cpp17

C++17の対応状況

参照記事

• C++17の新機能予定, 2014年11月
• C++17 progress update! (Oct 2015)
  • MicrosoftのStephan T. Lavavejによる投稿
• What we added to the C++17 working draft
  • Happy with C++17
  • Trip report: C++ meeting at Jacksonville - Jornadas using std::cpp
  • Trip report: Winter ISO C++ standards meeting - Sutter's Mill
• C++ Defect Report Support in Clang
• libc++ C++1z Status
• cplusplus/draftリポジトリのコミットログ
• What the ISO C++ committee added to the C++17 working draft at the Oulu 2016 meeting
  • C++17: will it be great or just ok?
  • Final features of C++17 - Meeting C++
  • Trip report: Summer ISO C++ standards meeting (Oulu) - Sutter's Mill
  • Red Hat at the ISO C++ Standards Meeting (June 2016, Oulu): Core Language
  • Red Hat at the ISO C++ Standards Meeting (June 2016, Oulu): Library
• What are the new features in C++17? - StackOverflow
• Trip Report: C++ Standards Meeting in Issaquah, November 2016 - There's Waldo!
  • The view from Nov 2016 C++ Standard Meeting Issaquah
  • Trip Report: C++ Standards Meeting in Kona, February 2017
  • Trip report: Winter ISO C++ standards meeting (Kona), C++17 is complete - Sutter's Mill
• C++1zの言語拡張まとめ - Faith and Brave - C++で遊ぼう
• C++17 is formally approved - Sutter's Mill

Editor's Report

• N4297 Editor's Report -- Working Draft, Standard for Programming Language C++
• N4432 Editor's Report -- Working Draft, Standard for Programming Language C++
• N4583 Editor's Report -- Working Draft, Standard for Programming Language C++
• N4593 Editor's Report -- Working Draft, Standard for Programming Language C++
• N4603 Editor's Report -- Committee Draft, Standard for Programming Language C++
• N4619 Editors' Report -- Working Draft, Standard for Programming Language C++
• N4661 Editors' Report -- Programming Languages -- C++
• N4688 Editor's Report
• N4714 Editor's Report

