C++ Standard Library Issues List (Revision R100)

Index by Section

Reference ISO/IEC IS 14882:2011(E)

This document is the Index by Section for the Library Active Issues List.

Index by Section (non-Ready active issues only)

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Revised 2016-10-17 at 04:10:06 UTC

Section 1 (1 issues)

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Issue Status Section Title Proposed Resolution Priority Duplicates
2506 New 1.10 [intro.multithread] Underspecification of atomics No 3

Section 17 (19 issues)

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Issue Status Section Title Proposed Resolution Priority Duplicates
1173 Open 17 [library] "Equivalence" wishy-washiness No 3
877 LEWG 17 [library] to throw() or to Throw: Nothing. Yes
2392 New 17.3.16 [defns.ntcts] "character type" is used but not defined No 3
2136 Open 17.5.1 [structure] Postconditions vs. exceptions No 3
2679 Tentatively Ready 17.5.1.4 [structure.specifications] Inconsistent Use of Effects and Equivalent To Yes 3
2292 New 17.5.1.4 [structure.specifications] Find a better phrasing for "shall not participate in overload resolution" No 3
2692 Tentatively NAD 17.5.2.1.3 [bitmask.types] Overspecification of lvalueness of bitmask elements No 3
2146 Open 17.6.3.1 [utility.arg.requirements] Are reference types Copy/Move-Constructible/Assignable or Destructible? No 2
2152 LEWG 17.6.3.2 [swappable.requirements] Instances of standard container types are not swappable Yes 2
2114 Open 17.6.3.3 [nullablepointer.requirements] Incorrect "contextually convertible to bool" requirements Yes 3
2461 New 17.6.3.5 [allocator.requirements] Interaction between allocators and container exception safety guarantees No 3
2178 Open 17.6.3.5 [allocator.requirements] Allocator requirement changes not mentioned Annex C No 3
2260 Open 17.6.3.5 [allocator.requirements] Missing requirement for Allocator::pointer No 3
2593 LEWG 17.6.3.5 [allocator.requirements] Moved-from state of Allocators Yes 4
2139 Open 17.6.4.2.1 [namespace.std] What is a user-defined type? Yes 4
2468 Tentatively Ready 17.6.4.9 [res.on.arguments] Self-move-assignment of library types Yes 2
2563 New 17.6.5.5 [member.functions] LWG 2259 relaxes requirements, perhaps unintentionally No 2
2695 New 17.6.5.5 [member.functions] "As if" unclear in [member.functions] No 3
2414 Open 17.6.5.8 [reentrancy] Member function reentrancy should be implementation-defined Yes 3

Section 18 (16 issues)

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Issue Status Section Title Proposed Resolution Priority Duplicates
2248 New 18.3.2 [limits] numeric_limits::is_iec559 misnamed No 4
2730 New 18.3.2.1 [limits.numeric] numeric_limits primary template definition No 3
2764 New 18.4.1 [cstdint.syn] Are <cstddint> macros optional? No 3
2510 Tentatively Ready 18.6 [support.dynamic] Tag types should not be DefaultConstructible Yes 2
2368 Open 18.6.2 [new.delete] Replacing global operator new No 2
2737 New 18.6.2.1 [new.delete.single] Consider relaxing object size restrictions for single-object allocation functions No 3
2303 New 18.6.2.3 [new.delete.placement] Explicit instantiation of std::vector<UserType> broken? No 3
2508 New 18.6.2.4 [new.delete.dataraces] §[new.delete.dataraces] wording needs to be updated No 3
2398 Open 18.7.2 [type.info] type_info's destructor shouldn't be required to be virtual Yes 3
2088 Open 18.8.4 [exception.terminate] std::terminate problem No 3
2784 New 18.8.7 [except.nested] Resolution to LWG 2484 is missing "otherwise, no effects" and is hard to parse Yes
2453 New 18.9 [support.initlist] §[iterator.range] and now [iterator.container] aren't available via <initializer_list> No 3
2493 New 18.9 [support.initlist] initializer_list supports incomplete classes No 4
2432 EWG 18.9 [support.initlist] initializer_list assignability Yes 2
2155 Open 18.10 [support.runtime] Macro __bool_true_false_are_defined should be removed Yes 4
2241 Tentatively Resolved 18.10 [support.runtime] <cstdalign> and #define of alignof No 2

Section 19 (2 issues)

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Issue Status Section Title Proposed Resolution Priority Duplicates
2413 New 19.3 [assertions] assert macro is overconstrained No 4
2686 Tentatively Ready 19.5.1 [system_error.syn] Why is std::hash specialized for error_code, but not error_condition? Yes 3

Section 20 (82 issues)

