libc++ C++1z Status
In November 2014, the C++ standard committee created a draft for the next version of the C++ standard, known here as "C++1z" (probably to be C++17).
In February 2017, the C++ standard committee approved this draft, and sent it to ISO for approval as C++17
This page shows the status of libc++; the status of clang's support of the language features is here.
Reminder: Features in unreleased drafts of the standard are subject to change.
The groups that have contributed papers:
- LWG - Library working group
- CWG - Core Language Working group
- SG1 - Study group #1 (Concurrency working group)
Paper Status
| Paper # | Group | Paper Name | Meeting | Status | First released version |
|---|---|---|---|---|---|
| N3911 | LWG | TransformationTrait Alias void_t. | Urbana | Complete | 3.6 |
| N4089 | LWG | Safe conversions in unique_ptr<T[]>. | Urbana | In progress | 3.9 |
| N4169 | LWG | A proposal to add invoke function template | Urbana | Complete | 3.7 |
| N4190 | LWG | Removing auto_ptr, random_shuffle(), And Old | Urbana | In progress | |
| N4258 | LWG | Cleaning-up noexcept in the Library. | Urbana | In progress | 3.7 |
| N4259 | CWG | Wording for std::uncaught_exceptions | Urbana | Complete | 3.7 |
| N4277 | LWG | TriviallyCopyable reference_wrapper. | Urbana | Complete | 3.2 |
| N4279 | LWG | Improved insertion interface for unique-key maps. | Urbana | Complete | 3.7 |
| N4280 | LWG | Non-member size() and more | Urbana | Complete | 3.6 |
| N4284 | LWG | Contiguous Iterators. | Urbana | Complete | 3.6 |
| N4285 | CWG | Cleanup for exception-specification and throw-expression. | Urbana | Complete | 4.0 |
| N4387 | LWG | improving pair and tuple | Lenexa | Complete | 4.0 |
| N4389 | LWG | bool_constant | Lenexa | Complete | 3.7 |
| N4508 | LWG | shared_mutex for C++17 | Lenexa | Complete | 3.7 |
| N4366 | LWG | LWG 2228 missing SFINAE rule | Lenexa | Complete | 3.1 |
| N4510 | LWG | Minimal incomplete type support for standard containers, revision 4 | Lenexa | Complete | 3.6 |
| P0004R1 | LWG | Remove Deprecated iostreams aliases. | Kona | Complete | 3.8 |
| P0006R0 | LWG | Adopt Type Traits Variable Templates for C++17. | Kona | Complete | 3.8 |
| P0092R1 | LWG | Polishing <chrono> | Kona | Complete | 3.8 |
| P0007R1 | LWG | Constant View: A proposal for a std::as_const helper function template. | Kona | Complete | 3.8 |
| P0156R0 | LWG | Variadic lock_guard(rev 3). | Kona | Reverted in Kona | 3.9 |
| P0074R0 | LWG | Making std::owner_less more flexible | Kona | Complete | 3.8 |
| P0013R1 | LWG | Logical type traits rev 2 | Kona | Complete | 3.8 |
| P0024R2 | LWG | The Parallelism TS Should be Standardized | Jacksonville | ||
| P0226R1 | LWG | Mathematical Special Functions for C++17 | Jacksonville | ||
| P0220R1 | LWG | Adopt Library Fundamentals V1 TS Components for C++17 | Jacksonville | In Progress | |
| P0218R1 | LWG | Adopt the File System TS for C++17 | Jacksonville | In Progress | |
| P0033R1 | LWG | Re-enabling shared_from_this | Jacksonville | Complete | 3.9 |
| P0005R4 | LWG | Adopt not_fn from Library Fundamentals 2 for C++17 | Jacksonville | Complete | 3.9 |
| P0152R1 | LWG | constexpr atomic::is_always_lock_free | Jacksonville | Complete | 3.9 |
| P0185R1 | LWG | Adding [nothrow-]swappable traits | Jacksonville | Complete | 3.9 |
| P0253R1 | LWG | Fixing a design mistake in the searchers interface | Jacksonville | Complete | 3.9 |
| P0025R0 | LWG | An algorithm to "clamp" a value between a pair of boundary values | Jacksonville | Complete | 3.9 |
| P0154R1 | LWG | constexpr std::hardware_{constructive,destructive}_interference_size | Jacksonville | ||
| P0030R1 | LWG | Proposal to Introduce a 3-Argument Overload to std::hypot | Jacksonville | Complete | 3.9 |
| P0031R0 | LWG | A Proposal to Add Constexpr Modifiers to reverse_iterator, move_iterator, array and Range Access | Jacksonville | Complete | 4.0 |
| P0272R1 | LWG | Give std::string a non-const .data() member function | Jacksonville | Complete | 3.9 |
| P0077R2 | LWG | is_callable, the missing INVOKE related trait | Jacksonville | Complete | 3.9 |
| p0032r3 | LWG | Homogeneous interface for variant, any and optional | Oulu | Complete | 4.0 |
| p0040r3 | LWG | Extending memory management tools | Oulu | Complete | 4.0 |
| p0063r3 | LWG | C++17 should refer to C11 instead of C99 | Oulu | Nothing to do | n/a |
| p0067r3 | LWG | Elementary string conversions | Oulu | Now P0067R5 | |
| p0083r3 | LWG | Splicing Maps and Sets | Oulu | ||
| p0084r2 | LWG | Emplace Return Type | Oulu | Complete | 4.0 |
