libc++ C++14 Status

In April 2013, the C++ standard committee approved the draft for the next version of the C++ standard, initially known as "C++1y".

The draft standard includes papers and issues that were voted on at the previous three meetings (Kona, Portland, and Bristol)

In August 2014, this draft was approved by ISO as C++14

This page shows the status of libc++; the status of clang's support of the language features is here.

The groups that have contributed papers:

Paper Status

Paper #GroupPaper NameMeetingStatusFirst released version
3346LWGTerminology for Container Element Requirements - Rev 1KonaComplete3.4
3421LWGMaking Operator Functors greater<>PortlandComplete3.4
3462LWGstd::result_of and SFINAEPortlandComplete3.4
3469LWGConstexpr Library Additions: chrono, v3PortlandComplete3.4
3470LWGConstexpr Library Additions: containers, v2PortlandComplete3.4
3471LWGConstexpr Library Additions: utilities, v3PortlandComplete3.4
3302LWGConstexpr Library Additions: complex, v2PortlandComplete3.4
3545LWGAn Incremental Improvement to integral_constantBristolComplete3.4
3644LWGNull Forward IteratorsBristolComplete3.4
3668LWGstd::exchange()BristolComplete3.4
3658LWGCompile-time integer sequencesBristolComplete3.4
3670LWGAddressing Tuples by TypeBristolComplete3.4
3671LWGMaking non-modifying sequence operations more robustBristolComplete3.4
3656LWGmake_uniqueBristolComplete3.4
3654LWGQuoted StringsBristolComplete3.4
3642LWGUser-defined LiteralsBristolComplete3.4
3655LWGTransformationTraits Redux (excluding part 4)BristolComplete3.4
3657LWGAdding heterogeneous comparison lookup to associative containersBristolComplete3.4
3672LWGA proposal to add a utility class to represent optional objectsBristolRemoved from Draft Standardn/a
3669LWGFixing constexpr member functions without constBristolComplete3.4
3662LWGC++ Dynamic Arrays (dynarray)BristolRemoved from Draft Standardn/a
3659SG1Shared Locking in C++BristolComplete3.4
3779LWGUser-defined Literals for std::complexChicagoComplete3.4
3789LWGConstexpr Library Additions: functionalChicagoComplete3.4
3924LWGDiscouraging rand() in C++14IssaquahComplete3.5
3887LWGConsistent Metafunction AliasesIssaquahComplete3.5
3891SG1A proposal to rename shared_mutex to shared_timed_mutexIssaquahComplete3.5

