View source for Template:cpp/utility/lang feature macros

{| class="wikitable sortable" style="font-size:90%;"
|-
! style="width:0" | Macro name
! Feature
! Value
! <abbr title="Standard in which the feature is introduced; DR means defect report against that revision">Std</abbr>
! Paper(s)
|- id="cpp_aggregate_bases"
| {{tt|__cpp_aggregate_bases}} || [[cpp/language/aggregate initialization|Aggregate classes]] with base classes || {{c|201603L}} || {{mark c++17}} || {{stddoc|P0017R1}}
|- id="cpp_aggregate_nsdmi"
| {{tt|__cpp_aggregate_nsdmi}} || [[cpp/language/aggregate initialization|Aggregate classes]] with [[cpp/language/data_members#Member initialization|default member initializers]] || {{c|201304L}} || {{mark c++14}} || {{stddoc|N3653}}
|- id="cpp_aggregate_paren_init"
| {{tt|__cpp_aggregate_paren_init}} || [[cpp/language/aggregate initialization|Aggregate initialization]] in the form of [[cpp/language/direct initialization|direct initialization]] || {{c|201902L}} || {{mark c++20}} || {{stddoc|P0960R3}}
|- id="cpp_alias_templates"
| {{tt|__cpp_alias_templates}} || [[cpp/language/type alias|Alias templates]] || {{c|200704L}} || {{mark c++11}} || {{stddoc|N2258}}
|- id="cpp_aligned_new"
| {{tt|__cpp_aligned_new}} || [[cpp/memory/new/align_val_t|Dynamic memory allocation for over-aligned data]] || {{c|201606L}} || {{mark c++17}} || {{stddoc|P0035R4}}
|- id="cpp_attributes"
| {{tt|__cpp_attributes}} || [[cpp/language/attributes|Attributes]] || {{c|200809L}} || {{mark c++11}} || {{stddoc|N2761}}
|- id="cpp_auto_cast"
| {{tt|__cpp_auto_cast}} || [[cpp/language/explicit cast|{{c|auto(x)}} and {{c|auto{x} }}]] || {{c|202110L}} || {{mark c++23}} || {{stddoc|P0849R8}}
|- id="cpp_binary_literals"
| {{tt|__cpp_binary_literals}} || [[cpp/language/integer literal|Binary literals]] || {{c|201304L}} || {{mark c++14}} || {{stddoc|N3472}}
|- id="cpp_capture_star_this"
| {{tt|__cpp_capture_star_this}} || [[cpp/language/lambda#Lambda capture|Lambda capture of *this by value as [=,*this] ]] || {{c|201603L}} || {{mark c++17}} || {{stddoc|P0018R3}}
|- id="cpp_char8_t"
| rowspan="2" | {{tt|__cpp_char8_t}} || {{ltt|cpp/keyword/char8_t}} || {{c|201811L}} || {{mark c++20}} || {{stddoc|P0482R6}}
|-
| {{co|char8_t}} compatibility and portability fix (allow [[cpp/language/aggregate initialization#Character arrays|initialization of (unsigned) char arrays]] from [[cpp/language/string literal|UTF-8 string literals]]) || {{c|202207L}} || {{mark c++20}}<br>{{mark|DR}} || {{stddoc|P2513R4}}
|- id="cpp_concepts"
| rowspan="2" | {{tt|__cpp_concepts}} || [[cpp/language/constraints|Concepts]] || {{c|201907L}} || {{mark c++20}} || {{stddoc|P0734R0}}<br>{{stddoc|P1084R2}}<br>{{stddoc|P1452R2}}
|-
| Conditional trivial special member functions || {{c|202002L}} || {{mark c++20}} || {{stddoc|P0848R3}}<br>{{stddoc|P2493R0}}
|- id="cpp_conditional_explicit"
| {{tt|__cpp_conditional_explicit}} || [[cpp/language/explicit|{{tt|explicit(bool)}}]] || {{c|201806L}} || {{mark c++20}} || {{stddoc|P0892R2}}
|- id="cpp_consteval"
