Variable templates for type traits.
Utilities » Metaprogramming
Collaboration diagram for Variable templates for type traits.:

template<typename... _Bn>
constexpr bool | std::conjunction_v
template<typename... _Bn>
constexpr bool | std::disjunction_v
template<typename _Pp >
constexpr bool | std::negation_v
template<typename _Tp >
constexpr bool | std::is_void_v
template<typename _Tp >
constexpr bool | std::is_null_pointer_v
template<typename _Tp >
constexpr bool | std::is_integral_v
template<typename _Tp >
constexpr bool | std::is_floating_point_v
template<typename _Tp >
constexpr bool | std::is_array_v
template<typename _Tp >
constexpr bool | std::is_pointer_v
template<typename _Tp >
constexpr bool | std::is_lvalue_reference_v
template<typename _Tp >
constexpr bool | std::is_rvalue_reference_v
template<typename _Tp >
constexpr bool | std::is_member_object_pointer_v
template<typename _Tp >
constexpr bool | std::is_member_function_pointer_v
template<typename _Tp >
constexpr bool | std::is_enum_v
template<typename _Tp >
constexpr bool | std::is_union_v
template<typename _Tp >
constexpr bool | std::is_class_v
template<typename _Tp >
constexpr bool | std::is_function_v
template<typename _Tp >
constexpr bool | std::is_reference_v
template<typename _Tp >
constexpr bool | std::is_arithmetic_v
template<typename _Tp >
constexpr bool | std::is_fundamental_v
template<typename _Tp >
constexpr bool | std::is_object_v
template<typename _Tp >
constexpr bool | std::is_scalar_v
template<typename _Tp >
constexpr bool | std::is_compound_v
template<typename _Tp >
constexpr bool | std::is_member_pointer_v
template<typename _Tp >
constexpr bool | std::is_const_v
template<typename _Tp >
constexpr bool | std::is_volatile_v
template<typename _Tp >
constexpr bool | std::is_trivial_v
template<typename _Tp >
constexpr bool | std::is_trivially_copyable_v
template<typename _Tp >
constexpr bool | std::is_standard_layout_v
template<typename _Tp >
constexpr bool | std::is_pod_v
template<typename _Tp >
constexpr bool | std::is_literal_type_v
template<typename _Tp >
constexpr bool | std::is_empty_v
template<typename _Tp >
constexpr bool | std::is_polymorphic_v
template<typename _Tp >
constexpr bool | std::is_abstract_v
template<typename _Tp >
constexpr bool | std::is_final_v
template<typename _Tp >
constexpr bool | std::is_signed_v
template<typename _Tp >
constexpr bool | std::is_unsigned_v
template<typename _Tp , typename... _Args>
constexpr bool | std::is_constructible_v
template<typename _Tp >
constexpr bool | std::is_default_constructible_v
template<typename _Tp >
constexpr bool | std::is_copy_constructible_v
template<typename _Tp >
constexpr bool | std::is_move_constructible_v
template<typename _Tp , typename _Up >
constexpr bool | std::is_assignable_v
template<typename _Tp >
constexpr bool | std::is_copy_assignable_v
template<typename _Tp >
constexpr bool | std::is_move_assignable_v
template<typename _Tp >
constexpr bool | std::is_destructible_v
template<typename _Tp , typename... _Args>
constexpr bool | std::is_trivially_constructible_v
template<typename _Tp >
constexpr bool | std::is_trivially_default_constructible_v
template<typename _Tp >
constexpr bool | std::is_trivially_copy_constructible_v
template<typename _Tp >
constexpr bool | std::is_trivially_move_constructible_v
template<typename _Tp , typename _Up >
constexpr bool | std::is_trivially_assignable_v
template<typename _Tp >
constexpr bool | std::is_trivially_copy_assignable_v
template<typename _Tp >
constexpr bool | std::is_trivially_move_assignable_v
template<typename _Tp >
constexpr bool | std::is_trivially_destructible_v
template<typename _Tp , typename... _Args>
constexpr bool | std::is_nothrow_constructible_v
template<typename _Tp >
constexpr bool | std::is_nothrow_default_constructible_v
template<typename _Tp >
constexpr bool | std::is_nothrow_copy_constructible_v
template<typename _Tp >
constexpr bool | std::is_nothrow_move_constructible_v
template<typename _Tp , typename _Up >
constexpr bool | std::is_nothrow_assignable_v
template<typename _Tp >
constexpr bool | std::is_nothrow_copy_assignable_v
template<typename _Tp >
constexpr bool | std::is_nothrow_move_assignable_v
template<typename _Tp >
constexpr bool | std::is_nothrow_destructible_v
template<typename _Tp >
constexpr bool | std::has_virtual_destructor_v
template<typename _Tp >
constexpr size_t | std::alignment_of_v
template<typename _Tp >
constexpr size_t | std::rank_v
template<typename _Tp , unsigned _Idx = 0>
constexpr size_t | std::extent_v
template<typename _Tp , typename _Up >
constexpr bool | std::is_same_v
template<typename _Base , typename _Derived >
constexpr bool | std::is_base_of_v
template<typename _From , typename _To >
constexpr bool | std::is_convertible_v
template<typename _Fn , typename... _Args>
constexpr bool | std::is_invocable_v
template<typename _Fn , typename... _Args>
constexpr bool | std::is_nothrow_invocable_v
template<typename _Ret , typename _Fn , typename... _Args>
constexpr bool | std::is_invocable_r_v
template<typename _Ret , typename _Fn , typename... _Args>
constexpr bool | std::is_nothrow_invocable_r_v