言語機能で採択されたもの

コンパイラの実装状況ページにまとめた

• N4262 Wording for Forwarding References

ライブラリで採択されたもの

paper	説明	対応状況(空 or 完了 or 対応しない)
N3911	void_t	完了
N4089	Safe conversions in unique_ptr<T[]>, revision 2	完了
N4169	INVOKEコンセプトに従った関数呼び出しをするinvoke()関数	完了
N4190	非推奨になっていたauto_ptr, random_shuffle, 古い<functional>の機能を削除	完了
N4258	標準ライブラリのnoexcept指定を整理	完了
N4259	std::uncaught_exceptions()	完了
N4277	TriviallyCopyable reference_wrapper	完了
N4279	unique-key mapのインタフェース改善	完了
N4280	コンテナの要素情報にアクセスする非メンバ関数版	完了
N4284	連続イテレータ
N4285	例外仕様と送出式の仕様を整理
N4387	pairとtupleを改善	完了
N4389	bool_constant	完了
N4508	shared_mutex	完了
N4366	unique_ptrのテンプレート代入演算子にSFINAEルールが不足していたので追加	完了
N4510	標準コンテナに不完全型の最小サポートを追加	完了
P0004R1	非推奨だったiostreamsのエイリアスを削除
P0006R0	値を返す型特性クラスのconstexpr変数テンプレート版	完了
P0092R1	<chrono>のdurationとtime_pointに対する丸め演算関数 floor(), ceil(), round()。 およびdurationに対する絶対値関数 abs()	完了
P0007R1	オブジェクトをconstにするas_const()関数	完了
P0156R2	lock_guardの可変引数版としてscoped_lockを新設	完了
P0074R0	owner_lessで任意の要素型を持つshared_ptr同士を比較できるようにする	完了
P0013R1	コンパイル時条件の論理演算を行う型特性 conjunction, disjunction, negationを追加	完了
P0024R2	Parallelism TS	完了 サンプルコードはコンパイラが実装したら適時足す
P0226R1	数学の特殊関数	完了
P0220R1	any	完了
P0220R1	optional	完了
P0220R1	string_view	完了
P0220R1	メモリプール	完了
P0220R1	検索アルゴリズム	完了
P0220R1	サンプリングアルゴリズム	完了
P0220R1	タプルを展開して関数呼び出しするapply関数	完了
P0218R1	Filesystem TS	完了
P0033R1	shared_from_thisの指す先が書き換わらないことを規定	完了
P0005R4	not_fn	完了
P0152R1	constexpr atomic<T>::is_always_lock_free	完了
P0185R1	swap可能かを判定する型特性クラス	完了
P0253R1	検索アルゴリズムインタフェースの設計ミスを修正	完了
P0025R0	値を範囲内に収めるclamp()関数	完了
P0154R1	false sharingとtrue sharingを制御する定数	完了
P0030R1	std::hypot()関数に3引数版のオーバーロードを追加	完了
P0031R0	reverse_iterator, move_iterator, arrayの変更操作とランダムアクセスにconstexprを追加	完了
P0272R1	basic_stringの非const版data()メンバ関数	完了
P0077R2	is_callableとis_nothrow_callable	完了
P0063R3	Cの参照をC99からC11に変更	完了
P0175R1	C互換ライブラリの概要を記載する	完了
P0088R3	variant	完了
P0307R2	optionalの>=比較	完了
P0393R3	variantの>=比較	完了
P0032R3	variantとanyとoptionalを一様のインタフェースにする	完了
P0067R5	ロケール依存なし、フォーマット解析なしの高速な文字列・数値変換	完了
P0254R2	basic_string側にbasic_string_viewをパラメータとして受け取るオーバーロードを追加	完了
P0258R2	has_unique_object_representations型特性	完了
P0040R3	未初期化メモリのアルゴリズムと、デストラクタ呼び出しの関数	完了
P0084R2	emplace_front()とemplace_back()の戻り値として追加した要素への参照を返す	完了
P0302R1	std::functionのアロケータサポートを削除	完了
P0083R3	連想コンテナのsplice	完了
P0163R0	shared_ptr::weak_type	完了
P0209R2	タプルからT型オブジェクトを構築するmake_from_tuple()関数	完了