| p0088r3 | LWG | Variant: a type-safe union for C++17 | Oulu | Complete | 4.0 |
| p0137r1 | CWG | Core Issue 1776: Replacement of class objects containing reference members | Oulu | Complete | 6.0 |
| p0163r0 | LWG | shared_ptr::weak_type | Oulu | Complete | 3.9 |
| p0174r2 | LWG | Deprecating Vestigial Library Parts in C++17 | Oulu | ||
| p0175r1 | LWG | Synopses for the C library | Oulu | ||
| p0180r2 | LWG | Reserve a New Library Namespace for Future Standardization | Oulu | Nothing to do | n/a |
| p0181r1 | LWG | Ordered by Default | Oulu | Removed in Kona | n/a |
| p0209r2 | LWG | make_from_tuple: apply for construction | Oulu | Complete | 3.9 |
| p0219r1 | LWG | Relative Paths for Filesystem | Oulu | ||
| p0254r2 | LWG | Integrating std::string_view and std::string | Oulu | Complete | 4.0 |
| p0258r2 | LWG | has_unique_object_representations | Oulu | Complete | 6.0 |
| p0295r0 | LWG | Adopt Selected Library Fundamentals V2 Components for C++17 | Oulu | Complete | 4.0 |
| p0302r1 | LWG | Removing Allocator Support in std::function | Oulu | Complete | 4.0 |
| p0307r2 | LWG | Making Optional Greater Equal Again | Oulu | Complete | 4.0 |
| p0336r1 | LWG | Better Names for Parallel Execution Policies in C++17 | Oulu | ||
| p0337r0 | LWG | Delete operator= for polymorphic_allocator | Oulu | Complete | 3.9 |
| p0346r1 | LWG | A <random> Nomenclature Tweak | Oulu | Complete | 3.9 |
| p0358r1 | LWG | Fixes for not_fn | Oulu | Complete | 3.9 |
| p0371r1 | LWG | Temporarily discourage memory_order_consume | Oulu | Nothing to do | n/a |
| p0392r0 | LWG | Adapting string_view by filesystem paths | Oulu | Complete | 4.0 |
| p0393r3 | LWG | Making Variant Greater Equal | Oulu | Complete | 4.0 |
| P0394r4 | LWG | Hotel Parallelifornia: terminate() for Parallel Algorithms Exception Handling | Oulu | ||
| P0003R5 | LWG | Removing Deprecated Exception Specifications from C++17 | Issaquah | Complete | 5.0 |
| P0067R5 | LWG | Elementary string conversions, revision 5 | Issaquah | ||
| P0403R1 | LWG | Literal suffixes for basic_string_view | Issaquah | Complete | 4.0 |
| P0414R2 | LWG | Merging shared_ptr changes from Library Fundamentals to C++17 | Issaquah | ||
| P0418R2 | LWG | Fail or succeed: there is no atomic lattice | Issaquah | ||
| P0426R1 | LWG | Constexpr for std::char_traits | Issaquah | Complete | 4.0 |
| P0435R1 | LWG | Resolving LWG Issues re common_type | Issaquah | Complete | 4.0 |
| P0502R0 | LWG | Throwing out of a parallel algorithm terminates - but how? | Issaquah | ||
| P0503R0 | LWG | Correcting library usage of "literal type" | Issaquah | Complete | 4.0 |
| P0504R0 | LWG | Revisiting in-place tag types for any/optional/variant | Issaquah | Complete | 4.0 |
| P0505R0 | LWG | Wording for GB 50 - constexpr for chrono | Issaquah | Complete | 4.0 |
| P0508R0 | LWG | Wording for GB 58 - structured bindings for node_handles | Issaquah | ||
| P0509R1 | LWG | Updating “Restrictions on exception handling” | Issaquah | Nothing to do | n/a |
| P0510R0 | LWG | Disallowing references, incomplete types, arrays, and empty variants | Issaquah | Complete | 4.0 |
| P0513R0 | LWG | Poisoning the Hash | Issaquah | Complete | 5.0 |
| P0516R0 | LWG | Clarify That shared_future’s Copy Operations have Wide Contracts | Issaquah | Complete | 4.0 |
| P0517R0 | LWG | Make future_error Constructible | Issaquah | Complete | 4.0 |
| P0521R0 | LWG | Proposed Resolution for CA 14 (shared_ptr use_count/unique) | Issaquah | Nothing to do | n/a |
| P0156R2 | LWG | Variadic Lock guard(rev 5) | Kona | Complete | 5.0 |
| P0270R3 | CWG | Removing C dependencies from signal handler wording | Kona | ||
| P0298R3 | CWG | A byte type definition | Kona | Complete | 5.0 |
| P0317R1 | LWG | Directory Entry Caching for Filesystem | Kona | ||
| P0430R2 | LWG | File system library on non-POSIX-like operating systems | Kona | ||
| P0433R2 | LWG | Toward a resolution of US7 and US14: Integrating template deduction for class templates into the standard library | Kona | ||
| P0452R1 | LWG | Unifying <numeric> Parallel Algorithms | Kona | ||
| P0467R2 | LWG | Iterator Concerns for Parallel Algorithms | Kona | ||
| P0492R2 | LWG | Proposed Resolution of C++17 National Body Comments for Filesystems | Kona | ||
| P0518R1 | LWG | Allowing copies as arguments to function objects given to parallel algorithms in response to CH11 | Kona | ||
| P0523R1 | LWG | Wording for CH 10: Complexity of parallel algorithms | Kona | ||
| P0548R1 | LWG | common_type and duration | Kona | Complete | 5.0 |
| P0558R1 | LWG | Resolving atomic<T> named base class inconsistencies | Kona | ||
