification of async() incomplete</td><td>Chicago</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2097">2097</a></td><td>packaged_task constructors should be constrained</td><td>Chicago</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2100">2100</a></td><td>Timed waiting functions cannot timeout if launch::async policy used</td><td>Chicago</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2120">2120</a></td><td>What should async do if neither 'async' nor 'deferred' is set in policy?</td><td>Chicago</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2275">2275</a></td><td>Why is forward_as_tuple not constexpr?</td><td>Chicago</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2284">2284</a></td><td>Inconsistency in allocator_traits::max_size</td><td>Chicago</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2298">2298</a></td><td>is_nothrow_constructible is always false because of create<></td><td>Chicago</td><td>Complete</td></tr>
<tr><td><ahref="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2300">2300</a></td><td>Redundant sections for map and multimap members should be removed</td><td>Chicago</td><td>Complete</td></tr>