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Issue Status Section Title Proposed Resolution Priority Duplicates
1289 LEWG 20.2 [utility] Generic casting requirements for smart pointers Yes
2153 LEWG 20.2.2 [utility.swap] Narrowing of the non-member swap contract Yes 2
2599 New 20.2.6 [declval] Library incomplete type permission phrase is unclear No 3
2729 Tentatively Ready 20.4.2 [pairs.pair] Missing SFINAE on std::pair::operator= Yes 2
2289 Open 20.4.2 [pairs.pair] constexpr guarantees of defaulted functions still insufficient Yes 3
2766 New 20.4.3 [pairs.spec] Swapping non-swappable types Yes 3
2773 Tentatively Ready 20.5.1 [tuple.general] Making std::ignore constexpr Yes 0
2446 LEWG 20.5.1 [tuple.general] Unspecialized std::tuple_size should be defined Yes
2528 New 20.5.2.1 [tuple.cnstr] Order of std::tuple construction unspecified No 3
2419 LEWG 20.5.2.1 [tuple.cnstr] Clang's libc++ extension to std::tuple No
1201 LEWG 20.5.2.4 [tuple.creation] Do we always want to unwrap ref-wrappers in make_tuple Yes
2770 Open 20.5.2.6 [tuple.helper] tuple_size<const T> specialization is not SFINAE compatible and breaks decomposition declarations Yes 1
2472 New 20.5.2.8 [tuple.rel] Heterogeneous comparisons in the standard library can result in ambiguities No 3
532 LEWG 20.5.2.8 [tuple.rel] Tuple comparison Yes 348
2756 Tentatively Ready 20.6.3 [optional.object] C++ WP optional<T> should 'forward' T's implicit conversions Yes 1
2746 New 20.6.3 [optional.object] Inconsistency between requirements for emplace between optional and variant No 3
2753 Tentatively Ready 20.6.3.1 [optional.object.ctor] Optional's constructors and assignments need constraints Yes 0
2748 Tentatively Ready 20.6.3.4 [optional.object.swap] swappable traits for optionals Yes 0
2740 Tentatively Ready 20.6.3.5 [optional.object.observe] constexpr optional<T>::operator-> Yes 0
2736 Tentatively Ready 20.6.4 [optional.nullopt] nullopt_t insufficiently constrained Yes 2
2749 Tentatively Ready 20.7.2.6 [variant.swap] swappable traits for variants Yes 1
2744 Tentatively Ready 20.8.3.1 [any.cons] any's in_place constructors Yes 0
2754 Tentatively Ready 20.8.3.1 [any.cons] The in_place constructors and emplace functions added by P0032R3 don't require CopyConstructible Yes 1
2768 Tentatively Ready 20.8.4 [any.nonmembers] any_cast and move semantics Yes 0
2769 Open 20.8.4 [any.nonmembers] Redundant const in the return type of any_cast(const any&) Yes 0
2348 Open 20.9 [template.bitset] charT('1') is not the wide equivalent of '1' Yes 3
1112 LEWG 20.9 [template.bitset] bitsets and new style for loop Yes
2421 New 20.10.5 [ptr.align] Non-specification of handling zero size in std::align [ptr.align] No 3
2089 EWG 20.10.9.1 [allocator.members] std::allocator::construct should use uniform initialization Yes 2
2598 Tentatively Ready 20.10.10.1 [specialized.addressof] addressof works on temporaries Yes 3
2262 Open 20.11.1.2 [unique.ptr.single] Requirement for unique_ptr<T>::get_deleter()(p) to be able to destroy the unique_ptr Yes 3
933 LEWG 20.11.1.2.5 [unique.ptr.single.modifiers] Unique_ptr defect No
2594 New 20.11.2.2 [util.smartptr.shared] Contradicting definition of empty shared_ptr on shared_ptr(nullptr, d) Yes 3
1031 LEWG 20.11.2.2 [util.smartptr.shared] Need shared_ptr conversion to a unique_ptr No
1406 LEWG 20.11.2.2 [util.smartptr.shared] Support hashing smart-pointers based on owner Yes
2751 New 20.11.2.2.2 [util.smartptr.shared.dest] shared_ptr deleter not specified to observe expired weak_ptr instances No 4
2337 Tentatively NAD 20.11.2.2.5 [util.smartptr.shared.obs] shared_ptr operator*() should not be noexcept No 2
2776 New 20.11.2.2.5 [util.smartptr.shared.obs] shared_ptr unique() and use_count() No 2
2696 Tentatively Ready 20.11.2.2.6 [util.smartptr.shared.create] Interaction between make_shared and enable_shared_from_this is underspecified Yes 2
2070 Open 20.11.2.2.6 [util.smartptr.shared.create] allocate_shared should use allocator_traits<A>::construct Yes 2
2529 Tentatively Resolved 20.11.2.5 [util.smartptr.enab] Assigning to enable_shared_from_this::__weak_this twice No 3
2179 Tentatively Resolved 20.11.2.5 [util.smartptr.enab] enable_shared_from_this and construction from raw pointers No 3
