This header is part of the type support library.
Classes | |
Helper Classes | |
| (C++11)(C++17) | compile-time constant of specified type with specified value (class template) |
true_type | std::integral_constant<bool, true> |
false_type | std::integral_constant<bool, false> |
Primary type categories | |
| (C++11) | checks if a type is void (class template) |
| (C++14) | checks if a type is std::nullptr_t (class template) |
| (C++11) | checks if a type is integral type (class template) |
| (C++11) | checks if a type is floating-point type (class template) |
| (C++11) | checks if a type is an array type (class template) |
| (C++11) | checks if a type is an enumeration type (class template) |
| (C++11) | checks if a type is an union type (class template) |
| (C++11) | checks if a type is a non-union class type (class template) |
| (C++11) | checks if a type is a function type (class template) |
| (C++11) | checks if a type is a pointer type (class template) |
| (C++11) | checks if a type is lvalue reference (class template) |
| (C++11) | checks if a type is rvalue reference (class template) |
| (C++11) | checks if a type is a pointer to a non-static member object (class template) |
| (C++11) | checks if a type is a pointer to a non-static member function (class template) |
Composite type categories | |
| (C++11) | checks if a type is fundamental type (class template) |
| (C++11) | checks if a type is arithmetic type (class template) |
| (C++11) | checks if a type is scalar type (class template) |
| (C++11) | checks if a type is object type (class template) |
| (C++11) | checks if a type is compound type (class template) |
| (C++11) | checks if a type is either lvalue reference or rvalue reference (class template) |
| (C++11) | checks if a type is a pointer to a non-static member function or object (class template) |
Type properties | |
| (C++11) | checks if a type is const-qualified (class template) |
| (C++11) | checks if a type is volatile-qualified (class template) |
| (C++11) | checks if a type is trivial (class template) |
| (C++11) | checks if a type is trivially copyable (class template) |
| (C++11) | checks if a type is standard-layout type (class template) |
| (C++11) | checks if a type is plain-old data (POD) type (class template) |
| (C++11) | checks if a type is literal type (class template) |
| (C++11) | checks if a type is class (but not union) type and has no data (class template) |
| (C++11) | checks if a type is polymorphic class type (class template) |
| (C++11) | checks if a type is abstract class type (class template) |
| (C++11) | checks if a type is signed arithmetic type (class template) |
| (C++11) | checks if a type is unsigned arithmetic type (class template) |
Supported operations | |
| (C++11)(C++11)(C++11) | checks if a type has a constructor for specific arguments (class template) |
| checks if a type has a default constructor (class template) | |
| (C++11)(C++11)(C++11) | checks if a type has a copy constructor (class template) |
| (C++11)(C++11)(C++11) | checks if a type has a move constructor (class template) |
| (C++11)(C++11)(C++11) | checks if a type has a assignment operator for a specific argument (class template) |
| (C++11)(C++11)(C++11) | checks if a type has a copy assignment operator (class template) |
| (C++11)(C++11)(C++11) | checks if a type has a move assignment operator (class template) |
| (C++11)(C++11)(C++11) | checks if a type has a non-deleted destructor (class template) |
| (C++11) | checks if a type has a virtual destructor (class template) |
Property queries | |
| (C++11) | obtains the type's alignment requirements (class template) |
| (C++11) | obtains the number of dimensions of an array type (class template) |
| (C++11) | obtains the size of an array type along a specified dimension (class template) |
Type relationships | |
| (C++11) | checks if two types are the same (class template) |
| (C++11) | checks if a type is derived from the other type (class template) |
| (C++11) | checks if a type can be converted to the other type (class template) |
Const-volatility specifiers | |
| (C++11)(C++11)(C++11) | removes const or/and volatile specifiers from the given type (class template) |
| (C++11)(C++11)(C++11) | adds const or/and volatile specifiers to the given type (class template) |
References | |
| (C++11) | removes reference from the given type (class template) |
| (C++11)(C++11) | adds lvalue or rvalue reference to the given type (class template) |
Pointers | |
| (C++11) | removes pointer from the given type (class template) |
| (C++11) | adds pointer to the given type (class template) |
Sign modifiers | |
| (C++11) | makes the given integral type signed (class template) |
| (C++11) | makes the given integral type unsigned (class template) |
Arrays | |
| (C++11) | removes one extent from the given array type (class template) |
| (C++11) | removes all extents from the given array type (class template) |
Miscellaneous transformations | |
| (C++11) | defines the type suitable for use as uninitialized storage for types of given size (class template) |
| (C++11) | defines the type suitable for use as uninitialized storage for all given types (class template) |
| (C++11) | applies type transformations as when passing a function argument by value (class template) |
| (C++11) | hides a function overload or template specialization based on compile-time boolean (class template) |
| (C++11) | chooses one type or another based on compile-type boolean (class template) |
| (C++11) | deduces the result type of a mixed-mode arithmetic expression (class template) |
| (C++11) | obtains the underlying integer type for a given enumeration type (class template) |
| (C++11) | deduces the return type of a function call expression (class template) |
Synopsis
namespace std {
// helper class:
template <class T, T v> struct integral_constant;
typedef integral_constant<bool, true> true_type;
typedef integral_constant<bool, false> false_type;
// primary type categories:
template <class T> struct is_void;
template <class T> struct is_null_pointer;
template <class T> struct is_integral;
template <class T> struct is_floating_point;
template <class T> struct is_array;
template <class T> struct is_pointer;
template <class T> struct is_lvalue_reference;
template <class T> struct is_rvalue_reference;