| P0574R1 | LWG | Algorithm Complexity Constraints and Parallel Overloads | Kona | ||
| P0599R1 | LWG | noexcept for hash functions | Kona | Complete | 5.0 |
| P0604R0 | LWG | Resolving GB 55, US 84, US 85, US 86 | Kona | ||
| P0607R0 | LWG | Inline Variables for the Standard Library | Kona | In Progress | 6.0 |
| P0618R0 | LWG | Deprecating <codecvt> | Kona | ||
| P0623R0 | LWG | Final C++17 Parallel Algorithms Fixes | Kona | ||
| P0682R1 | LWG | Repairing elementary string conversions | Toronto | ||
| P0739R0 | LWG | Some improvements to class template argument deduction integration into the standard library | Toronto | Complete | 5.0 |
The parts of P0607 that are not done are the <regex> bits.
[ Note: "Nothing to do" means that no library changes were needed to implement this change -- end note]
Library Working group Issues Status
| Issue # | Issue Name | Meeting | Status |
|---|---|---|---|
| 2016 | Allocators must be no-throw swappable | Urbana | Complete |
| 2118 | unique_ptr for array does not support cv qualification conversion of actual argument | Urbana | Complete |
| 2170 | Aggregates cannot be DefaultConstructible | Urbana | Complete |
| 2308 | Clarify container destructor requirements w.r.t. std::array | Urbana | Complete |
| 2340 | Replacement allocation functions declared as inline | Urbana | Complete |
| 2354 | Unnecessary copying when inserting into maps with braced-init syntax | Urbana | Complete |
| 2377 | std::align requirements overly strict | Urbana | Complete |
| 2396 | underlying_type doesn't say what to do for an incomplete enumeration type | Urbana | Complete |
| 2399 | shared_ptr's constructor from unique_ptr should be constrained | Urbana | Complete |
| 2400 | shared_ptr's get_deleter() should use addressof() | Urbana | Complete |
| 2401 | std::function needs more noexcept | Urbana | Complete |
| 2404 | mismatch()'s complexity needs to be updated | Urbana | Complete |
| 2408 | SFINAE-friendly common_type / iterator_traits is missing in C++14 | Urbana | Complete |
| 2106 | move_iterator wrapping iterators returning prvalues | Urbana | Complete |
| 2129 | User specializations of std::initializer_list | Urbana | Complete |
| 2212 | tuple_size for const pair request | Urbana | Complete |
| 2217 | operator==(sub_match, string) slices on embedded '\0's | Urbana | Complete |
| 2230 | "see below" for initializer_list constructors of unordered containers | Urbana | Complete |
| 2233 | bad_function_call::what() unhelpful | Urbana | Complete |
| 2266 | vector and deque have incorrect insert requirements | Urbana | Complete |
| 2325 | minmax_element()'s behavior differing from max_element()'s should be noted | Urbana | Complete |
| 2361 | Apply 2299 resolution throughout library | Urbana | Complete |
| 2365 | Missing noexcept in shared_ptr::shared_ptr(nullptr_t) | Urbana | Complete |
| 2376 | bad_weak_ptr::what() overspecified | Urbana | Complete |
| 2387 | More nested types that must be accessible and unambiguous | Urbana | Complete |
| 2059 | C++0x ambiguity problem with map::erase | Lenexa | Complete |
| 2063 | Contradictory requirements for string move assignment | Lenexa | Complete |
| 2076 | Bad CopyConstructible requirement in set constructors | Lenexa | Complete |
| 2160 | Unintended destruction ordering-specification of resize | Lenexa | Complete |
| 2168 | Inconsistent specification of uniform_real_distribution constructor | Lenexa | Complete |
| 2239 | min/max/minmax requirements | Lenexa | Complete |
| 2364 | deque and vector pop_back don't specify iterator invalidation requirements | Lenexa | Complete |
| 2369 | constexpr max(initializer_list) vs max_element | Lenexa | Complete |
| 2378 | Behaviour of standard exception types | Lenexa | Complete |
| 2403 | stof() should call strtof() and wcstof() | Lenexa | Complete |
| 2406 | negative_binomial_distribution should reject p == 1 | Lenexa | Complete |
| 2407 | packaged_task(allocator_arg_t, const Allocator&, F&&) should neither be constrained nor explicit | Lenexa | Complete |
| 2411 | shared_ptr is only contextually convertible to bool | Lenexa | Complete |
| 2415 | Inconsistency between unique_ptr and shared_ptr | Lenexa | Complete |
| 2420 | function | Lenexa | Complete |
| 2425 | operator delete(void*, size_t) doesn't invalidate pointers sufficiently | Lenexa | Complete |
| 2427 | Container adaptors as sequence containers, redux | Lenexa | Complete |
| 2428 | "External declaration" used without being defined | Lenexa | Complete |
| 2433 | uninitialized_copy()/etc. should tolerate overloaded operator& | Lenexa | Complete |