2445 SG1 20.11.2.6 [util.smartptr.shared.atomic] "Stronger" memory ordering No
2782 New 20.13.3 [allocator.adaptor.cnstr] scoped_allocator_adaptor constructors must be constrained Yes
2717 Tentatively NAD 20.13.4 [allocator.adaptor.members] scoped_allocator_adaptor uses forward to do move's job Yes
2511 New 20.13.4 [allocator.adaptor.members] scoped_allocator_adaptor piecewise construction does not require CopyConstructible No 3
2690 LEWG 20.14.3 [func.invoke] invoke<R> Yes
2562 Tentatively Ready 20.14.6 [comparisons] Consistent total ordering of pointers by comparison functors Yes 3
2547 New 20.14.6 [comparisons] Container requirements (and other library text) should say "strict total order", not just "total order" No 3
2491 New 20.14.6 [comparisons] std::less<T*> in constant expression No 3
2767 Tentatively Ready 20.14.9 [func.not_fn] not_fn call_wrapper can form invalid types Yes 0
2062 Tentatively Ready 20.14.12.2 [func.wrap.func] Effect contradictions w/o no-throw guarantee of std::function swaps Yes 2
2370 Tentatively Resolved 20.14.12.2 [func.wrap.func] Operations involving type-erased allocators should not be noexcept in std::function Yes 3
2501 Tentatively Resolved 20.14.12.2 [func.wrap.func] std::function requires POCMA/POCCA Yes 3
2502 Tentatively Resolved 20.14.12.2 [func.wrap.func] std::function does not use allocator::construct Yes 3
2781 New 20.14.12.2.1 [func.wrap.func.con] Contradictory requirements for std::function and std::reference_wrapper Yes
2774 New 20.14.12.2.1 [func.wrap.func.con] std::function construction vs assignment No 3
2591 Tentatively Ready 20.14.12.2.5 [func.wrap.func.targ] std::function's member template target() should not lead to undefined behaviour Yes 3
2543 Tentatively Ready 20.14.14 [unord.hash] LWG 2148 (hash support for enum types) seems under-specified Yes 2
1025 LEWG 20.14.14 [unord.hash] The library should provide more specializations for std::hash No
1317 LEWG 20.14.14 [unord.hash] make_hash Yes
2290 Open 20.15 [meta] Top-level "SFINAE"-based constraints should get a separate definition in Clause 17 Yes 3
1120 LEWG 20.15 [meta] New type trait - remove_all No
2040 LEWG 20.15 [meta] Missing type traits related to is_convertible Yes
2452 Core 20.15 [meta] is_constructible, etc. and default arguments No 3
2514 Tentatively Ready 20.15.1 [meta.rqmts] Type traits must not be final Yes 3
2738 Tentatively Ready 20.15.4.3 [meta.unary.prop] is_constructible with void types Yes
2496 New 20.15.4.3 [meta.unary.prop] Certain hard-to-avoid errors not in the immediate context are not allowed to be triggered by the evaluation of type traits No 3
2358 Open 20.15.4.3 [meta.unary.prop] Apparently-bogus definition of is_empty type trait Yes 3
2077 Open 20.15.4.3 [meta.unary.prop] Further incomplete constraints for type traits No 3
2116 Open 20.15.4.3 [meta.unary.prop] std::swap noexcept(what?) No 3
2460 Tentatively Ready 20.15.7.6 [meta.trans.other] LWG issue 2408 and value categories Yes 2
2763 New 20.15.7.6 [meta.trans.other] common_type_t<void, void> is undefined Yes 2
2465 Open 20.15.7.6 [meta.trans.other] SFINAE-friendly common_type is nearly impossible to specialize correctly and regresses key functionality Yes 2
2567 Tentatively Ready 20.15.8 [meta.logical] Specification of logical operator traits uses BaseCharacteristic, which is defined only for UnaryTypeTraits and BinaryTypeTraits Yes 2
2569 Tentatively Ready 20.15.8 [meta.logical] conjunction and disjunction requirements are too strict Yes 2
2587 Open 20.15.8 [meta.logical] "Convertible to bool" requirement in conjunction and disjunction Yes 3
1121 LEWG 20.16.4 [ratio.arithmetic] Support for multiple arguments Yes
2592 New 20.17.2 [time.syn] Require that chrono::duration_casts from smaller durations to larger durations do not overflow Yes 4
2383 Open 20.17.5.8 [time.duration.literals] Overflow cannot be ill-formed for chrono::duration integer literals No 3
2739 Tentatively Ready 20.17.6.5 [time.point.nonmember] Issue with time_point non-member subtraction with an unsigned duration Yes 0
935 LEWG 20.17.7 [time.clock] clock error handling needs to be specified Yes