P0295R0	gcd()とlcm()	完了
P0174R2	std::iteratorを非推奨化	完了
P0174R2	std::allocator<void>の特殊化を非推奨化	完了
P0174R2	std::allocatorの以下のメンバを非推奨化。size_type, difference_type, pointer, const_pointer, reference, const_reference, rebind, address(), allocate()メンバ関数のhintパラメータ, max_size(), construct(), destroy()	完了
P0174R2	std::raw_storage_iteratorを非推奨	完了
P0174R2	get_temporary_buffer()、return_temporary_buffer()を非推奨化	完了
P0174R2	is_literal_typeを非推奨化	完了
P0337R0	polymorphic_allocatorの代入演算子をdelete定義	完了
P0358R1	not_fnの仕様整理	完了
P0219R1	パス同士の関係演算	完了
P0392R0	pathクラスによるstring_viewのアダプト	完了
P0394R4	並列アルゴリズムでのterminate()のハンドリング	完了
P0336R1	並列アルゴリズムの実行ポリシーを名称変更	完了
P0371R1	memory_order_consumeを一時的に非推奨化	完了
P0346R1	乱数ライブラリの言葉づかいを変更。 UniformRandomNumberGenerator を UniformRandomBitGenerator に変更。URNGをURBGに変更	完了
P0180R2	std[0-9]+名前空間を将来のために予約	完了
P0426R0	char_traitsのconstexpr対応	完了
P0403R0	basic_string_viewのリテラル	完了
P0505R0	Chronoライブラリ durationクラスとtime_pointクラスの変更操作をconstexpr対応	完了
P0418R1	atomicメモリオーダーの調整
P0508R0	node_handleの構造化束縛対応	完了
P0414R1, P0497R0	shared_ptrの配列対応	完了
P0504R0	in_placeタグの見直し	完了
P0510R0	variantのテンプレート引数に指定する型として、参照、不完全型、配列を許可しない。および空のvariantを許可しない	完了
P0509R0	例外ハンドリングの制限を更新
P0502R0	並列アルゴリズムからの例外脱出の処理を更新	完了
P0503R0	"literal type"の使い方を正す
P0521R0	shared_ptr::use_count()の仕様を明確化。デバッグでしか使用しないshared_ptr::unique()メンバ関数を非推奨化	完了
P0513R0	hashの特殊化をやめて、文章仕様としてハッシュ化できる条件を記載
P0517R0	future_errorのオブジェクトを作れるようにする	完了
P0435R1	common_typeの問題を修正	完了
P0298R3	std::byte型を追加	完了
P0317R1	Directory entry caching for filesystem	完了
P0492R2	Proposed resolution of C++17 National Body comments for filesystems	完了
P0430R2	File system library on non-POSIX-like operating systems	完了
P0452R1	Unifying <numeric> parallel algorithms	完了
P0518R1	Allowing copies as arguments to function objects given to parallel algorithms	完了
P0523R1	Complexity of parallel algorithms	完了
P0574R1	Algorithm complexity constraints and parallel overloads	完了
P0467R2	Iterator concerns for parallel algorithms	完了
P0623R0	Final C++17 parallel algorithms fixes	完了
P0604R0	Resolving GB 55, US 84, US 85, US 86	完了
P0607R0	inline variables for the standard library	完了
P0618R0	Deprecating <codecvt>	完了
P0599R1	noexcept for hash functions
P0433R2	Integrating template deduction for class templates into the standard library
P0558R1	Resolving atomic<T> named base class inconsistencies	完了
P0548R1	common_type and duration	完了