## Detailed Description

The variable `is_foo_v<T>` is a boolean constant with the same value as the type trait `is_foo<T>::value`.

Since
  C++17

## Variable Documentation

## alignment_of_v

template<typename _Tp >

constexpr size_t std::alignment_of_v

inline constexpr

Definition at line 3244 of file type_traits.

## conjunction_v

template<typename... _Bn>

constexpr bool std::conjunction_v

inline constexpr

Definition at line 197 of file type_traits.

## disjunction_v

template<typename... _Bn>

constexpr bool std::disjunction_v

inline constexpr

Definition at line 200 of file type_traits.

## extent_v

template<typename _Tp , unsigned _Idx = 0>

constexpr size_t std::extent_v

inline constexpr

Definition at line 3248 of file type_traits.

## has_virtual_destructor_v

template<typename _Tp >

constexpr bool std::has_virtual_destructor_v

inline constexpr

Definition at line 3241 of file type_traits.

## is_abstract_v

template<typename _Tp >

constexpr bool std::is_abstract_v

inline constexpr

Definition at line 3165 of file type_traits.

## is_arithmetic_v

template<typename _Tp >

constexpr bool std::is_arithmetic_v

inline constexpr

Definition at line 3129 of file type_traits.

## is_array_v

template<typename _Tp >

constexpr bool std::is_array_v

inline constexpr

Definition at line 3103 of file type_traits.

## is_assignable_v

template<typename _Tp , typename _Up >

constexpr bool std::is_assignable_v

inline constexpr

Definition at line 3185 of file type_traits.

## is_base_of_v

template<typename _Base , typename _Derived >

constexpr bool std::is_base_of_v

inline constexpr

Definition at line 3257 of file type_traits.

## is_class_v

template<typename _Tp >

constexpr bool std::is_class_v

inline constexpr

Definition at line 3123 of file type_traits.

## is_compound_v

template<typename _Tp >

constexpr bool std::is_compound_v

inline constexpr

Definition at line 3137 of file type_traits.

## is_const_v

template<typename _Tp >

constexpr bool std::is_const_v

inline constexpr

Definition at line 3141 of file type_traits.

## is_constructible_v

template<typename _Tp , typename... _Args>

constexpr bool std::is_constructible_v

inline constexpr

Definition at line 3173 of file type_traits.

## is_convertible_v

template<typename _From , typename _To >

constexpr bool std::is_convertible_v

inline constexpr

Definition at line 3259 of file type_traits.

## is_copy_assignable_v

template<typename _Tp >

constexpr bool std::is_copy_assignable_v

inline constexpr

Definition at line 3187 of file type_traits.

## is_copy_constructible_v

template<typename _Tp >

constexpr bool std::is_copy_constructible_v

inline constexpr

Definition at line 3179 of file type_traits.

## is_default_constructible_v

template<typename _Tp >

constexpr bool std::is_default_constructible_v

inline constexpr

Definition at line 3176 of file type_traits.

## is_destructible_v

template<typename _Tp >

constexpr bool std::is_destructible_v

inline constexpr

Definition at line 3191 of file type_traits.