Section 21 (17 issues)

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Issue Status Section Title Proposed Resolution Priority Duplicates
2513 New 21.1 [strings.general] Missing requirements for basic_string::value_type No 4
2232 LEWG 21.2.3 [char.traits.specializations] [CD] The char_traits specializations should declare their length(), compare(), and find() members constexpr Yes
2318 New 21.3.1 [basic.string] basic_string's wording has confusing relics from the copy-on-write era No 4
2391 Tentatively Resolved 21.3.1 [basic.string] basic_string is missing non-const data() Yes 3
2760 Tentatively Ready 21.3.1.1 [string.require] non-const basic_string::data should not invalidate iterators Yes
2151 Open 21.3.1.1 [string.require] basic_string<>::swap semantics ignore allocators No 3
2742 Tentatively Ready 21.3.1.2 [string.cons] Inconsistent string interface taking string_view Yes 1
2475 Tentatively Ready 21.3.1.5 [string.access] Allow overwriting of std::basic_string terminator with charT() to allow cleaner interoperation with legacy APIs Yes 3
2758 Tentatively Ready 21.3.1.6.3 [string::assign] std::string{}.assign("ABCDE", 0, 1) is ambiguous Yes 1
2757 Tentatively Resolved 21.3.1.6.4 [string::insert] std::string{}.insert(3, "ABCDE", 0, 1) is ambiguous Yes 1
2771 Tentatively Ready 21.3.1.7.9 [string::compare] Broken Effects of some basic_string::compare functions in terms of basic_string_view Yes 1
2778 Tentatively Ready 21.4 [string.view] basic_string_view is missing constexpr Yes 0
2780 New 21.4 [string.view] basic_string_view::copy is missing constexpr Yes 2
2777 Tentatively Ready 21.4.2.6 [string.view.ops] basic_string_view::copy should use char_traits::copy Yes 0
2755 Tentatively Ready 21.4.4 [string.view.io] §[string.view.io] uses non-existent basic_string_view::to_string function Yes 0
2237 New 21.5 [c.strings] <cuchar> macros No 4
2238 Open 21.5 [c.strings] Problematic iterator-pair constructor of containers No 3

Section 22 (16 issues)

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Issue Status Section Title Proposed Resolution Priority Duplicates
708 LEWG 22 [localization] Locales need to be per thread and updated for POSIX changes No
2694 Tentatively Ready 22.3.1.1.2 [locale.facet] Application of LWG 436 accidentally deleted definition of "facet" Yes 3
2295 New 22.3.1.2 [locale.cons] Locale name when the provided Facet is a nullptr No 3
2394 Tentatively Ready 22.3.1.3 [locale.members] locale::name specification unclear — what is implementation-defined? Yes 3
2478 New 22.3.3.2.2 [conversions.string] Unclear how wstring_convert uses cvtstate No 4
2481 New 22.3.3.2.2 [conversions.string] wstring_convert should be more precise regarding "byte-error string" etc. No 4
2226 LEWG 22.3.3.2.2 [conversions.string] wstring_convert methods do not take allocator instance Yes
2479 New 22.3.3.2.3 [conversions.buffer] Unclear how wbuffer_convert uses cvtstate No 4
2480 New 22.3.3.2.3 [conversions.buffer] Error handling of wbuffer_convert unclear No 4
2381 Open 22.4.2.1.2 [facet.num.get.virtuals] Inconsistency in parsing floating point numbers Yes 2
2702 New 22.4.2.2.2 [facet.num.put.virtuals] num_put::do_put(..., bool) performs ill-formed do_put call No 3
2703 New 22.4.2.2.2 [facet.num.put.virtuals] No provision for fill-padding when boolalpha is set No 3
2117 Open 22.4.2.2.2 [facet.num.put.virtuals] ios_base manipulators should have showgrouping/noshowgrouping No 3
2512 Open 22.4.5.1.2 [locale.time.get.virtuals] Y2K bites; what is an "unambiguous year identifier"? No 4
2691 New 22.4.6.3 [locale.moneypunct] money_base::space and do_put: U+0020 versus fill Yes 3
2507 New 22.5 [locale.stdcvt] codecvt_mode should be a bitmask type No 3

Section 23 (36 issues)