| rowspan="2" | {{tt|__cpp_consteval}} || [[cpp/language/consteval|Immediate functions]] || {{c|201811L}} || {{mark c++20}} || {{stddoc|P1073R3}}
|-
| Making {{tt|consteval}} propagate up || {{c|202211L}} || {{mark c++20}}<br>{{mark|DR}} || {{stddoc|P2564R3}}
|- id="cpp_constexpr"
| rowspan="10" | {{tt|__cpp_constexpr}} || {{ltt|cpp/language/constexpr}} || {{c|200704L}} || {{mark c++11}} || {{stddoc|N2235}}
|-
| [[cpp/language/constexpr#relaxed-constexpr|Relaxed {{tt|constexpr}}]], [[cpp/language/constexpr#constexpr-method-is-const|non-{{tt|const}} {{tt|constexpr}} methods]] || {{c|201304L}} || {{mark c++14}} || {{stddoc|N3652}}
|-
| [[cpp/language/lambda|Constexpr lambda]] || {{c|201603L}} || {{mark c++17}} || {{stddoc|P0170R1}}
|-
| [[cpp/language/virtual|Virtual function]] calls in constant expressions; [[cpp/language/try|{{c/core|try}} blocks]] in {{c/core|constexpr}} functions, {{ltt|cpp/language/dynamic_cast}} and polymorphic {{ltt|cpp/language/typeid}} in constant expressions; trivial [[cpp/language/default initialization|default initialization]] and [[cpp/language/asm|asm-declaration]] in {{c/core|constexpr}} functions || {{c|201907L}} || {{mark c++20}} || {{stddoc|P1064R0}}<br>{{stddoc|P1002R1}}<br>{{stddoc|P1327R1}}<br>{{stddoc|P1331R2}}<br>{{stddoc|P1668R1}}
|-
| Changing the active member of a union in constant evaluation || {{c|202002L}} || {{mark c++20}} || {{stddoc|P1330R0}}<br>{{stddoc|P2493R0}}
|-
| Non-[[cpp/named req/LiteralType|literal]] variables, labels, and {{ltt|cpp/language|goto}} statements in {{c/core|constexpr}} functions || {{c|202110L}} || {{mark c++23}} || {{stddoc|P2242R3}}
|-
| Relaxing some restrictions on [[cpp/language/constexpr|constexpr]] functions and function templates || {{c|202207L}} || {{mark c++23}} || {{stddoc|P2448R2}}
|-
| Permitting static {{c/core|constexpr}} variables in {{c/core|constexpr}} functions || {{c|202211L}} || {{mark c++23}} || {{stddoc|P2647R1}}
|-
| Constexpr cast from {{c|void*}}: towards {{c/core|constexpr}} type-erasure || {{c|202306L}} || {{mark c++26}} || {{stddoc|P2738R1}}
|-
| {{c/core|constexpr}} placement new || {{c|202406L}} || {{mark c++26}} || {{stddoc|P2747R2}}
|- id="cpp_constexpr_dynamic_alloc"
| {{tt|__cpp_constexpr_dynamic_alloc}} || Operations for dynamic storage duration in {{c/core|constexpr}} functions || {{c|201907L}} || {{mark c++20}} || {{stddoc|P0784R7}}
|- id="cpp_constexpr_in_decltype"
| {{tt|__cpp_constexpr_in_decltype}} || Generation of function and variable definitions when [[cpp/language/constant expression#Functions and variables needed for constant evaluation|needed for constant evaluation]] || {{c|201711L}} || {{mark c++11}}<br>{{mark|DR}} || {{stddoc|P0859R0}}
|- id="cpp_constinit"
| {{tt|__cpp_constinit}} || {{ltt|cpp/language/constinit}} || {{c|201907L}} || {{mark c++20}} || {{stddoc|P1143R2}}
|- id="cpp_decltype"
| {{tt|__cpp_decltype}} || {{ltt|cpp/language/decltype}} || {{c|200707L}} || {{mark c++11}} || {{stddoc|N2343}}
|- id="cpp_decltype_auto"
| {{tt|__cpp_decltype_auto}} || [[cpp/language/auto|Return type deduction for normal functions]] || {{c|201304L}} || {{mark c++14}} || {{stddoc|N3638}}