採択されたCore Issue

CWG DR	説明	対応状況(空 or 完了 or 対応しない)
1274	Common nonterminal for expression and braced-init-list
1391	Conversions to parameter types with non-deduced template arguments
1722	noexcept付きのラムダ式から変換する関数ポインタにnoexceptを付加する	完了
1847	Clarifying compatibility during partial ordering
1863	Requirements on thrown object type to support std::current_exception()
1949	"sequenced after" instead of "sequenced before"
1975	Permissible declarations for exception-specifications
1981	Implicit contextual conversions and explicit
1990	Ambiguity due to optional decl-specifier-seq
2000	header-name outside #include directive
2004	Unions with mutable members in constant expressions
2006	Cv-qualified void types
2015	odr-use of deleted virtual functions
2016	Confusing wording in description of conversion function
2019	Member references omitted from description of storage duration
2024	Dependent types and unexpanded parameter packs
2026	Zero-initialization and constexpr
2027	Unclear requirements for multiple alignas specifiers
2031	Missing incompatibility for &&
2052	Template argument deduction vs overloaded operators
2075	Passing short initializer lists to array reference parameters
2101	Incorrect description of type- and value-dependence
2120	Array as first non-static data member in standard-layout class
1734	Nontrivial deleted copy functions
1895	Deleted conversions in conditional operator operands
1930	init-declarator-list vs member-declarator-list
1932	Bit-field results of conditional operators (no changes, resolved by 1895)
1955	#elif with invalid controlling expression
2001	non-directive is underspecified
2008	Default template-arguments underspecified
2017	Flowing off end is not equivalent to no-expression return (with normative correction, see below)
2082	Referring to parameters in unevaluated operands of default arguments
2084	NSDMIs and deleted union default constructors
2093	Qualification conversion for pointer-to-member handler matching
2099	Inferring the bound of an array static data member
2124	Signature of constructor template
2130	Over-aligned types in new-expressions
2157	Further disambiguation of enumeration elaborated-type-specifier
212	Implicit instantiation is not described clearly enough
238	Precision and accuracy constraints on floating point
242	Interpretation of old-style casts
1284	Should the lifetime of an array be independent of that of its elements?
1315	Restrictions on non-type template arguments in partial specializations
1496	Triviality with deleted and missing default constructors
1638	Declaring an explicit specialization of a scoped enumeration
1872	Instantiations of constexpr templates that cannot appear in constant expressions
1992	new (std::nothrow) int[N] can throw
2012	Lifetime of references
2032	変数テンプレートのデフォルトテンプレート引数	完了
2033	Redundant restriction on partial specialization argument
2038	autoの波括弧初期化による型推論規則について、C++14との非互換をドキュメント化	完了
2039	Constant conversions to bool
2040	trailing-return-type no longer ambiguous
2041	Namespace for explicit class template specialization
2044	decltype(auto) and void
2047	Coordinating “throws anything” specifications
2061	Inline namespace after simplifications
2063	Type/nontype hiding in class scope
2064	Conflicting specifications for dependent decltype-specifiers
2066	Does type-dependent imply value-dependent? (no changes, resolved by 2109)
2068	When can/must a defaulted virtual destructor be defined?
2069	Do destructors have names?
2071	typedef with no declarator
2079	[[ appearing in a balanced-token-seq
2085	Invalid example of adding special member function via default argument
2095	Capturing rvalue references to functions by copy
2096	Constraints on literal unions
2098	Is uncaught_exceptions() per-thread?	完了
2104	Internal-linkage constexpr references and ODR requirements
2106	Unclear restrictions on use of function-type template arguments
2107	Lifetime of temporaries for default arguments in array copying
2109	Value dependence underspecified
2113	Incomplete specification of types for declarators
2122	Glvalues of void type
2129	Non-object prvalues and constant expressions
2140	Lvalue-to-rvalue conversion of std::nullptr_t
2141	Ambiguity in new-expression with elaborated-type-specifier
2146	Scalar object vs memory location in definition of “unsequenced”
2147	Initializer-list arguments and pack deduction
2153	pure-specifier in friend declaration
2154	Ambiguity of pure-specifier
2156	Definition of enumeration declared by using-declaration
2163	Labels in constexpr functions
2167	Non-member references with lifetimes within the current evaluation
2175	Ambiguity with attribute in conversion operator declaration
2176	Destroying the returned object when a destructor throws
2180	Virtual bases in destructors and defaulted assignment operators
1861	Values of a bit-field
2022	Copy elision in constant expressions (example updated to match P0135R1)
2076	List-initialization of arguments for constructor parameters
2091	Deducing reference non-type template arguments
2137	List-initialization from object of same type
2145	Parenthesized declarator in function definition
2171	Triviality of copy constructor with less-qualified parameter
1395	Partial ordering of variadic templates reconsidered
1825	Partial ordering between variadic and non-variadic function templates (no changes, resolved by 1395)
1961	Potentially-concurrent actions within a signal handler
2143	Value-dependency via injected-class-name
2155	Defining classes and enumerations via using-declarations
2271	Aliasing this
2100	Value-dependent address of static data member of class template
2094	Trivial copy/move constructor for class with volatile member
1677	Constant initialization via aggregate initialization
1860	What is a "direct member?"
2174	Unclear rules for friend definitions in templates
2205	Restrictions on use of alignas
2218	Ambiguity and namespace aliases
2201	Cv-qualification of array types
2206	Composite type of object and function pointers
2214	Missing requirement on representation of integer values
2220	Hiding index variable in range-based for
2224	Member subobjects and base-class casts
2259	Unclear context describing ambiguity
2262	Attributes for asm-definition
426	Identically-named variables, one internally and one externally linked, allowed?
727	In-class explicit specializations
1622	Empty aggregate initializer for union (no changes, resolved by 2272)
1710	Missing template keyword in class-or-decltype
2196	Zero-initialization with virtual base classes
2198	Linkage of enumerators
2211	Hiding by lambda captures and parameters
2247	Lambda capture and variable argument list
2248	Problems with sized delete
2251	Unreachable enumeration list-initialization
2268	Unions with mutable members in constant expressions revisited
2272	Implicit initialization of aggregate members of reference type
2276	Dependent noexcept and function type-dependence
P0612R0	NB comment CH 2: volatile
P0613R0	NB comment GB15: Resolution of Core Issue 2011
P0615R0	Renaming for structured bindings	完了
P0620R0	Drafting for class template argument deduction issues
P0270R3	Removing C dependencies from signal handler wording
P0250R3	Wording improvements for initialization and thread ids
	__cplusplusマクロの値を201402Lから201703Lに更新	完了
コミット8baa18c	ECMAScript商標の謝辞を追加
コミット42c5a2c	基準となるLIA-1とIEEE 754の参照を追加