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Issue Status Section Title Proposed Resolution Priority Duplicates
2307 Open 23 [containers] Should the Standard Library use explicit only when necessary? No 2
1242 LEWG 23 [containers] Enable SCARY iterators Yes
2743 New 23.1.1.1 [container.node.overview] p0083r3 node_handle private members missing "exposition only" comment No 3
2261 Tentatively Ready 23.2 [container.requirements] Are containers required to use their 'pointer' type internally? Yes 2
760 Tentatively NAD 23.2 [container.requirements] The emplace issue Yes 2
2269 New 23.2.1 [container.requirements.general] Container iterators and argument-dependent lookup No 4
2321 Open 23.2.1 [container.requirements.general] Moving containers should (usually) be required to preserve iterators Yes 2
1521 LEWG 23.2.1 [container.requirements.general] Requirements on internal pointer representations in containers Yes
2705 New 23.2.3 [sequence.reqmts] Questionable precondition on Sequence containers a.assign(n, t) Yes 3
2206 Open 23.2.3 [sequence.reqmts] Inaccuracy in initializer_list constructor requirements No 3
2772 New 23.2.4 [associative.reqmts] Inconsistency in the insert(node) interface No 2
2362 New 23.2.4 [associative.reqmts] unique, associative emplace() should not move/copy the mapped_type constructor arguments when no insertion happens No 3
2227 Open 23.2.4 [associative.reqmts] Stateful comparison objects in associative containers No 3
2215 Open 23.2.4 [associative.reqmts] (unordered) associative container functors should be CopyConstructible Yes 3
2430 LEWG 23.2.4 [associative.reqmts] Heterogeneous container lookup should be enabled using meta-function instead of nested type No
1041 Tentatively Resolved 23.2.4 [associative.reqmts] Add associative/unordered container functions that allow to extract elements Yes
2540 Tentatively Ready 23.2.5 [unord.req] unordered_multimap::insert hint iterator Yes 3
1175 Open 23.2.5 [unord.req] unordered complexity Yes 3
2198 Open 23.2.5 [unord.req] max_load_factor(z) makes no strong guarantees, but bans useful behavior No 3
2199 Open 23.2.5 [unord.req] unordered containers are required to have an initial max load factor of 1.0 No 3
1188 LEWG 23.2.5 [unord.req] Unordered containers should have a minimum load factor as well as a maximum Yes
2189 Open 23.2.5.1 [unord.req.except] Throwing swap breaks unordered containers' state No 3
2335 New 23.3.7 [array] array<array<int, 3>, 4> should be layout-compatible with int[4][3] No 3
851 LEWG 23.3.7 [array] simplified array construction Yes
2443 Tentatively Resolved 23.3.7 [array] std::array member functions should be constexpr Yes
2157 Open 23.3.7.8 [array.zero] How does std::array<T,0> initialization work when T is not default-constructible? Yes 3
1184 LEWG 23.3.11 [vector] Feature request: dynamic bitset No
2223 Tentatively Ready 23.3.11.3 [vector.capacity] shrink_to_fit effect on iterator validity Yes 2
2158 Open 23.3.11.3 [vector.capacity] Conditional copy/move in std::vector Yes 2
2256 New 23.3.11.5 [vector.modifiers] On vector iterator invalidation No 3
2449 New 23.3.11.5 [vector.modifiers] vector::insert invalidates end()? No 3
2164 Open 23.3.11.5 [vector.modifiers] What are the semantics of vector.emplace(vector.begin(), vector.back())? No 2
1422 LEWG 23.3.12 [vector.bool] vector<bool> iterators are not random access No
839 Tentatively Resolved 23.4 [associative] Maps and sets missing splice operation Yes
2713 New 23.5 [unord] More missing allocator-extended constructors for unordered containers Yes 3
2783 New 23.6.4.1 [queue.defn] stack::emplace() and queue::emplace() should return decltype(auto) Yes

Section 24 (14 issues)

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Issue Status Section Title Proposed Resolution Priority Duplicates
2578 Tentatively Ready 24.2 [iterator.requirements] Iterator requirements should reference iterator traits Yes 3
1213 Open 24.2 [iterator.requirements] Meaning of valid and singular iterator underspecified No 4
2375 New 24.2.1 [iterator.requirements.general] Is [iterator.requirements.general]/9 too broadly applied? No 3
484 LEWG 24.2.3 [input.iterators] Convertible to T No
2035 Open 24.2.4 [output.iterators] Output iterator requirements are broken Yes 3
2038 Open 24.2.4 [output.iterators] Missing definition for incrementable iterator No 3
2519 Tentatively Ready 24.2.7 [random.access.iterators] Iterator operator-= has gratuitous undefined behaviour Yes 2
1320 LEWG 24.3 [iterator.synopsis] Header for iter_swap Yes
2208 Tentatively Resolved 24.5.1 [reverse.iterators] std::reverse_iterator should be a literal type Yes 3
2595 New 24.5.1.1 [reverse.iterator] reverse_iterator::operator[]'s return type revisited Yes 3
1052 LEWG 24.5.1.3.5 [reverse.iter.opref] reverse_iterator::operator-> should also support smart pointers Yes 2775
2366 New 24.6.3 [istreambuf.iterator] istreambuf_iterator end-of-stream equality No 3
2544 Tentatively Ready 24.6.3.2 [istreambuf.iterator.cons] istreambuf_iterator(basic_streambuf<charT, traits>* s) effects unclear when s is 0 Yes 3
2457 New 24.7 [iterator.range] std::begin() and std::end() do not support multi-dimensional arrays correctly No 3

Section 25 (11 issues)

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Issue Status Section Title Proposed Resolution Priority Duplicates
2173 New 25 [algorithms] The meaning of operator + in the description of the algorithms Yes 4
1053 LEWG 25 [algorithms] Unify algorithms with operator and function object variants No
1238 LEWG 25 [algorithms] defining algorithms taking iterator for range No
1282 LEWG 25 [algorithms] A proposal to add std::split algorithm Yes
2747 Tentatively Ready 25.3.4 [alg.foreach] Possibly redundant std::move in [alg.foreach] Yes 0
2242 LEWG 25.4.1 [alg.copy] [uninitialized_]copy_n() defect No 2
2471 LEWG 25.4.1 [alg.copy] copy_n's number of InputIterator increments unspecified No 3
2741 New 25.4.14 [alg.partitions] is_partitioned requirements need updating Yes 3
2267 New 25.5.1.4 [partial.sort.copy] partial_sort_copy underspecified for ranges of two different types No 3
2166 Tentatively Ready 25.5.6 [alg.heap.operations] Heap property underspecified? Yes 3
2444 Open 25.5.6.4 [sort.heap] Inconsistent complexity for std::sort_heap Yes 3