| 2434 | shared_ptr::use_count() is efficient | Lenexa | Complete |
| 2437 | iterator_traits::reference can and can't be void | Lenexa | Complete |
| 2438 | std::iterator inheritance shouldn't be mandated | Lenexa | Complete |
| 2439 | unique_copy() sometimes can't fall back to reading its output | Lenexa | Complete |
| 2440 | seed_seq::size() should be noexcept | Lenexa | Complete |
| 2442 | call_once() shouldn't DECAY_COPY() | Lenexa | Complete |
| 2448 | Non-normative Container destructor specification | Lenexa | Complete |
| 2454 | Add raw_storage_iterator::base() member | Lenexa | Complete |
| 2455 | Allocator default construction should be allowed to throw | Lenexa | Complete |
| 2458 | N3778 and new library deallocation signatures | Lenexa | Complete |
| 2459 | std::polar should require a non-negative rho | Lenexa | Complete |
| 2464 | try_emplace and insert_or_assign misspecified | Lenexa | Complete |
| 2467 | is_always_equal has slightly inconsistent default | Lenexa | Complete |
| 2470 | Allocator's destroy function should be allowed to fail to instantiate | Lenexa | Complete |
| 2482 | [c.strings] Table 73 mentions nonexistent functions | Lenexa | Complete |
| 2488 | Placeholders should be allowed and encouraged to be constexpr | Lenexa | Complete |
| 1169 | num_get not fully compatible with strto* | Kona | Complete |
| 2072 | Unclear wording about capacity of temporary buffers | Kona | Complete |
| 2101 | Some transformation types can produce impossible types | Kona | Complete |
| 2111 | Which unexpected/terminate handler is called from the exception handling runtime? | Kona | Complete |
| 2119 | Missing hash specializations for extended integer types | Kona | Complete |
| 2127 | Move-construction with raw_storage_iterator | Kona | Complete |
| 2133 | Attitude to overloaded comma for iterators | Kona | Complete |
| 2156 | Unordered containers' reserve(n) reserves for n-1 elements | Kona | Complete |
| 2218 | Unclear how containers use allocator_traits::construct() | Kona | Complete |
| 2219 | INVOKE-ing a pointer to member with a reference_wrapper as the object expression | Kona | Complete |
| 2224 | Ambiguous status of access to non-live objects | Kona | Complete |
| 2234 | assert() should allow usage in constant expressions | Kona | Complete |
| 2244 | Issue on basic_istream::seekg | Kona | Complete |
| 2250 | Follow-up On Library Issue 2207 | Kona | Complete |
| 2259 | Issues in 17.6.5.5 rules for member functions | Kona | Complete |
| 2273 | regex_match ambiguity | Kona | |
| 2336 | is_trivially_constructible/is_trivially_assignable traits are always false | Kona | Complete |
| 2353 | std::next is over-constrained | Kona | Complete |
| 2367 | pair and tuple are not correctly implemented for is_constructible with no args | Kona | Complete |
| 2380 | May <cstdlib> provide long ::abs(long) and long long ::abs(long long)? | Kona | Complete |
| 2384 | Allocator's deallocate function needs better specification | Kona | Complete |
| 2385 | function::assign allocator argument doesn't make sense | Kona | Complete |
| 2435 | reference_wrapper::operator()'s Remark should be deleted | Kona | Complete |
| 2447 | Allocators and volatile-qualified value types | Kona | Complete |
| 2462 | std::ios_base::failure is overspecified | Kona | Complete |
| 2466 | allocator_traits::max_size() default behavior is incorrect | Kona | Complete |
| 2469 | Wrong specification of Requires clause of operator[] for map and unordered_map | Kona | Complete |
| 2473 | basic_filebuf's relation to C FILE semantics | Kona | Complete |
| 2476 | scoped_allocator_adaptor is not assignable | Kona | Complete |
| 2477 | Inconsistency of wordings in std::vector::erase() and std::deque::erase() | Kona | Complete |
| 2483 | throw_with_nested() should use is_final | Kona | Complete |
| 2484 | rethrow_if_nested() is doubly unimplementable | Kona | Complete |
| 2485 | get() should be overloaded for const tuple&& | Kona | Complete |
| 2486 | mem_fn() should be required to use perfect forwarding | Kona | Complete |
| 2487 | bind() should be const-overloaded, not cv-overloaded | Kona | Complete |
| 2489 | mem_fn() should be noexcept | Kona | Complete |
| 2492 | Clarify requirements for comp | Kona | Complete |
| 2495 | There is no such thing as an Exception Safety element | Kona | Complete |
| 2192 | Validity and return type of std::abs(0u) is unclear | Jacksonville | |
| 2276 | Missing requirement on std::promise::set_exception | Jacksonville | Complete |