|- id="cpp_deduction_guides"
| rowspan="2" | {{tt|__cpp_deduction_guides}} || [[cpp/language/class template argument deduction|Template argument deduction for class templates]] || {{c|201703L}} || {{mark c++17}} || {{stddoc|P0091R3}}<br>{{stddoc|P0512R0}}<br>{{stddoc|P0620R0}}
|-
| [[cpp/language/class template argument deduction|<abbr title="Class template argument deduction">CTAD</abbr>]] for aggregates and aliases || {{c|201907L}} || {{mark c++20}} || {{stddoc|P1814R0}}<br>{{stddoc|P1816R0}}
|- id="cpp_delegating_constructors"
| {{tt|__cpp_delegating_constructors}} || [[cpp/language/initializer list#Delegating constructor|Delegating constructors]] || {{c|200604L}} || {{mark c++11}} || {{stddoc|N1986}}
|- id="cpp_deleted_function"
| {{tt|__cpp_deleted_function}} || Deleted [[cpp/language/function|function definitions]] with messages ({{c/core|1== delete("should have a reason");}}) || {{c|202403L}} || {{mark c++26}} || {{stddoc|P2573R2}}
|- id="cpp_designated_initializers"
| {{tt|__cpp_designated_initializers}} || [[cpp/language/aggregate initialization#Designated initializers|Designated initializer]] || {{c|201707L}} || {{mark c++20}} || {{stddoc|P0329R4}}
|- id="cpp_enumerator_attributes"
| {{tt|__cpp_enumerator_attributes}} || Attributes for [[cpp/language/enum|enumerators]] || {{c|201411L}} || {{mark c++17}} || {{stddoc|N4266}}
|- id="cpp_explicit_this_parameter"
| {{tt|__cpp_explicit_this_parameter}} || [[cpp/language/member functions#Explicit object member functions|Explicit object parameter]] || {{c|202110L}} || {{mark c++23}} || {{stddoc|P0847R7}}
|- id="cpp_fold_expressions"
| rowspan="2" | {{tt|__cpp_fold_expressions}} || [[cpp/language/fold|Fold expressions]] || {{c|201603L}} || {{mark c++17}} || {{stddoc|N4295}}<br>{{stddoc|P0036R0}}
|-
| Ordering of {{lt|cpp/language/constraints}} involving [[cpp/language/fold|fold expressions]] || {{c|202406L}} || {{mark c++26}} || {{stddoc|P2963R3}}
|- id="cpp_generic_lambdas"
| rowspan="2" | {{tt|__cpp_generic_lambdas}} || [[cpp/language/lambda|Generic lambda expressions]] || {{c|201304L}} || {{mark c++14}} || {{stddoc|N3649}}
|-
| Explicit template parameter list for [[cpp/language/lambda|generic lambdas]] || {{c|201707L}} || {{mark c++20}} || {{stddoc|P0428R2}}
|- id="cpp_guaranteed_copy_elision"
| {{tt|__cpp_guaranteed_copy_elision}} || Guaranteed copy elision through simplified [[cpp/language/value category|value categories]] || {{c|201606L}} || {{mark c++17}} || {{stddoc|P0135R1}}
|- id="cpp_hex_float"
| {{tt|__cpp_hex_float}} || [[cpp/language/floating literal|Hexadecimal floating literals]] || {{c|201603L}} || {{mark c++17}} || {{stddoc|P0245R1}}
|- id="cpp_if_consteval"
| {{tt|__cpp_if_consteval}} || [[cpp/language/if|{{tt|consteval if}}]] || {{c|202106L}} || {{mark c++23}} || {{stddoc|P1938R3}}
|- id="cpp_if_constexpr"
| {{tt|__cpp_if_constexpr}} || [[cpp/language/if|{{tt|constexpr if}}]] || {{c|201606L}} || {{mark c++17}} || {{stddoc|P0292R2}}
|- id="cpp_impl_coroutine"