Section 26 (15 issues)

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Issue Status Section Title Proposed Resolution Priority Duplicates
2699 Tentatively Ready 26.3 [numeric.requirements] Missing restriction in [numeric.requirements] Yes 3
2693 New 26.5 [complex.numbers] constexpr for various std::complex arithmetic and value operators No 3
1154 LEWG 26.5 [complex.numbers] complex should accept integral types Yes
1217 LEWG 26.5 [complex.numbers] Quaternion support No
2714 New 26.5.6 [complex.ops] complex stream extraction underspecified Yes 3
2597 New 26.5.8 [complex.transcendentals] std::log misspecified for complex numbers No 3
2154 New 26.6.1.3 [rand.req.urng] What exactly does compile-time complexity imply? No 4
2352 New 26.6.7.1 [rand.util.seedseq] Is a default-constructed std::seed_seq intended to produce a predictable .generate()? No 2
2524 Open 26.6.8.4.2 [rand.dist.pois.exp] generate_canonical can occasionally return 1.0 No 2
2423 New 26.7.5 [template.slice.array] Missing specification slice_array, gslice_array, mask_array, indirect_array copy constructor Yes 4
2115 Open 26.7.8 [template.mask.array] Undefined behaviour for valarray assignments with mask_array index? No 4
2055 LEWG 26.8 [numeric.ops] std::move in std::accumulate and other algorithms No
2759 Tentatively Ready 26.8.13 [numeric.ops.gcd] gcd / lcm and bool for the WP Yes
2735 Tentatively Ready 26.9 [c.math] 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 Yes 3
2294 Tentatively Resolved 26.9 [c.math] <cstdlib> should declare abs(double) Yes 2

Section 27 (37 issues)

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Issue Status Section Title Proposed Resolution Priority Duplicates
423 LEWG 27 [input.output] effects of negative streamsize in iostreams Yes
2765 Tentatively Ready 27.5.3.1.6 [ios::Init] Did LWG 1123 go too far? Yes 0
2600 LEWG 27.5.3.5 [ios.base.storage] ios_base must store inaccessible iostate flags No
2675 New 27.5.3.6 [ios.base.callback] register_callback can fail No 3
2214 Open 27.5.5.2 [basic.ios.cons] Clarify basic_ios::init call restrictions Yes 4
2504 New 27.6.3 [streambuf] basic_streambuf is not an abstract class No 3
255 LEWG 27.6.3 [streambuf] Why do basic_streambuf<>::pbump() and gbump() take an int? Yes
2349 Open 27.7.2.2.1 [istream.formatted.reqmts] Clarify input/output function rethrow behavior Yes 3
2499 Open 27.7.2.2.3 [istream::extractors] operator>>(basic_istream&, CharT*) makes it hard to avoid buffer overflows Yes 2
2243 New 27.7.2.3 [istream.unformatted] istream::putback problem No 3
2498 New 27.7.2.6 [istream.rvalue] operator>>(basic_istream&&, T&&) returns basic_istream&, but should probably return basic_istream&& No 3
2221 Tentatively Ready 27.7.3 [output.streams] No formatted output operator for nullptr Yes 3
2342 New 27.7.3.1 [ostream] User conversion to wchar_t const* or to wchar_t not invoked for operator<< Yes 4
2497 New 27.7.3.4 [ostream::sentry] Use of uncaught_exception() No 3
2534 Tentatively Ready 27.7.3.9 [ostream.rvalue] Constrain rvalue stream operators Yes 3
1203 LEWG 27.7.3.9 [ostream.rvalue] More useful rvalue stream insertion Yes
2286 New 27.8.2.4 [stringbuf.virtuals] stringbuf::underflow() underspecified Yes 4
2121 New 27.8.5.1 [stringstream.cons] app for string streams No 3
2676 Review 27.9 [file.streams] Provide filesystem::path overloads for File-based streams Yes 2
1150 LEWG 27.9.5 [fstream] wchar_t, char16_t and char32_t filenames No
2680 Tentatively Ready 27.10 [filesystems] Add "Equivalent to" to filesystem Yes 2
2668 New 27.10.8 [class.path] path::operator+= is defined, but not operator+ Yes 3
2732 Tentatively Ready 27.10.8.4.3 [path.append] Questionable specification of path::operator/= and path::append Yes 2
2664 Tentatively Ready 27.10.8.4.3 [path.append] operator/ (and other append) semantics not useful if argument has root Yes 2
2734 New 27.10.8.4.4 [path.concat] Questionable specification in [path.concat] No 2
2665 Open 27.10.8.4.5 [path.modifiers] remove_filename() post condition is incorrect Yes 3
2678 Tentatively Ready 27.10.10.1 [enum.file_type] std::filesystem enum classes overspecified Yes 3
2762 LEWG 27.10.12.3 [directory_entry.obs] unique_ptr operator*() should be noexcept Yes 3
2677 Tentatively Resolved 27.10.12.3 [directory_entry.obs] directory_entry::status is not allowed to be cached as a quality-of-implementation issue No 2
2708 Open 27.10.14.1 [rec.dir.itr.members] recursive_directory_iterator::recursion_pending() is incorrectly specified Yes 2
2681 Tentatively Ready 27.10.15.3 [fs.op.copy] filesystem::copy() cannot copy symlinks Yes 2
2682 Open 27.10.15.3 [fs.op.copy] filesystem::copy() won't create a symlink to a directory Yes 2
2712 Tentatively Ready 27.10.15.4 [fs.op.copy_file] copy_file(from, to, ...) has a number of unspecified error conditions Yes 2
2722 Tentatively Ready 27.10.15.13 [fs.op.equivalent] equivalent incorrectly specifies throws clause Yes 3
2663 Tentatively Resolved 27.10.15.14 [fs.op.file_size] Enable efficient retrieval of file size from directory_entry No 2
2672 Tentatively Ready 27.10.15.19 [fs.op.is_empty] Should is_empty use error_code in its specification? Yes 3
2548 Tentatively Resolved 27.11 [c.files] Missing vfscanf from <cstdio> Yes 3