C++17の規格書には入らないが、実際にはC++17に含まれる変更：

CWG DR	説明	対応状況(空 or 完了 or 対応しない)
2253	Unnamed bit-fields and zero-initialization
1523	Point of declaration in range-based for
1704	Type checking in explicit instantiation of variable templates
1728	Type of an explicit instantiation of a variable template (no changes, resolved by 1704)
1836	Use of class type being defined in trailing-return-type
2273	Inheriting constructors vs implicit default constructor
2277	Ambiguity inheriting constructors with default arguments (no changes, resolved by 2273)
2287	Pointer-interconvertibility in non-standard-layout unions
2290	Unclear specification for overload resolution and deleted special member functions
P0702R1	Language support for constructor template argument deduction
P0727R0	Temporary objects vs temporary expressions
2342	Reference reinterpret_cast and pointer-interconvertibility
1862	Determining "corresponding members" for friendship
2177	Placement operator delete and parameter copies
2305	Explicit instantiation of constexpr or inline variable template
2307	Unclear definition of "equivalent to a nontype template parameter"
2313	Redeclaration of structured binding reference variables
2315	What is the "corresponding special member" of a variant member?
2338	Undefined behavior converting to short enums with fixed underlying types

採択されたLibrary Issue

LWG DR	説明	対応状況(空 or 完了 or 対応しない)
1169	num_get not fully compatible with strto*
2072	Unclear wording about capacity of temporary buffers
2101	Some transformation types can produce impossible types
2111	Which unexpected/terminate handler is called from the exception handling runtime?
2119	Missing hash specializations for extended integer types
2127	Move-construction with raw_storage_iterator
2133	Attitude to overloaded comma for iterators
2156	非順序連想コンテナのreserve(n)がn-1個の要素を予約してしまう	完了
2218	Unclear how containers use allocator_traits::construct()
2219	INVOKE-ing a pointer to member with a reference_wrapper as the object expression
2224	Ambiguous status of access to non-live objects
2234	assert()は定数式内での使用を許可すべき	完了
2244	Issue on basic_istream::seekg
2250	Follow-up On Library Issue 2207
2259	Issues in 17.6.5.5 rules for member functions
2273	regex_match ambiguity
2336	is_trivially_constructible/is_trivially_assignable traits are always false
2353	std::nextが制限しすぎ	完了
2367	pair and tuple are not correctly implemented for is_constructible with no args
2380	May <cstdlib> provide long ::abs(long) and long long ::abs(long long)?
2384	Allocator's deallocate function needs better specification
2385	function::assign allocator argument doesn't make sense	完了
2435	reference_wrapper::operator()の備考は役に立たないので削除すべき	対応しない
2447	Allocators and volatile-qualified value types
2462	std::ios_base::failure is overspecified
2466	allocator_traits::max_size()のデフォルト挙動が間違っている	完了
2469	Wrong specification of Requires clause of operator[] for map and unordered_map
2473	basic_filebuf's relation to C FILE semantics
2476	scoped_allocator_adaptor is not assignable
2477	Inconsistency of wordings in std::vector::erase() and std::deque::erase()
2483	throw_with_nested() should use is_final
2484	rethrow_if_nested() is doubly unimplementable
2485	get()関数にconst tuple&&のオーバーロードを追加	完了
2486	mem_fn() should be required to use perfect forwarding
2487	bind() should be const-overloaded, not cv-overloaded
2489	mem_fn() should be noexcept	完了
2492	Clarify requirements for comp
2495	There is no such thing as an Exception Safety element
2192	Validity and return type of std::abs(0u) is unclear
2276	Missing requirement on std::promise::set_exception
2296	std::addressof()をconstexprにすべき	完了
2450	(greater|less|greater_equal|less_equal)<void> do not yield a total order for pointers
2520	N4089 broke initializing unique_ptr<T[]> from a nullptr	完了
2522	[fund.ts.v2] Contradiction in set_default_resource specification
2523	std::promise synopsis shows two set_value_at_thread_exit() for no apparent reason
2537	Constructors for priority_queue taking allocators should call make_heap
2539	[fund.ts.v2] invocation_trait definition definition doesn't work for surrogate call functions
2545	Simplify wording for bind without explicitly specified return type
2557	Logical operator traits are broken in the zero-argument case
2558	[fund.ts.v2] Logical operator traits are broken in the zero-argument case
2559	Error in LWG 2234's resolution
2560	is_constructibleに関数型を適用した場合の仕様が未規定	完了
2565	std::function's move constructor should guarantee nothrow for reference_wrappers and function pointers
2566	Requirements on the first template parameter of container adaptors
2571	§[map.modifiers]/2 imposes nonsensical requirement on insert(InputIterator, InputIterator)
2572	shared_ptr::operator*の備考で、CV修飾されたvoidに対しても正しく適用できるようにした	完了
2574	[fund.ts.v2] std::experimental::function::operator=(F&&) should be constrained
2575	[fund.ts.v2] experimental::function::assign should be removed	完了
2576	istream_iteratorとostream_iteratorは、ポインタの取得にstd::addressof()を使用するべき	対応しない
2577	{shared,unique}_lockはポインタ取得にstd::addressof()を使用すべき	対応しない 説明用変数の事後条件は書いていなかった
2579	Inconsistency wrt Allocators in basic_string assignment vs. basic_string::assign