| {{tt|__cpp_impl_coroutine}} || [[cpp/language/coroutines|Coroutines]] (compiler support) || {{c|201902L}} || {{mark c++20}} || {{stddoc|P0912R5}}<br>{{stddoc|LWG3393}}
|- id="cpp_impl_destroying_delete"
| {{tt|__cpp_impl_destroying_delete}} || [[cpp/memory/new/operator delete|Destroying operator delete]] (compiler support) || {{c|201806L}} || {{mark c++20}} || {{stddoc|P0722R3}}
|- id="cpp_impl_three_way_comparison"
| {{tt|1=__cpp_impl_three_{{br}}way_comparison}} || [[cpp/language/operator comparison#Three-way comparison|Three-way comparison]] (compiler support) || {{c|201907L}} || {{mark c++20}} || {{stddoc|P0515R3}}<br>{{stddoc|P0768R1}}<br>{{stddoc|P1185R2}}<br>{{stddoc|P1630R1}}
|- id="cpp_implicit_move"
| {{tt|__cpp_implicit_move}} || Simpler [[cpp/language/return#Automatic move from local variables and parameters|implicit move]] || {{c|202207L}} || {{mark c++23}} || {{stddoc|P2266R3}}
|- id="cpp_inheriting_constructors"
| rowspan="2" | {{tt|__cpp_inheriting_constructors}} || [[cpp/language/using declaration#Inheriting constructors|Inheriting constructors]] || {{c|200802L}} || {{mark c++11}} || {{stddoc|N2540}}
|-
| Rewording inheriting constructors || {{c|201511L}} || {{mark c++11}}<br>{{mark|DR}} || {{stddoc|P0136R1}}
|- id="cpp_init_captures"
| rowspan="2" | {{tt|__cpp_init_captures}} || [[cpp/language/lambda|Lambda init-capture]] || {{c|201304L}} || {{mark c++14}} || {{stddoc|N3648}}
|-
| Allow pack expansion in [[cpp/language/lambda|lambda]] init-capture || {{c|201803L}} || {{mark c++20}} || {{stddoc|P0780R2}}
|- id="cpp_initializer_lists"
| {{tt|__cpp_initializer_lists}} || [[cpp/language/list initialization|List-initialization]] and {{lc|std::initializer_list}} || {{c|200806L}} || {{mark c++11}} || {{stddoc|N2672}}
|- id="cpp_inline_variables"
| {{tt|__cpp_inline_variables}} || [[cpp/language/inline|Inline variables]] || {{c|201606L}} || {{mark c++17}} || {{stddoc|P0386R2}}
|- id="cpp_lambdas"
| {{tt|__cpp_lambdas}} || [[cpp/language/lambda|Lambda expressions]] || {{c|200907L}} || {{mark c++11}} || {{stddoc|N2927}}
|- id="cpp_modules"
| {{tt|__cpp_modules}} || [[cpp/language/modules|Modules]] || {{c|201907L}} || {{mark c++20}} || {{stddoc|P1103R3}}<br>{{stddoc|P1811R0}}
|- id="cpp_multidimensional_subscript"
| rowspan="2" | {{tt|1=__cpp_multidimensional_{{br}}subscript}} || Multidimensional [[cpp/language/operator member access|subscript operator]] || {{c|202110L}} || {{mark c++23}} || {{stddoc|P2128R6}}
|-
| {{tt|static}} {{ltt|cpp/language/operators|operator[]}} || {{c|202211L}} || {{mark c++23}} || {{stddoc|P2589R1}}
|- id="cpp_named_character_escapes"
| {{tt|__cpp_named_character_escapes}} || Named [[cpp/language/escape|universal character escapes]] || {{c|202207L}} || {{mark c++23}} || {{stddoc|P2071R2}}
|- id="cpp_namespace_attributes"
| {{tt|__cpp_namespace_attributes}} || Attributes for [[cpp/language/namespace|namespaces]] || {{c|201411L}} || {{mark c++17}} || {{stddoc|N4266}}
|- id="cpp_noexcept_function_type"