template <class T> struct is_member_object_pointer;
template <class T> struct is_member_function_pointer;
template <class T> struct is_enum;
template <class T> struct is_union;
template <class T> struct is_class;
template <class T> struct is_function;
// composite type categories:
template <class T> struct is_reference;
template <class T> struct is_arithmetic;
template <class T> struct is_fundamental;
template <class T> struct is_object;
template <class T> struct is_scalar;
template <class T> struct is_compound;
template <class T> struct is_member_pointer;
// type properties:
template <class T> struct is_const;
template <class T> struct is_volatile;
template <class T> struct is_trivial;
template <class T> struct is_trivially_copyable;
template <class T> struct is_standard_layout;
template <class T> struct is_pod;
template <class T> struct is_literal_type;
template <class T> struct is_empty;
template <class T> struct is_polymorphic;
template <class T> struct is_abstract;
template <class T> struct is_signed;
template <class T> struct is_unsigned;
template <class T, class... Args> struct is_constructible;
template <class T> struct is_default_constructible;
template <class T> struct is_copy_constructible;
template <class T> struct is_move_constructible;
template <class T, class U> struct is_assignable;
template <class T> struct is_copy_assignable;
template <class T> struct is_move_assignable;
template <class T> struct is_destructible;
template <class T, class... Args> struct is_trivially_constructible;
template <class T> struct is_trivially_default_constructible;
template <class T> struct is_trivially_copy_constructible;
template <class T> struct is_trivially_move_constructible;
template <class T, class U> struct is_trivially_assignable;
template <class T> struct is_trivially_copy_assignable;
template <class T> struct is_trivially_move_assignable;
template <class T> struct is_trivially_destructible;
template <class T, class... Args> struct is_nothrow_constructible;
template <class T> struct is_nothrow_default_constructible;
template <class T> struct is_nothrow_copy_constructible;
template <class T> struct is_nothrow_move_constructible;
template <class T, class U> struct is_nothrow_assignable;
template <class T> struct is_nothrow_copy_assignable;
template <class T> struct is_nothrow_move_assignable;
template <class T> struct is_nothrow_destructible;
template <class T> struct has_virtual_destructor;
// type property queries:
template <class T> struct alignment_of;
template <class T> struct rank;
template <class T, unsigned I = 0> struct extent;
// type relations:
template <class T, class U> struct is_same;
template <class Base, class Derived> struct is_base_of;
template <class From, class To> struct is_convertible;
// const-volatile modifications:
template <class T> struct remove_const;
template <class T> struct remove_volatile;
template <class T> struct remove_cv;
template <class T> struct add_const;
template <class T> struct add_volatile;
template <class T> struct add_cv;
template <class T>
using remove_const_t = typename remove_const<T>::type;
template <class T>
using remove_volatile_t = typename remove_volatile<T>::type;
template <class T>
using remove_cv_t = typename remove_cv<T>::type;
template <class T>
using add_const_t = typename add_const<T>::type;
template <class T>
using add_volatile_t = typename add_volatile<T>::type;
template <class T>
using add_cv_t = typename add_cv<T>::type;
// reference modifications:
template <class T> struct remove_reference;
template <class T> struct add_lvalue_reference;
template <class T> struct add_rvalue_reference;
template <class T>
using remove_reference_t = typename remove_reference<T>::type;
template <class T>
using add_lvalue_reference_t = typename add_lvalue_reference<T>::type;
template <class T>
using add_rvalue_reference_t = typename add_rvalue_reference<T>::type;
// sign modifications:
template <class T> struct make_signed;
template <class T> struct make_unsigned;
template <class T>
using make_signed_t = typename make_signed<T>::type;
template <class T>
using make_unsigned_t = typename make_unsigned<T>::type;
// array modifications:
template <class T> struct remove_extent;
template <class T> struct remove_all_extents;
template <class T>
using remove_extent_t = typename remove_extent<T>::type;
template <class T>
using remove_all_extents_t = typename remove_all_extents<T>::type;
// pointer modifications:
template <class T> struct remove_pointer;
template <class T> struct add_pointer;
template <class T>
using remove_pointer_t = typename remove_pointer<T>::type;
template <class T>
using add_pointer_t = typename add_pointer<T>::type;
// other transformations:
template <std::size_t Len,
std::size_t Align = /*default-alignment*/>
struct aligned_storage;
template <class T> struct decay;
template <bool, class T = void> struct enable_if;
template <bool, class T, class F> struct conditional;
template <class... T> struct common_type;
template <class T> struct underlying_type;
template <class> class result_of; // not defined
template <class F, class... ArgTypes> class result_of<F(ArgTypes...)>;
template <std::size_t Len,
std::size_t Align = /*default-alignment*/>
using aligned_storage_t = typename aligned_storage<Len,Align>::type;
template <std::size_t Len, class... Types>
using aligned_union_t = typename aligned_union<Len,Types...>::type;
template <class T>
using decay_t = typename decay<T>::type;
template <bool b, class T = void>
using enable_if_t = typename enable_if<b,T>::type;
template <bool b, class T, class F>
using conditional_t = typename conditional<b,T,F>::type;
template <class... T>
using common_type_t = typename common_type<T...>::type;
template <class T>
using underlying_type_t = typename underlying_type<T>::type;
template <class T>
using result_of_t = typename result_of<T>::type;
} // namespace std Class std::integral_constant
template <class T, T v>
struct integral_constant {
static constexpr T value = v;
typedef T value_type;
typedef integral_constant<T,v> type;
constexpr operator value_type() const noexcept { return value; }
constexpr value_type operator()() const noexcept { return value; } //since c++14
};
typedef integral_constant<bool, true> true_type;
typedef integral_constant<bool, false> false_type;
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