2581	<type_traits>の変数テンプレートの特殊化を禁止すべき	完了
2582	§[res.on.functions]/2's prohibition against incomplete types shouldn't apply to type traits
2583	basic_string(str, pos)のアロケータを渡す方法がない	完了
2585	forward_list::resize(size_type, const value_type&) effects incorrect
2586	Wrong value category used in scoped_allocator_adaptor::construct()
2590	Aggregate initialization for std::array
2181	Exceptions from seed sequence operations
2309	mutex::lock()はdevice_or_resource_busyを送出すべきではない	完了
2310	Public exposition only member in std::array
2328	Rvalue stream extraction should use perfect forwarding
2393	std::function's Callable definition is broken
2426	Issue about compare_exchange
2436	Comparators for associative containers should always be CopyConstructible
2441	固定幅整数のatomicクラスの別名を提供すべき	完了
2542	Missing const requirements for associative containers
2549	tuple EXPLICIT constructor templates that take tuple parameters end up taking references to temporaries and will create dangling references	完了
2550	非順序連想コンテナのclear()メンバ関数の計算量が、なにに対して線形時間を明記する	対応しない
2667	path::root_directory() description is confusing
2669	recursive_directory_iterator effects refers to non-existent functions
2670	system_complete refers to undefined variable base
2671	Errors in copy
2673	status() effects cannot be implemented as specified
2596	vector::data()はポインタの取得にaddressof()を使用するべき	完了
2674	Bidirectional iterator requirement on path::iterator is very expensive
2683	filesystem::copy() says "no effects" (see below)	完了
2684	priority_queue lacking comparator typedef
2685	shared_ptr deleters must not throw on move construction
2688	clamp misses preconditions and has extraneous condition on result
2689	Parallel versions of std::copy and std::move shouldn't be in order
2698	Effect of assign() on iterators/pointers/references
2706	Error reporting for recursive_directory_iterator::pop() is under-specified
2707	path construction and assignment should have string_type&& overloads
2710	"Effects: Equivalent to ..." doesn't count "Synchronization:" as determined semantics
2687	{inclusive,exclusive}_scan misspecified
2704	recursive_directory_iterator's members should require '*this is dereferenceable'
2711	path is convertible from approximately everything under the sun
2725	filesystem::exists(const path&, error_code&) error reporting	完了
2312	tuple's constructor constraints need to be phrased more precisely
2422	std::numeric_limits<T>::is_moduloの符号あり整数型に対する仕様が間違っている	完了
2709	offsetof is unnecessarily imprecise
2716	Specification of shuffle and sample disallows lvalue URNGs
2718	Parallelism bug in [algorithms.parallel.exec] p2
2719	permissions function should not be noexcept due to narrow contract
2720	permissions function incorrectly specified for symlinks
2721	remove_all has incorrect post conditions
2723	Do directory_iterator and recursive_directory_iterator become the end iterator upon error?
2724	The protected virtual member functions of memory_resource should be private
2726	[recursive_]directory_iterator::increment(error_code&) is underspecified
2727	Parallel algorithms with constexpr specifier
2728	status(p).permissions() and symlink_status(p).permissions() are not specified
2770	tuple_size<const T> specialization breaks decomposition declarations
2062	Effect contradictions w/o no-throw guarantee of std::function swaps
2166	Heap property underspecified?
2221	nullptrに対する出力ストリーム演算子を追加	完了
2223	shrink_to_fitの効果に、イテレータの有効性を記載する	完了
2261	Are containers required to use their pointer type internally?
2394	locale::name specification unclear — what is implementation-defined?
2458	N3778 and new library deallocation signatures	完了
2460	LWG issue 2408 and value categories
2468	Self-move-assignment of library types
2475	Allow overwriting of std::basic_string terminator with charT() to allow cleaner interoperation with legacy APIs
2503	multiline option should be added to syntax_option_type	完了
2510	Tag types should not be DefaultConstructible
2514	Type traits must not be final
2519	Iterator operator-= has gratuitous undefined behaviour
2531	future::get should explicitly state that the shared state is released
2534	Constrain rvalue stream operators (with normative changes, see below)
2536	What should <complex.h> do?
2540	unordered_multimap::insert hint iterator
2544	istreambuf_iterator(basic_streambuf<charT, traits>* s) effects unclear when s is 0
2556	Wide contract for future::share()
2562	Consistent total ordering of pointers by comparison functors
2567	Specification of logical operator traits uses BaseCharacteristic, which is defined only for UnaryTypeTraits and BinaryTypeTraits
2569	conjunction and disjunction requirements are too strict
2578	Iterator requirements should reference iterator traits
2584	<regex> ECMAScript IdentityEscape is ambiguous
2589	match_results can't satisfy the requirements of a container
2591	std::function's member template target() should not lead to undefined behaviour
2598	addressof()が一時オブジェクトに対して動作してしまう	完了
2664	operator/ (and other append) semantics not useful if argument has root
2672	Should is_empty use error_code in its specification?