| 2296 | std::addressof should be constexpr | Jacksonville | Complete (Clang Only) |
| 2450 | (greater|less|greater_equal|less_equal)<void> do not yield a total order for pointers | Jacksonville | Complete |
| 2520 | N4089 broke initializing unique_ptr<T[]> from a nullptr | Jacksonville | Complete |
| 2522 | [fund.ts.v2] Contradiction in set_default_resource specification | Jacksonville | Complete |
| 2523 | std::promise synopsis shows two set_value_at_thread_exit()'s for no apparent reason | Jacksonville | Complete |
| 2537 | Constructors for priority_queue taking allocators should call make_heap | Jacksonville | Complete |
| 2539 | [fund.ts.v2] invocation_trait definition definition doesn't work for surrogate call functions | Jacksonville | |
| 2545 | Simplify wording for bind without explicitly specified return type | Jacksonville | Complete |
| 2557 | Logical operator traits are broken in the zero-argument case | Jacksonville | Complete |
| 2558 | [fund.ts.v2] Logical operator traits are broken in the zero-argument case | Jacksonville | Complete |
| 2559 | Error in LWG 2234's resolution | Jacksonville | Complete |
| 2560 | is_constructible underspecified when applied to a function type | Jacksonville | Broken in 3.6; See r261653. |
| 2565 | std::function's move constructor should guarantee nothrow for reference_wrappers and function pointers | Jacksonville | Complete |
| 2566 | Requirements on the first template parameter of container adaptors | Jacksonville | Complete |
| 2571 | §[map.modifiers]/2 imposes nonsensical requirement on insert(InputIterator, InputIterator) | Jacksonville | Complete |
| 2572 | The remarks for shared_ptr::operator* should apply to cv-qualified void as well | Jacksonville | Complete |
| 2574 | [fund.ts.v2] std::experimental::function::operator=(F&&) should be constrained | Jacksonville | |
| 2575 | [fund.ts.v2] experimental::function::assign should be removed | Jacksonville | |
| 2576 | istream_iterator and ostream_iterator should use std::addressof | Jacksonville | Complete |
| 2577 | {shared,unique}_lock should use std::addressof | Jacksonville | Complete |
| 2579 | Inconsistency wrt Allocators in basic_string assignment vs. basic_string::assign | Jacksonville | Complete |
| 2581 | Specialization of <type_traits> variable templates should be prohibited | Jacksonville | Complete |
| 2582 | §[res.on.functions]/2's prohibition against incomplete types shouldn't apply to type traits | Jacksonville | Complete |
| 2583 | There is no way to supply an allocator for basic_string(str, pos) | Jacksonville | Complete |
| 2585 | forward_list::resize(size_type, const value_type&) effects incorrect | Jacksonville | Complete |
| 2586 | Wrong value category used in scoped_allocator_adaptor::construct() | Jacksonville | |
| 2590 | Aggregate initialization for std::array | Jacksonville | Complete |
| 2181 | Exceptions from seed sequence operations | Oulu | Complete |
| 2309 | mutex::lock() should not throw device_or_resource_busy | Oulu | Complete |
| 2310 | Public exposition only member in std::array | Oulu | Complete |
| 2312 | tuple's constructor constraints need to be phrased more precisely | Oulu | Complete |
| 2328 | Rvalue stream extraction should use perfect forwarding | Oulu | Complete |
| 2393 | std::function's Callable definition is broken | Oulu | Complete |
| 2422 | std::numeric_limits<T>::is_modulo description: "most machines" errata | Oulu | Complete |
| 2426 | Issue about compare_exchange | Oulu | |
| 2436 | Comparators for associative containers should always be CopyConstructible | Oulu | Complete |
| 2441 | Exact-width atomic typedefs should be provided | Oulu | Complete |
| 2451 | [fund.ts.v2] optional should 'forward' T's implicit conversions | Oulu | |
| 2509 | [fund.ts.v2] any_cast doesn't work with rvalue reference targets and cannot move with a value target | Oulu | Complete |
| 2516 | [fund.ts.v2] Public "exposition only" members in observer_ptr | Oulu | |
| 2542 | Missing const requirements for associative containers | Oulu | |
| 2549 | Tuple EXPLICIT constructor templates that take tuple parameters end up taking references to temporaries and will create dangling references | Oulu | Complete |
| 2550 | Wording of unordered container's clear() method complexity | Oulu | Complete |
| 2551 | [fund.ts.v2] "Exception safety" cleanup in library fundamentals required | Oulu | Complete |
| 2555 | [fund.ts.v2] No handling for over-aligned types in optional | Oulu | Complete |
| 2573 | [fund.ts.v2] std::hash<std::experimental::shared_ptr> does not work for arrays | Oulu | |