## is_empty_v

template<typename _Tp >

constexpr bool std::is_empty_v

inline constexpr

Definition at line 3161 of file type_traits.

## is_enum_v

template<typename _Tp >

constexpr bool std::is_enum_v

inline constexpr

Definition at line 3119 of file type_traits.

## is_final_v

template<typename _Tp >

constexpr bool std::is_final_v

inline constexpr

Definition at line 3167 of file type_traits.

## is_floating_point_v

template<typename _Tp >

constexpr bool std::is_floating_point_v

inline constexpr

Definition at line 3101 of file type_traits.

## is_function_v

template<typename _Tp >

constexpr bool std::is_function_v

inline constexpr

Definition at line 3125 of file type_traits.

## is_fundamental_v

template<typename _Tp >

constexpr bool std::is_fundamental_v

inline constexpr

Definition at line 3131 of file type_traits.

## is_integral_v

template<typename _Tp >

constexpr bool std::is_integral_v

inline constexpr

Definition at line 3099 of file type_traits.

## is_invocable_r_v

template<typename _Ret , typename _Fn , typename... _Args>

constexpr bool std::is_invocable_r_v

inline constexpr

Definition at line 3266 of file type_traits.

## is_invocable_v

template<typename _Fn , typename... _Args>

constexpr bool std::is_invocable_v

inline constexpr

Definition at line 3261 of file type_traits.

## is_literal_type_v

template<typename _Tp >

constexpr bool std::is_literal_type_v

inline constexpr

Definition at line 3158 of file type_traits.

## is_lvalue_reference_v

template<typename _Tp >

constexpr bool std::is_lvalue_reference_v

inline constexpr

Definition at line 3107 of file type_traits.

## is_member_function_pointer_v

template<typename _Tp >

constexpr bool std::is_member_function_pointer_v

inline constexpr

Definition at line 3116 of file type_traits.

## is_member_object_pointer_v

template<typename _Tp >

constexpr bool std::is_member_object_pointer_v

inline constexpr

Definition at line 3113 of file type_traits.

## is_member_pointer_v

template<typename _Tp >

constexpr bool std::is_member_pointer_v

inline constexpr

Definition at line 3139 of file type_traits.

## is_move_assignable_v

template<typename _Tp >

constexpr bool std::is_move_assignable_v

inline constexpr

Definition at line 3189 of file type_traits.

## is_move_constructible_v

template<typename _Tp >

constexpr bool std::is_move_constructible_v

inline constexpr

Definition at line 3182 of file type_traits.

## is_nothrow_assignable_v

template<typename _Tp , typename _Up >

constexpr bool std::is_nothrow_assignable_v

inline constexpr

Definition at line 3229 of file type_traits.

## is_nothrow_constructible_v

template<typename _Tp , typename... _Args>

constexpr bool std::is_nothrow_constructible_v

inline constexpr

Definition at line 3217 of file type_traits.

## is_nothrow_copy_assignable_v

template<typename _Tp >

constexpr bool std::is_nothrow_copy_assignable_v

inline constexpr

Definition at line 3232 of file type_traits.

## is_nothrow_copy_constructible_v

template<typename _Tp >

constexpr bool std::is_nothrow_copy_constructible_v

inline constexpr

Definition at line 3223 of file type_traits.

## is_nothrow_default_constructible_v

template<typename _Tp >

constexpr bool std::is_nothrow_default_constructible_v

inline constexpr

Definition at line 3220 of file type_traits.

## is_nothrow_destructible_v

template<typename _Tp >

constexpr bool std::is_nothrow_destructible_v

inline constexpr

Definition at line 3238 of file type_traits.

## is_nothrow_invocable_r_v

template<typename _Ret , typename _Fn , typename... _Args>

constexpr bool std::is_nothrow_invocable_r_v

inline constexpr

Definition at line 3269 of file type_traits.

## is_nothrow_invocable_v

template<typename _Fn , typename... _Args>

constexpr bool std::is_nothrow_invocable_v

inline constexpr

Definition at line 3263 of file type_traits.

## is_nothrow_move_assignable_v

template<typename _Tp >

constexpr bool std::is_nothrow_move_assignable_v

inline constexpr

Definition at line 3235 of file type_traits.

## is_nothrow_move_constructible_v

template<typename _Tp >

constexpr bool std::is_nothrow_move_constructible_v

inline constexpr

Definition at line 3226 of file type_traits.