2676	Provide filesystem::path overloads for "File-based streams"
2678	std::filesystem enum classes overspecified	完了
2679	Inconsistent use of "Effects: Equivalent to"
2680	Add "Equivalent to" to filesystem	完了
2681	filesystem::copy() cannot copy symlinks	完了
2686	Why is std::hash specialized for error_code, but not error_condition?
2694	Application of LWG 436 accidentally deleted definition of "facet"
2696	Interaction between make_shared and enable_shared_from_this is underspecified
2699	Missing restriction in [numeric.requirements]
2712	copy_file(from, to, ...) has a number of unspecified error conditions
2722	equivalent incorrectly specifies throws clause
2729	Missing SFINAE on std::pair::operator=
2732	Questionable specification of path::operator/= and path::append	完了
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
2736	nullopt_t insufficiently constrained	完了
2738	is_constructibleにvoidを適用した場合の仕様が未規定	完了
2739	Issue with time_point non-member subtraction with an unsigned duration
2740	constexpr optional<T>::operator->	完了
2742	Inconsistent string interface taking string_view	完了
2744	any's in_place constructors
2747	Possibly redundant std::move in [alg.foreach]
2748	swappable traits for optionals	完了
2749	swappable traits for variants
2752	Throws: clauses of async and packaged_task are unimplementable
2754	The in_place constructors and emplace functions added by P0032R3 don't require CopyConstructible
2755	[string.view.io] uses non-existent basic_string_view::to_string function	完了
2756	optional<T> should 'forward' T's implicit conversions	完了
2758	std::string{}.assign("ABCDE", 0, 1) is ambiguous	完了
2759	gcd / lcm and bool	完了
2760	non-const basic_string::data should not invalidate iterators
2765	Did LWG 1123 go too far?
2767	not_fn call_wrapper can form invalid types	完了
2771	Broken Effects: of some basic_string::compare functions in terms of basic_string_view	完了
2773	Making std::ignore constexpr
2777	basic_string_view::copy should use char_traits::copy	完了
2778	basic_string_view is missing constexpr	完了
2260	Missing requirement for Allocator::pointer
2768	any_cast and move semantics (no changes, resolved by 2769)
2769	Redundant const in the return type of any_cast(const any&)
2781	Contradictory requirements for std::function and std::reference_wrapper
2782	scoped_allocator_adaptor constructors must be constrained
2784	Resolution to LWG 2484 is missing "otherwise, no effects" and is hard to parse
2785	quoted should work with basic_string_view	完了
2786	Annex C should mention shared_ptr changes for array support
2787	[file_status.cons] doesn't match class definition
2788	basic_string range mutators unintentionally require a default constructible allocator
2789	Equivalence of contained objects
2790	Missing specification of istreambuf
2794	Missing requirements for allocator pointers
2795	[global.functions] provides incorrect example of ADL use
2796	tuple should be a literal type
2804	Unconditional constexpr default constructor for istream_iterator
2806	Base class of bad_optional_access	完了
2807	std::invoke should use std::is_nothrow_callable
2824	list::sort should say that the order of elements is unspecified if an exception is thrown
2826	string_view iterators use old wording	完了
2834	Resolution to LWG 2223 is missing wording about end iterators
2835	Resolution to LWG 2536 seems to misspecify <tgmath.h>
2837	gcd and lcm should support a wider range of input values	完了
2838	is_literal_type specification needs a little cleanup
2842	in_place_t check for optional::optional(U&&) should decay U	完了
2850	std::function move constructor does unnecessary work
2853	Possible inconsistency in specification of erase in [vector.modifiers]
2855	std::throw_with_nested("string_literal")
2866	Incorrect derived classes constraints
2857	{variant,optional,any}::emplace should return the constructed value	optional完了
2868	Missing specification of bad_any_cast::what()	完了
2872	Add definition for "direct-non-list-initialization"
2890	The definition of "object state" applies only to class types
2801	Default-constructibility of unique_ptr	完了
2861	basic_string should require that charT match traits::char_type
2873	shared_ptrの所有権ベース比較の関数にnoexceptを追加	完了
2874	Constructor shared_ptr::shared_ptr(Y*) should be constrained
2875	shared_ptr::shared_ptr(Y* | D | […]) constructors should be constrained
2878	Missing DefaultConstructible requirement for istream_iterator default constructor
2802	shared_ptr constructor requirements for a deleter
2876	shared_ptr::shared_ptr(const weak_ptr<Y>&) constructor should be constrained
2900	The copy and move constructors of optional are not constexpr
2903	The form of initialization for the emplace-constructors is not specified
2904	Make variant move-assignment more exception safe
2905	is_constructible_v<unique_ptr<P | D> | P | D const &> should be false when D is not copy constructible	完了
2908	The less-than operator for shared pointers could do more
2911	An is_aggregate_type trait is needed	完了
2921	packaged_task and type-erased allocators	完了
2934	optional<const T> doesn't compare with T	完了