Section 28 (18 issues)

(view all issues)

Issue Status Section Title Proposed Resolution Priority Duplicates
2490 New 28 [re] <regex> needs lots of noexcept No 3
523 LEWG 28 [re] regex case-insensitive character ranges are unimplementable as specified No
2431 New 28.3 [re.req] Missing regular expression traits requirements No 3
2503 Tentatively Ready 28.5.1 [re.synopt] multiline option should be added to syntax_option_type Yes 2
2331 Open 28.5.1 [re.synopt] regex_constants::collate's effects are inaccurately summarized Yes 3
2338 Open 28.7 [re.traits] §[re.traits]/7 expects of locale facets something not guaranteed by [locale.facet]/4 Yes 3
1396 LEWG 28.8 [re.regex] regex should support allocators No 1451
2137 Open 28.8.3 [re.regex.assign] Misleadingly constrained post-condition in the presence of exceptions Yes 3
2589 Tentatively Ready 28.10 [re.results] match_results can't satisfy the requirements of a container Yes 3
2195 Open 28.10 [re.results] Missing constructors for match_results Yes 3
2183 New 28.10.1 [re.results.const] Muddled allocator requirements for match_results constructors No 3
2184 New 28.10.1 [re.results.const] Muddled allocator requirements for match_results assignments No 3
2191 New 28.10.1 [re.results.const] Incorrect specification of match_results(match_results&&) No 4
2216 New 28.11.4 [re.alg.replace] regex_replace(basic_string) allocator handling No 3
2220 New 28.12.2.2 [re.tokiter.comp] Under-specification of operator== for regex_token_iterator No 2
2584 Tentatively Ready 28.13 [re.grammar] <regex> ECMAScript IdentityEscape is ambiguous Yes 2
2546 New 28.13 [re.grammar] Implementability of locale-sensitive UnicodeEscapeSequence matching No 4
2343 Tentatively Resolved 28.13 [re.grammar] Is the value of the ECMA-262 RegExp object's multiline property really false? Yes 2

Section 29 (6 issues)

(view all issues)

Issue Status Section Title Proposed Resolution Priority Duplicates
2236 SG1 29.2 [atomics.syn] kill_dependency unconditionally noexcept No
2265 Open 29.3 [atomics.order] 29.3p9 appears to rule out some acceptable executions No 4
1459 LEWG 29.3 [atomics.order] Overlapping evaluations are allowed No 1458
2715 New 29.5 [atomics.types.generic] What is 'aggregate initialization syntax'? No 3
2424 Tentatively Resolved 29.5 [atomics.types.generic] 29.5 should state that atomic types are not trivially copyable Yes 2
2334 SG1 29.6.5 [atomics.types.operations.req] atomic's default constructor requires "uninitialized" state even for types with non-trivial default-constructor Yes

Section 30 (17 issues)

(view all issues)