| 2596 | vector::data() should use addressof | Oulu | Complete |
| 2667 | path::root_directory() description is confusing | Oulu | Complete |
| 2669 | recursive_directory_iterator effects refers to non-existent functions | Oulu | Complete |
| 2670 | system_complete refers to undefined variable 'base' | Oulu | Complete |
| 2671 | Errors in Copy | Oulu | Complete |
| 2673 | status() effects cannot be implemented as specified | Oulu | Complete |
| 2674 | Bidirectional iterator requirement on path::iterator is very expensive | Oulu | Complete |
| 2683 | filesystem::copy() says "no effects" | Oulu | Complete |
| 2684 | priority_queue lacking comparator typedef | Oulu | Complete |
| 2685 | shared_ptr deleters must not throw on move construction | Oulu | Complete |
| 2687 | {inclusive,exclusive}_scan misspecified | Oulu | |
| 2688 | clamp misses preconditions and has extraneous condition on result | Oulu | Complete |
| 2689 | Parallel versions of std::copy and std::move shouldn't be in order | Oulu | |
| 2698 | Effect of assign() on iterators/pointers/references | Oulu | Complete |
| 2704 | recursive_directory_iterator's members should require '*this is dereferenceable' | Oulu | Complete |
| 2706 | Error reporting for recursive_directory_iterator::pop() is under-specified | Oulu | Complete |
| 2707 | path construction and assignment should have "string_type&&" overloads | Oulu | Complete |
| 2709 | offsetof is unnecessarily imprecise | Oulu | |
| 2710 | "Effects: Equivalent to ..." doesn't count "Synchronization:" as determined semantics | Oulu | Complete |
| 2711 | path is convertible from approximately everything under the sun | Oulu | Complete |
| 2716 | Specification of shuffle and sample disallows lvalue URNGs | Oulu | Complete |
| 2718 | Parallelism bug in [algorithms.parallel.exec] p2 | Oulu | |
| 2719 | permissions function should not be noexcept due to narrow contract | Oulu | Complete |
| 2720 | permissions function incorrectly specified for symlinks | Oulu | Complete |
| 2721 | remove_all has incorrect post conditions | Oulu | Complete |
| 2723 | Do directory_iterator and recursive_directory_iterator become the end iterator upon error? | Oulu | Complete |
| 2724 | The protected virtual member functions of memory_resource should be private | Oulu | |
| 2725 | filesystem::exists(const path&, error_code&) error reporting | Oulu | Complete |
| 2726 | [recursive_]directory_iterator::increment(error_code&) is underspecified | Oulu | Complete |
| 2727 | Parallel algorithms with constexpr specifier | Oulu | |
| 2728 | status(p).permissions() and symlink_status(p).permissions() are not specified | Oulu | Complete |
| 2062 | Effect contradictions w/o no-throw guarantee of std::function swaps | Issaquah | Complete |
| 2166 | Heap property underspecified? | Issaquah | |
| 2221 | No formatted output operator for nullptr | Issaquah | |
| 2223 | shrink_to_fit effect on iterator validity | Issaquah | Complete |
| 2261 | Are containers required to use their 'pointer' type internally? | Issaquah | |
| 2394 | locale::name specification unclear - what is implementation-defined? | Issaquah | Complete |
| 2460 | LWG issue 2408 and value categories | Issaquah | Complete |
| 2468 | Self-move-assignment of library types | Issaquah | |
| 2475 | Allow overwriting of std::basic_string terminator with charT() to allow cleaner interoperation with legacy APIs | Issaquah | Complete |
| 2503 | multiline option should be added to syntax_option_type | Issaquah | |
| 2510 | Tag types should not be DefaultConstructible | Issaquah | |
| 2514 | Type traits must not be final | Issaquah | Complete |
| 2518 | [fund.ts.v2] Non-member swap for propagate_const should call member swap | Issaquah | |
| 2519 | Iterator operator-= has gratuitous undefined behaviour | Issaquah | Complete |
| 2521 | [fund.ts.v2] weak_ptr's converting move constructor should be modified as well for array support | Issaquah | |
| 2525 | [fund.ts.v2] get_memory_resource should be const and noexcept | Issaquah | |
| 2527 | [fund.ts.v2] ALLOCATOR_OF for function::operator= has incorrect default | Issaquah | |
| 2531 | future::get should explicitly state that the shared state is released | Issaquah | |
| 2534 | Constrain rvalue stream operators | Issaquah | |
| 2536 | What should <complex.h> do? | Issaquah | Complete |
| 2540 | unordered_multimap::insert hint iterator | Issaquah | Complete |
| 2543 | LWG 2148 (hash support for enum types) seems under-specified | Issaquah | Complete |
| 2544 | istreambuf_iterator(basic_streambuf | Issaquah | Complete |