| {{tt|__cpp_noexcept_function_type}} || Make [[cpp/language/noexcept spec|exception specifications]] be part of the type system || {{c|201510L}} || {{mark c++17}} || {{stddoc|P0012R1}}
|- id="cpp_nontype_template_args"
| rowspan="2" | {{tt|__cpp_nontype_template_args}} || Allow constant evaluation for all [[cpp/language/template parameters#Template non-type arguments|non-type template arguments]] || {{c|201411L}} || {{mark c++17}} || {{stddoc|N4268}}
|-
| Class types and floating-point types in [[cpp/language/template parameters#Non-type template parameter|non-type template parameters]] || {{c|201911L}} || {{mark c++20}} || {{stddoc|P1907R1}}
|- id="cpp_nontype_template_parameter_auto"
| {{tt|1=__cpp_nontype_template_{{br}}parameter_auto}} || Declaring [[cpp/language/template parameters#Non-type template parameter|non-type template parameters]] with {{tt|auto}} || {{c|201606L}} || {{mark c++17}} || {{stddoc|P0127R2}}
|- id="cpp_nsdmi"
| {{tt|__cpp_nsdmi}} || [[cpp/language/data members#Member initialization|Non-static data member initializers]] || {{c|200809L}} || {{mark c++11}} || {{stddoc|N2756}}
|- id="cpp_pack_indexing"
| {{tt|__cpp_pack_indexing}} || [[cpp/language/pack indexing|Pack indexing]] || {{c|202311L}} || {{mark c++26}} || {{stddoc|P2662R3}}
|- id="cpp_placeholder_variables"
| {{tt|__cpp_placeholder_variables}} || A nice placeholder with no name || {{c|202306L}} || {{mark c++26}} || {{stddoc|P2169R4}}
|- id="cpp_range_based_for"
| rowspan="3" | {{tt|__cpp_range_based_for}} || [[cpp/language/range-for|Range-based {{tt|for}} loop]] || {{c|200907L}} || {{mark c++11}} || {{stddoc|N2930}}
|-
| [[cpp/language/range-for#Explanation|Range-based {{tt|for}} loop]] with different {{tt|begin}}/{{tt|end}} types || {{c|201603L}} || {{mark c++17}} || {{stddoc|P0184R0}}
|-
| Lifetime extension in range-based {{tt|for}} || {{c|202211L}} || {{mark c++23}} || {{stddoc|P2644R1}}<br>{{stddoc|P2718R0}}<br>{{stddoc|CWG2659}}
|- id="cpp_raw_strings"
| {{tt|__cpp_raw_strings}} || [[cpp/language/string literal|Raw string literals]] || {{c|200710L}} || {{mark c++11}} || {{stddoc|N2442}}
|- id="cpp_ref_qualifiers"
| {{tt|__cpp_ref_qualifiers}} || [[cpp/language/member functions|ref-qualifiers]] || {{c|200710L}} || {{mark c++11}} || {{stddoc|N2439}}
|- id="cpp_return_type_deduction"
| {{tt|__cpp_return_type_deduction}} || [[cpp/language/auto|Return type deduction for normal functions]] || {{c|201304L}} || {{mark c++14}} || {{stddoc|N3638}}
|- id="cpp_rvalue_references"
| {{tt|__cpp_rvalue_references}} || [[cpp/language/reference|Rvalue reference]] || {{c|200610L}} || {{mark c++11}} || {{stddoc|N2118}}
|- id="cpp_size_t_suffix"
| {{tt|__cpp_size_t_suffix}} || [[cpp/language/integer literal|Literal suffixes for {{tt|size_t}} and its signed version]] || {{c|202011L}} || {{mark c++23}} || {{stddoc|P0330R8}}
|- id="cpp_sized_deallocation"
| {{tt|__cpp_sized_deallocation}} || [[cpp/memory/new/operator delete|Sized deallocation]] || {{c|201309L}} || {{mark c++14}} || {{stddoc|N3778}}
|- id="cpp_static_assert"
| rowspan="3" | {{tt|__cpp_static_assert}} || {{ltt|cpp/language/static_assert}} || {{c|200410L}} || {{mark c++11}} || {{stddoc|N1720}}