Issue Status Section Title Proposed Resolution Priority Duplicates
1484 LEWG 30.3.1 [thread.thread.class] Need a way to join a thread with a timeout No
1488 LEWG 30.4 [thread.mutex] Improve interoperability between the C++0x and C1x threads APIs No
936 LEWG 30.4.1 [thread.mutex.requirements] Mutex type overspecified No 961
961 LEWG 30.4.1 [thread.mutex.requirements] Various threading bugs #11 No 936
1493 LEWG 30.4.1 [thread.mutex.requirements] Add mutex, recursive_mutex, is_locked function No
2363 Open 30.4.1.5.1 [thread.sharedtimedmutex.class] Defect in 30.4.1.4.1 [thread.sharedtimedmutex.class] Yes 2
2731 New 30.4.2.1 [thread.lock.guard] Existence of lock_guard<MutexTypes...>::mutex_type typedef unclear Yes 3
1499 LEWG 30.5 [thread.condition] Condition variables preclude wakeup optimization No
2530 Open 30.6.4 [futures.state] Clarify observable side effects of releasing a shared state No 3
2532 Open 30.6.5 [futures.promise] Satisfying a promise at thread exit Yes 3
2095 LEWG 30.6.5 [futures.promise] promise and packaged_task missing constructors needed for uses-allocator construction Yes 4
2412 SG1 30.6.5 [futures.promise] promise::set_value() and promise::get_future() should not race Yes
2556 Tentatively Ready 30.6.6 [futures.unique_future] Wide contract for future::share() Yes 3
2531 Tentatively Ready 30.6.6 [futures.unique_future] future::get should explicitly state that the shared state is released Yes 3
2752 Tentatively Ready 30.6.8 [futures.async] "Throws:" clauses of async and packaged_task are unimplementable Yes 3
2202 Deferred 30.6.8 [futures.async] Missing allocator support by async No 4
2245 Review 30.6.9.1 [futures.task.members] packaged_task::reset() memory allocation Yes 3

Section 99 (2 issues)

(view all issues)

Issue Status Section Title Proposed Resolution Priority Duplicates
1235 LEWG 99 [rand.concept.dist] Issue with C++0x random number proposal No
2505 Tentatively Resolved 99 [auto.ptr.conv] auto_ptr_ref creation requirements underspecified Yes 4

Section C (1 issues)

(view all issues)

Issue Status Section Title Proposed Resolution Priority Duplicates
2201 New C.5 [diff.library] Missing macro entries from C standard library No 2

Section D (1 issues)

(view all issues)

Issue Status Section Title Proposed Resolution Priority Duplicates
2536 Tentatively Ready D.4 [depr.c.headers] What should <complex.h> do? Yes 2

Section concurr.ts 99 (2 issues)

(view all issues)

Issue Status Section Title Proposed Resolution Priority Duplicates
2697 New 99 [concurr.ts::futures.unique_future] [concurr.ts] Behavior of future/shared_future unwrapping constructor when given an invalid future Yes 2
2533 SG1 99 [concurr.ts::futures.unique_future] [concurr.ts] Constrain threads where future::then can run a continuation No

Section fund.ts.v2 99 (13 issues)

(view all issues)

Issue Status Section Title Proposed Resolution Priority Duplicates
2570 Tentatively Ready 99 [fund.ts.v2::meta.logical] [fund.ts.v2] conjunction and disjunction requirements are too strict No 2
2745 Tentatively Ready 99 [fund.ts.v2::optional.object] [fund.ts.v2] Implementability of LWG 2451 Yes 0
2750 Tentatively Ready 99 [fund.ts.v2::optional.object.ctor] [fund.ts.v2] LWG 2451 conversion constructor constraint Yes 0
2733 Tentatively Ready 99 [fund.ts.v2::numeric.ops.gcd] [fund.ts.v2] gcd / lcm and bool Yes 4
2561 New 99 [fund.ts.v2::optional.object.swap] [fund.ts.v2] Incorrect exception specifications for 'swap' in C++ Extensions for Library Fundamentals No 3
2518 New 99 [fund.ts.v2::propagate_const.algorithms] [fund.ts.v2] Non-member swap for propagate_const should call member swap Yes 3
2564 New 99 [fund.ts.v2::func.wrap.func] [fund.ts.v2] std::experimental::function constructors taking allocator arguments may throw exceptions Yes 3
2521 New 99 [fund.ts.v2::memory.smartptr.weak.const] [fund.ts.v2] weak_ptr's converting move constructor should be modified as well for array support Yes 2
2525 New 99 [fund.ts.v2::func.wrap.func] [fund.ts.v2] get_memory_resource should be const and noexcept Yes 3
2527 New 99 [fund.ts.v2::func.wrap.func.con] [fund.ts.v2] ALLOCATOR_OF for function::operator= has incorrect default Yes 3
2568 Open 99 [fund.ts.v2::meta.logical] [fund.ts.v2] Specification of logical operator traits uses BaseCharacteristic, which is defined only for UnaryTypeTraits and BinaryTypeTraits Yes 2
2588 Open 99 [fund.ts.v2::meta.logical] [fund.ts.v2] "Convertible to bool" requirement in conjunction and disjunction Yes 3
2417 LEWG 99 [fund.ts.v2::optional.relops] [fund.ts.v2] std::experimental::optional::operator< and LessThanComparable requirement No

Section networking.ts 99 (1 issues)

(view all issues)

Issue Status Section Title Proposed Resolution Priority Duplicates
2779 LEWG 99 [networking.ts::buffer.reqmts.mutablebuffersequence] [networking.ts] Relax strict aliasing requirement for user-defined buffer sequence iterators Yes

Section parallel.ts 99 (1 issues)

(view all issues)

Issue Status Section Title Proposed Resolution Priority Duplicates
2541 New 99 [parallel.ts::parallel.alg.overloads] [parallel.ts] Headers for ExecutionPolicy algorithm overloads No 1