| 2556 | Wide contract for future::share() | Issaquah | Complete |
| 2562 | Consistent total ordering of pointers by comparison functors | Issaquah | |
| 2567 | Specification of logical operator traits uses BaseCharacteristic, which is defined only for UnaryTypeTraits and BinaryTypeTraits | Issaquah | Complete |
| 2568 | [fund.ts.v2] Specification of logical operator traits uses BaseCharacteristic, which is defined only for UnaryTypeTraits and BinaryTypeTraits | Issaquah | |
| 2569 | conjunction and disjunction requirements are too strict | Issaquah | Complete |
| 2570 | [fund.ts.v2] conjunction and disjunction requirements are too strict | Issaquah | |
| 2578 | Iterator requirements should reference iterator traits | Issaquah | Complete |
| 2584 | Issaquah | ||
| 2587 | "Convertible to bool" requirement in conjunction and disjunction | Issaquah | |
| 2588 | [fund.ts.v2] "Convertible to bool" requirement in conjunction and disjunction | Issaquah | |
| 2589 | match_results can't satisfy the requirements of a container | Issaquah | Complete |
| 2591 | std::function's member template target() should not lead to undefined behaviour | Issaquah | Complete |
| 2598 | addressof works on temporaries | Issaquah | Complete |
| 2664 | operator/ (and other append) semantics not useful if argument has root | Issaquah | Complete |
| 2665 | remove_filename() post condition is incorrect | Issaquah | Complete |
| 2672 | Should is_empty use error_code in its specification? | Issaquah | Complete |
| 2678 | std::filesystem enum classes overspecified | Issaquah | Complete |
| 2679 | Inconsistent Use of Effects and Equivalent To | Issaquah | Complete |
| 2680 | Add "Equivalent to" to filesystem | Issaquah | Complete |
| 2681 | filesystem::copy() cannot copy symlinks | Issaquah | Complete |
| 2682 | filesystem::copy() won't create a symlink to a directory | Issaquah | Complete |
| 2686 | Why is std::hash specialized for error_code, but not error_condition? | Issaquah | Complete |
| 2694 | Application of LWG 436 accidentally deleted definition of "facet" | Issaquah | Complete |
| 2696 | Interaction between make_shared and enable_shared_from_this is underspecified | Issaquah | |
| 2699 | Missing restriction in [numeric.requirements] | Issaquah | Complete |
| 2712 | copy_file(from, to, ...) has a number of unspecified error conditions | Issaquah | Complete |
| 2722 | equivalent incorrectly specifies throws clause | Issaquah | Complete |
| 2729 | Missing SFINAE on std::pair::operator= | Issaquah | |
| 2732 | Questionable specification of path::operator/= and path::append | Issaquah | Complete |
| 2733 | [fund.ts.v2] gcd / lcm and bool | Issaquah | Complete |
| 2735 | std::abs(short), std::abs(signed char) and others should return int instead of double in order to be compatible with C++98 and C | Issaquah | |
| 2736 | nullopt_t insufficiently constrained | Issaquah | Complete |
| 2738 | is_constructible with void types | Issaquah | Complete |
| 2739 | Issue with time_point non-member subtraction with an unsigned duration | Issaquah | Complete |
| 2740 | constexpr optional | Issaquah | Complete |
| 2742 | Inconsistent string interface taking string_view | Issaquah | Complete |
| 2744 | any's in_place constructors | Issaquah | Complete |
| 2745 | [fund.ts.v2] Implementability of LWG 2451 | Issaquah | |
| 2747 | Possibly redundant std::move in [alg.foreach] | Issaquah | Complete |
| 2748 | swappable traits for optionals | Issaquah | Complete |
| 2749 | swappable traits for variants | Issaquah | Complete |
| 2750 | [fund.ts.v2] LWG 2451 conversion constructor constraint | Issaquah | |
| 2752 | "Throws:" clauses of async and packaged_task are unimplementable | Issaquah | |
| 2755 | [string.view.io] uses non-existent basic_string_view::to_string function | Issaquah | Complete |
| 2756 | C++ WP optional | Issaquah | Complete |
| 2758 | std::string{}.assign("ABCDE", 0, 1) is ambiguous | Issaquah | Complete |
| 2759 | gcd / lcm and bool for the WP | Issaquah | Complete |
| 2760 | non-const basic_string::data should not invalidate iterators | Issaquah | Complete |
| 2765 | Did LWG 1123 go too far? | Issaquah | Complete |
| 2767 | not_fn call_wrapper can form invalid types | Issaquah | Complete |
| 2769 | Redundant const in the return type of any_cast(const any&) | Issaquah | Complete |
| 2771 | Broken Effects of some basic_string::compare functions in terms of basic_string_view | Issaquah | Complete |
| 2773 | Making std::ignore constexpr | Issaquah | Complete |
| 2777 | basic_string_view::copy should use char_traits::copy | Issaquah | Complete |