|-
| [[cpp/language/static_assert|Single-argument {{tt|static_assert}}]] || {{c|201411L}} || {{mark c++17}} || {{stddoc|N3928}}
|-
| [[cpp/language/static_assert|User-generated {{tt|static_assert}} messages]] || {{c|202306L}} || {{mark c++26}} || {{stddoc|P2741R3}}
|- id="cpp_static_call_operator"
| {{tt|__cpp_static_call_operator}} || {{tt|static}} {{ltt|cpp/language/operators|operator()}} || {{c|202207L}} || {{mark c++23}} || {{stddoc|P1169R4}}
|- id="cpp_structured_bindings"
| rowspan="3" | {{tt|__cpp_structured_bindings}} || [[cpp/language/structured binding|Structured bindings]] || {{c|201606L}} || {{mark c++17}} || {{stddoc|P0217R3}}
|-
| [[cpp/language/attributes|Attributes]] for [[cpp/language/structured binding|structured bindings]] || {{c|202403L}} || {{mark c++26}} || {{stddoc|P0609R3}}
|-
| [[cpp/language/structured binding|Structured bindings]] declaration [[Template:cpp/language/condition|as a condition]] || {{c|202406L}} || {{mark c++26}} || {{stddoc|P0963R3}}
|- id="cpp_template_template_args"
| {{tt|__cpp_template_template_args}} || Matching of [[cpp/language/template parameters#Template template arguments|template template-arguments]] || {{c|201611L}} || {{mark c++17}} || {{stddoc|P0522R0}}
|- id="cpp_threadsafe_static_init"
| {{tt|__cpp_threadsafe_static_init}} || [[cpp/language/storage duration#Static local variables|Dynamic initialization and destruction with concurrency]] || {{c|200806L}} || {{mark c++11}} || {{stddoc|N2660}}
|- id="cpp_unicode_characters"
| {{tt|__cpp_unicode_characters}} || [[cpp/language/types|New character types]] ({{co|char16_t}} and {{co|char32_t}}) || {{c|200704L}} || {{mark c++11}} || {{stddoc|N2249}}
|- id="cpp_unicode_literals"
| {{tt|__cpp_unicode_literals}} || [[cpp/language/string literal|Unicode string literals]] || {{c|200710L}} || {{mark c++11}} || {{stddoc|N2442}}
|- id="cpp_user_defined_literals"
| {{tt|__cpp_user_defined_literals}} || [[cpp/language/user literal|User-defined literals]] || {{c|200809L}} || {{mark c++11}} || {{stddoc|N2765}}
|- id="cpp_using_enum"
| {{tt|__cpp_using_enum}} || {{ltt|cpp/language/enum#Using-enum-declaration|using enum}} || {{c|201907L}} || {{mark c++20}} || {{stddoc|P1099R5}}
|- id="cpp_variable_templates"
| {{tt|__cpp_variable_templates}} || [[cpp/language/variable template|Variable templates]] || {{c|201304L}} || {{mark c++14}} || {{stddoc|N3651}}
|- id="cpp_variadic_friend"
| {{tt|__cpp_variadic_friend}} || Variadic [[cpp/language/friend|friend declarations]] || {{c|202403L}} || {{mark c++26}} || {{stddoc|P2893R3}}
|- id="cpp_variadic_templates"
| {{tt|__cpp_variadic_templates}} || [[cpp/language/parameter pack|Variadic templates]] || {{c|200704L}} || {{mark c++11}} || {{stddoc|N2242}}
|- id="cpp_variadic_using"
| {{tt|__cpp_variadic_using}} || Pack expansions in [[cpp/language/using declaration|{{tt|using}}-declarations]] || {{c|201611L}} || {{mark c++17}} || {{stddoc|P0195R2}}
|-
! colspan="5" | Total number of macros: 70 <!-- update me, e.g., use the script on the talk page -->
|}