C++17の規格書には入らないが、実際にはC++17に含まれる変更：

LWG DR	説明	対応状況(空 or 完了 or 対応しない)
2444	Inconsistent complexity for std::sort_heap
2593	Moved-from state of Allocators
2597	std::log misspecified for complex numbers
2783	stack::emplace() and queue::emplace() should return decltype(auto)
2932	Constraints on parallel algorithm implementations are underspecified
2937	Is equivalent("existing_thing", "not_existing_thing") an error?
2940	result_of specification also needs a little cleanup
2942	LWG 2873's resolution missed weak_ptr::owner_before
2954	Specialization of the convenience variable templates should be prohibited
2961	Bad postcondition for set_default_resource	完了
2966	Incomplete resolution of US 74
2974	Diagnose out of bounds tuple_element / variant_alternative
2901	variants cannot properly support allocators
2956	filesystem::canonical() still defined in terms of absolute(p, base)	完了
2952	iterator_traits should work for pointers to cv T	完了
P0682R1	Repairing elementary string conversions
P0739R0	Some improvements to class template argument deduction integration into the standard library	完了
2870	Default value of parameter theta of polar should be dependent
2935	What should create_directories do when p already exists but is not a directory?
2941	[thread.req.timing] wording should apply to both member and namespace-level functions
2944	LWG 2905 accidentally removed requirement that construction of the deleter doesn't throw an exception
2945	Order of template parameters in optional comparisons
2948	unique_ptr does not define operator<< for stream output
2950	std::byte operations are misspecified	完了
2953	LWG 2853 should apply to deque::erase too
2964	Apparently redundant requirement for dynamic_pointer_cast
2965	Non-existing path::native_string() in filesystem_error::what() specification	完了
2972	What is is_trivially_destructible_v<int>?
2976	Dangling uses_allocator specialization for packaged_task
2977	unordered_meow::merge() has incorrect Throws: clause
2978	Hash support for pmr::string and friends
2979	aligned_union should require complete object types	完了
2980	Cannot compare_exchange empty pointers
2981	Remove redundant deduction guides from standard library
2982	Making size_type consistent in associative container deduction guides
2988	Clause 32 cleanup missed one typename
2993	reference_wrapper<T> conversion from T&&	完了
2998	Requirements on function objects passed to {forward_,}list-specific algorithms
3001	weak_ptr::element_type needs remove_extent_t
3024	variant's copies must be deleted instead of disabled via SFINAE
2958	Moves improperly defined as deleted