Library Working group Issues Status

Issue #Issue NameMeetingStatus
1214Insufficient/inconsistent key immutability requirements for associative containersKonaComplete
2009Reporting out-of-bound values on numeric string conversionsKonaComplete
2010is_* traits for binding operations can't be meaningfully specializedKonaComplete
2015Incorrect pre-conditions for some type traitsKonaComplete
2021Further incorrect usages of result_ofKonaComplete
2028messages_base::catalog overspecifiedKonaComplete
2033Preconditions of reserve, shrink_to_fit, and resize functionsKonaComplete
2039Issues with std::reverse and std::copy_ifKonaComplete
2044No definition of "Stable" for copy algorithmsKonaComplete
2045forward_list::merge and forward_list::splice_after with unequal allocatorsKonaComplete
2047Incorrect "mixed" move-assignment semantics of unique_ptrKonaComplete
2050Unordered associative containers do not use allocator_traits to define member typesKonaComplete
2053Errors in regex bitmask typesKonaComplete
2061make_move_iterator and arraysKonaComplete
2064More noexcept issues in basic_stringKonaComplete
2065Minimal allocator interfaceKonaComplete
2067packaged_task should have deleted copy c'tor with const parameterKonaComplete
2069Inconsistent exception spec for basic_string move constructorKonaComplete
2096Incorrect constraints of future::get in regard to MoveAssignableKonaComplete
2102Why is std::launch an implementation-defined type?KonaComplete
2071std::valarray move-assignmentPortlandComplete
2074Off by one error in std::reverse_copyPortlandComplete
2081Allocator requirements should include CopyConstructiblePortlandComplete
2083const-qualification on weak_ptr::owner_beforePortlandComplete
2086Overly generic type support for math functionsPortlandComplete
2099Unnecessary constraints of va_start() usagePortlandComplete
2103std::allocator_traits<std::allocator<T>>::propagate_on_container_move_assignmentPortlandComplete
2105Inconsistent requirements on const_iterator's value_typePortlandComplete
2110remove can't swap but note says it mightPortlandComplete
2123merge() allocator requirements for lists versus forward listsPortlandComplete
2005unordered_map::insert(T&&) protection should apply to map tooPortlandComplete
2011Unexpected output required of stringsPortlandComplete
2048Unnecessary mem_fn overloadsPortlandComplete
2049is_destructible is underspecifiedPortlandComplete
2056future_errc enums start with value 0 (invalid value for broken_promise)PortlandComplete
2058valarray and begin/endPortlandComplete
2091Misplaced effect in m.try_lock_for()BristolComplete
2092Vague Wording for condition_variable_anyBristolComplete
2093Throws clause of condition_variable::wait with predicateBristolComplete
2094duration conversion overflow shouldn't participate in overload resolutionBristolComplete
2122merge() stability for lists versus forward listsBristolComplete
2128Absence of global functions cbegin/cendBristolComplete
2145error_category default constructorBristolComplete
2147Unclear hint type in Allocator's allocate functionBristolComplete
2148Hashing enums should be supported directly by std::hashBristolComplete
2149Concerns about 20.8/5BristolComplete
2162allocator_traits::max_size missing noexceptBristolComplete
2163nth_element requires inconsistent post-conditionsBristolComplete
2169Missing reset() requirements in unique_ptr specializationBristolComplete
2172Does atomic_compare_exchange_* accept v == nullptr arguments?BristolComplete
2080Specify when once_flag becomes invalidBristolComplete
2098promise throws clausesBristolComplete
2109Incorrect requirements for hash specializationsBristolComplete
2130missing ordering constraints for fencesBristolComplete
2138atomic_flag::clear ordering constraintsBristolComplete
2140notify_all_at_thread_exit synchronizationBristolComplete
2144Missing noexcept specification in type_indexBristolComplete
2174wstring_convert::converted() should be noexceptBristolComplete
2175string_convert and wbuffer_convert validityBristolComplete
2176Special members for wstring_convert and wbuffer_convertBristolComplete
2177Requirements on Copy/MoveInsertableBristolComplete
2185Missing throws clause for future/shared_future::wait_for/wait_untilBristolComplete
2187vector<bool> is missing emplace and emplace_back member functionsBristolComplete
2190ordering of condition variable operations, reflects Posix discussionBristolComplete
2196Specification of is_*[copy/move]_[constructible/assignable] unclear for non-referencable typesBristolComplete
2197Specification of is_[un]signed unclear for non-arithmetic typesBristolComplete
2200Data race avoidance for all containers, not only for sequencesBristolComplete
2203scoped_allocator_adaptor uses wrong argument types for piecewise constructionBristolComplete
2207basic_string::at should not have a Requires clauseBristolComplete
2209assign() overspecified for sequence containersBristolComplete
2210Missing allocator-extended constructor for allocator-aware containersBristolComplete
2211Replace ambiguous use of "Allocator" in container requirementsBristolComplete
2222Inconsistency in description of forward_list::splice_after single-element overloadBristolComplete
2225Unrealistic header inclusion checks requiredBristolComplete
2229Standard code conversion facets underspecifiedBristolComplete
2231DR 704 removes complexity guarantee for clear()BristolComplete
2235Undefined behavior without proper requirements on basic_string constructorsBristolComplete