## is_null_pointer_v

template<typename _Tp >

constexpr bool std::is_null_pointer_v

inline constexpr

Definition at line 3097 of file type_traits.

## is_object_v

template<typename _Tp >

constexpr bool std::is_object_v

inline constexpr

Definition at line 3133 of file type_traits.

## is_pod_v

template<typename _Tp >

constexpr bool std::is_pod_v

inline constexpr

Definition at line 3155 of file type_traits.

## is_pointer_v

template<typename _Tp >

constexpr bool std::is_pointer_v

inline constexpr

Definition at line 3105 of file type_traits.

## is_polymorphic_v

template<typename _Tp >

constexpr bool std::is_polymorphic_v

inline constexpr

Definition at line 3163 of file type_traits.

## is_reference_v

template<typename _Tp >

constexpr bool std::is_reference_v

inline constexpr

Definition at line 3127 of file type_traits.

## is_rvalue_reference_v

template<typename _Tp >

constexpr bool std::is_rvalue_reference_v

inline constexpr

Definition at line 3110 of file type_traits.

## is_same_v

template<typename _Tp , typename _Up >

constexpr bool std::is_same_v

inline constexpr

Definition at line 3254 of file type_traits.

## is_scalar_v

template<typename _Tp >

constexpr bool std::is_scalar_v

inline constexpr

Definition at line 3135 of file type_traits.

## is_signed_v

template<typename _Tp >

constexpr bool std::is_signed_v

inline constexpr

Definition at line 3169 of file type_traits.

## is_standard_layout_v

template<typename _Tp >

constexpr bool std::is_standard_layout_v

inline constexpr

Definition at line 3150 of file type_traits.

## is_trivial_v

template<typename _Tp >

constexpr bool std::is_trivial_v

inline constexpr

Definition at line 3145 of file type_traits.

## is_trivially_assignable_v

template<typename _Tp , typename _Up >

constexpr bool std::is_trivially_assignable_v

inline constexpr

Definition at line 3205 of file type_traits.

## is_trivially_constructible_v

template<typename _Tp , typename... _Args>

constexpr bool std::is_trivially_constructible_v

inline constexpr

Definition at line 3193 of file type_traits.

## is_trivially_copy_assignable_v

template<typename _Tp >

constexpr bool std::is_trivially_copy_assignable_v

inline constexpr

Definition at line 3208 of file type_traits.

## is_trivially_copy_constructible_v

template<typename _Tp >

constexpr bool std::is_trivially_copy_constructible_v

inline constexpr

Definition at line 3199 of file type_traits.

## is_trivially_copyable_v

template<typename _Tp >

constexpr bool std::is_trivially_copyable_v

inline constexpr

Definition at line 3147 of file type_traits.

## is_trivially_default_constructible_v

template<typename _Tp >

constexpr bool std::is_trivially_default_constructible_v

inline constexpr

Definition at line 3196 of file type_traits.

## is_trivially_destructible_v

template<typename _Tp >

constexpr bool std::is_trivially_destructible_v

inline constexpr

Definition at line 3214 of file type_traits.

## is_trivially_move_assignable_v

template<typename _Tp >

constexpr bool std::is_trivially_move_assignable_v

inline constexpr

Definition at line 3211 of file type_traits.

## is_trivially_move_constructible_v

template<typename _Tp >

constexpr bool std::is_trivially_move_constructible_v

inline constexpr

Definition at line 3202 of file type_traits.

## is_union_v

template<typename _Tp >

constexpr bool std::is_union_v

inline constexpr

Definition at line 3121 of file type_traits.

## is_unsigned_v

template<typename _Tp >

constexpr bool std::is_unsigned_v

inline constexpr

Definition at line 3171 of file type_traits.

## is_void_v

template<typename _Tp >

constexpr bool std::is_void_v

inline constexpr

Definition at line 3095 of file type_traits.

## is_volatile_v

template<typename _Tp >

constexpr bool std::is_volatile_v

inline constexpr

Definition at line 3143 of file type_traits.

## negation_v

template<typename _Pp >

constexpr bool std::negation_v

inline constexpr

Definition at line 203 of file type_traits.

## rank_v

template<typename _Tp >

constexpr size_t std::rank_v

inline constexpr

Definition at line 3246 of file type_traits.