| 2778 | basic_string_view is missing constexpr | Issaquah | Complete |
| 2260 | Missing requirement for Allocator::pointer | Kona | |
| 2676 | Provide filesystem::path overloads for File-based streams | Kona | |
| 2768 | any_cast and move semantics | Kona | Complete |
| 2769 | Redundant const in the return type of any_cast(const any&) | Kona | Complete |
| 2781 | Contradictory requirements for std::function and std::reference_wrapper | Kona | Complete |
| 2782 | scoped_allocator_adaptor constructors must be constrained | Kona | Complete |
| 2784 | Resolution to LWG 2484 is missing "otherwise, no effects" and is hard to parse | Kona | Complete |
| 2785 | quoted should work with basic_string_view | Kona | Complete |
| 2786 | Annex C should mention shared_ptr changes for array support | Kona | Complete |
| 2787 | §[file_status.cons] doesn't match class definition | Kona | Complete |
| 2788 | basic_string range mutators unintentionally require a default constructible allocator | Kona | Complete |
| 2789 | Equivalence of contained objects | Kona | Complete |
| 2790 | Missing specification of istreambuf_iterator::operator-> | Kona | Complete |
| 2794 | Missing requirements for allocator pointers | Kona | Nothing to do |
| 2795 | §[global.functions] provides incorrect example of ADL use | Kona | Complete |
| 2796 | tuple should be a literal type | Kona | Complete |
| 2801 | Default-constructibility of unique_ptr | Kona | Complete |
| 2802 | shared_ptr constructor requirements for a deleter | Kona | |
| 2804 | Unconditional constexpr default constructor for istream_iterator | Kona | Complete |
| 2806 | Base class of bad_optional_access | Kona | Complete |
| 2807 | std::invoke should use std::is_nothrow_callable | Kona | |
| 2812 | Range access is available with <string_view> | Kona | Complete |
| 2824 | list::sort should say that the order of elements is unspecified if an exception is thrown | Kona | Complete |
| 2826 | string_view iterators use old wording | Kona | Complete |
| 2834 | Resolution LWG 2223 is missing wording about end iterators | Kona | Complete |
| 2835 | LWG 2536 seems to misspecify <tgmath.h> | Kona | |
| 2837 | gcd and lcm should support a wider range of input values | Kona | Complete |
| 2838 | is_literal_type specification needs a little cleanup | Kona | Complete |
| 2842 | in_place_t check for optional::optional(U&&) should decay U | Kona | Complete |
| 2850 | std::function move constructor does unnecessary work | Kona | Complete |
| 2853 | Possible inconsistency in specification of erase in [vector.modifiers] | Kona | Complete |
| 2855 | std::throw_with_nested("string_literal") | Kona | Complete |
| 2857 | {variant,optional,any}::emplace should return the constructed value | Kona | Complete |
| 2861 | basic_string should require that charT match traits::char_type | Kona | Complete |
| 2866 | Incorrect derived classes constraints | Kona | Nothing to do |
| 2868 | Missing specification of bad_any_cast::what() | Kona | Complete |
| 2872 | Add definition for direct-non-list-initialization | Kona | Complete |
| 2873 | Add noexcept to several shared_ptr related functions | Kona | Complete |
| 2874 | Constructor shared_ptr::shared_ptr(Y*) should be constrained | Kona | |
| 2875 | shared_ptr::shared_ptr(Y*, D, […]) constructors should be constrained | Kona | |
| 2876 | shared_ptr::shared_ptr(const weak_ptr<Y>&) constructor should be constrained | Kona | |
| 2878 | Missing DefaultConstructible requirement for istream_iterator default constructor | Kona | |
| 2890 | The definition of 'object state' applies only to class types | Kona | Complete |
| 2900 | The copy and move constructors of optional are not constexpr | Kona | Complete |
| 2903 | The form of initialization for the emplace-constructors is not specified | Kona | |
| 2904 | Make variant move-assignment more exception safe | Kona | Complete |
| 2905 | is_constructible_v<unique_ptr<P, D>, P, D const &> should be false when D is not copy constructible | Kona | Complete |
| 2908 | The less-than operator for shared pointers could do more | Kona | |
| 2911 | An is_aggregate type trait is needed | Kona | Complete |
| 2921 | packaged_task and type-erased allocators | Kona | Complete |
| 2934 | optional<const T> doesn't compare with T | Kona | Complete |
| 2901 | Variants cannot properly support allocators | Toronto | Complete |
| 2955 | to_chars / from_chars depend on std::string | Toronto | Resolved by P0682R1 |
| 2956 | filesystem::canonical() still defined in terms of absolute(p, base) | Toronto | Complete |
Last Updated: 2-Jan-2018