2141common_type trait produces reference typesChicagoComplete
2246unique_ptr assignment effects w.r.t. deleterChicagoComplete
2247Type traits and std::nullptr_tChicagoComplete
2085Wrong description of effect 1 of basic_istream::ignoreChicagoComplete
2087iostream_category() and noexceptChicagoComplete
2143ios_base::xalloc should be thread-safeChicagoComplete
2150Unclear specification of find_endChicagoComplete
2180Exceptions from std::seed_seq operationsChicagoComplete
2194Impossible container requirements for adaptor typesChicagoComplete
2013Do library implementers have the freedom to add constexpr?ChicagoComplete
2018regex_traits::isctype Returns clause is wrongChicagoComplete
2078Throw specification of async() incompleteChicagoComplete
2097packaged_task constructors should be constrainedChicagoComplete
2100Timed waiting functions cannot timeout if launch::async policy usedChicagoComplete
2120What should async do if neither 'async' nor 'deferred' is set in policy?ChicagoComplete
2159atomic_flag initializationChicagoComplete
2275Why is forward_as_tuple not constexpr?ChicagoComplete
2284Inconsistency in allocator_traits::max_sizeChicagoComplete
2298is_nothrow_constructible is always false because of create<>ChicagoComplete
2300Redundant sections for map and multimap members should be removedChicagoComplete
NB comment: GB9 Remove gets from C++14ChicagoComplete
2135Unclear requirement for exceptions thrown in condition_variable::wait()IssaquahComplete
2291std::hash is vulnerable to collision DoS attackIssaquahComplete
2142packaged_task::operator() synchronization too broad?IssaquahComplete
2240Probable misuse of term "function scope" in [thread.condition]IssaquahComplete
2252Strong guarantee on vector::push_back() still broken with C++11?IssaquahComplete
2257Simplify container requirements with the new algorithmsIssaquahComplete
2268Setting a default argument in the declaration of a member function assign of std::basic_stringIssaquahComplete
2271regex_traits::lookup_classname specification unclearIssaquahComplete
2272quoted should use char_traits::eq for character comparisonIssaquahComplete
2278User-defined literals for Standard Library typesIssaquahComplete
2280begin / end for arrays should be constexpr and noexceptIssaquahComplete
2285make_reverse_iteratorIssaquahComplete
2299Effects of inaccessible key_compare::is_transparent type are not clearIssaquahComplete
1450Contradiction in regex_constantsIssaquahComplete
2003String exception inconsistency in erase.IssaquahComplete
2112User-defined classes that cannot be derived fromIssaquahComplete
2132std::function ambiguityIssaquahComplete
2182Container::[const_]reference types are misleadingly specifiedIssaquahComplete
2188Reverse iterator does not fully support targets that overload operator&IssaquahComplete
2193Default constructors for standard library containers are explicitIssaquahComplete
2205Problematic postconditions of regex_match and regex_searchIssaquahComplete
2213Return value of std::regex_replaceIssaquahComplete
2258a.erase(q1, q2) unable to directly return q2IssaquahComplete
2263Comparing iterators and allocator pointers with different const-characterIssaquahComplete
2293Wrong facet used by num_put::do_putIssaquahComplete
2301Why is std::tie not constexpr?IssaquahComplete
2304Complexity of count in unordered associative containersIssaquahComplete
2306match_results::reference should be value_type&, not const value_type&IssaquahComplete
2308Clarify container destructor requirements w.r.t. std::arrayIssaquahComplete
2313tuple_size should always derive from integral_constantIssaquahComplete
2314apply() should return decltype(auto) and use decay_t before tuple_sizeIssaquahComplete
2315weak_ptr should be movableIssaquahComplete
2316weak_ptr::lock() should be atomicIssaquahComplete
2317The type property queries should be UnaryTypeTraits returning size_tIssaquahComplete
2320select_on_container_copy_construction() takes allocators, not containersIssaquahComplete
2322Associative(initializer_list, stuff) constructors are underspecifiedIssaquahComplete
2323vector::resize(n, t)'s specification should be simplifiedIssaquahComplete
2324Insert iterator constructors should use addressof()IssaquahComplete
2329regex_match()/regex_search() with match_results should forbid temporary stringsIssaquahComplete
2330regex("meow", regex::icase) is technically forbidden but should be permittedIssaquahComplete
2332regex_iterator/regex_token_iterator should forbid temporary regexesIssaquahComplete
2339Wording issue in nth_elementIssaquahComplete
2341Inconsistency between basic_ostream::seekp(pos) and basic_ostream::seekp(off, dir)IssaquahComplete
2344quoted()'s interaction with padding is unclearIssaquahComplete
2346integral_constant's member functions should be marked noexceptIssaquahComplete
2350min, max, and minmax should be constexprIssaquahComplete
2356Stability of erasure in unordered associative containersIssaquahComplete
2357Remaining "Assignable" requirementIssaquahComplete
2359How does regex_constants::nosubs affect basic_regex::mark_count()?IssaquahComplete
2360reverse_iterator::operator*() is unimplementableIssaquahComplete
2104unique_lock move-assignment should not be noexceptIssaquahComplete
2186Incomplete action on async/launch::deferredIssaquahComplete
2075Progress guarantees, lock-free property, and scheduling assumptionsIssaquahComplete
2288Inconsistent requirements for shared mutexesIssaquahComplete

Last Updated: 25-Mar-2014