Linux Manuals

std::is_move_assignable,std::is_trivially_move_assignable, – std::is_move_assignable,std::is_trivially_move_assignable, Synopsis Defined in header<type_traits> template <class T> (1)(since C++ 11) struct is_move_assignable; template <class T> (2)(since C++ 11) struct is_trivially_move_assignable; template <class T> (3)(since C++ 11) struct is_nothrow_move_assignable; 1) If T is not a referenceable type (i.e., possibly cv-qualified void or a function type with a cv-qualifier-seq or a ref-qualifier), provides a member constant…

std::is_member_pointer – std::is_member_pointer Synopsis Defined in header<type_traits> template <class T> (since C++ 11) struct is_member_pointer; If T is pointer to non-static member object or a pointer to non-static member function, provides the member constant value equal true. For any other type, value is false. Template parameters T – a type to check Helper variable template…

std::is_member_object_pointer – std::is_member_object_pointer Synopsis Defined in header<type_traits> template <class T> (since C++ 11) struct is_member_object_pointer; Checks whether T is a non-static member object. Provides the member constant value which is equal to true, if T is a non-static member object type. Otherwise, value is equal to false. Template parameters T – a type to check…

std::is_member_function_pointer – std::is_member_function_pointer Synopsis Defined in header<type_traits> template <class T> (since C++ 11) struct is_member_function_pointer; Checks whether T is a non-static member function pointer. Provides the member constant value which is equal to true, if T is a non-static member function pointer type. Otherwise, value is equal to false. Template parameters T – a type…

std::is_lvalue_reference – std::is_lvalue_reference Synopsis Defined in header<type_traits> template <class T> (since C++ 11) struct is_lvalue_reference; Checks whether T is a lvalue reference type. Provides the member constant value which is equal to true, if T is a lvalue reference type. Otherwise, value is equal to false. Template parameters T – a type to check Helper…

std::is_literal_type – std::is_literal_type Synopsis Defined in header <type_traits> template< class T > (since C++11) struct is_literal_type; (deprecated in C++17)                                  (removed in C++20) If T satisfies all requirements of LiteralType, provides the member constant value equal true. For any other type, value is false. The behavior is undefined if std::remove_all_extents_t<T> is an incomplete type and not…

std::is_invocable,std::is_invocable_r,std::is_nothrow_invocable,std::is_nothrow_invocable_r – std::is_invocable,std::is_invocable_r,std::is_nothrow_invocable,std::is_nothrow_invocable_r Synopsis Defined in header<type_traits> template <class Fn, class… ArgTypes> (1)(since C++ 17) struct is_invocable; template <class R, class Fn, class… ArgTypes> (2)(since C++ 17) struct is_invocable_r; template <class Fn, class… ArgTypes> (3)(since C++ 17) struct is_nothrow_invocable; template <class R, class Fn, class… ArgTypes> (4)(since C++ 17) struct is_nothrow_invocable_r; 1) Determines whether Fn…

std::is_invocable,std::is_invocable_r,std::is_nothrow_invocable, – std::is_invocable,std::is_invocable_r,std::is_nothrow_invocable, Synopsis Defined in header<type_traits> template <class Fn, class… ArgTypes> (1)(since C++ 17) struct is_invocable; template <class R, class Fn, class… ArgTypes> (2)(since C++ 17) struct is_invocable_r; template <class Fn, class… ArgTypes> (3)(since C++ 17) struct is_nothrow_invocable; template <class R, class Fn, class… ArgTypes> (4)(since C++ 17) struct is_nothrow_invocable_r; 1) Determines whether Fn can…

std::is_integral – std::is_integral Synopsis Defined in header<type_traits> template <class T> (since C++ 11) struct is_integral; Checks whether T is an integral type. Provides the member constant value which is equal to true, if T is the type bool, char, char8_t, char16_t, char32_t, wchar_t, short, int, long, long long, or any implementation-defined extended integer types, including…

std::is_heap_until – std::is_heap_until Synopsis Defined in header <algorithm> template< class RandomIt > (since C++11) RandomIt is_heap_until( RandomIt first, RandomIt last ); (until C++20) template< class RandomIt > (since C++20) constexpr RandomIt is_heap_until( RandomIt first, RandomIt last ); template< class ExecutionPolicy, class RandomIt > (2) (since C++17) RandomIt is_heap_until( ExecutionPolicy&& policy, RandomIt first, RandomIt last );…

std::is_heap – std::is_heap Synopsis Defined in header <algorithm> template< class RandomIt > (since C++11) bool is_heap( RandomIt first, RandomIt last ); (until C++20) template< class RandomIt > (since C++20) constexpr bool is_heap( RandomIt first, RandomIt last ); template< class ExecutionPolicy, class RandomIt > (2) (since C++17) bool is_heap( ExecutionPolicy&& policy, RandomIt first, RandomIt last );…

std::is_fundamental – std::is_fundamental Synopsis Defined in header<type_traits> template <class T> (since C++ 11) struct is_fundamental; If T is a fundamental type (that is, arithmetic type, void, or nullptr_t), provides the member constant value equal true. For any other type, value is false. Template parameters T – a type to check Helper variable template template< class…

std::is_function – std::is_function Synopsis Defined in header<type_traits> template <class T> (since C++ 11) struct is_function; Checks whether T is a function type. Types like std::function, lambdas, classes with overloaded operator() and pointers to functions don’t count as function types. Provides the member constant value which is equal to true, if T is a function type….

std::is_floating_point – std::is_floating_point Synopsis Defined in header<type_traits> template <class T> (since C++ 11) struct is_floating_point; Checks whether T is a floating-point type. Provides the member constant value which is equal to true, if T is the type float, double, long double, including any cv-qualified variants. Otherwise, value is equal to false. Template parameters T –…

std::is_final – std::is_final Synopsis Defined in header<type_traits> template <class T> (since C++ 14) struct is_final; If T is a final class (that is, a class declared with the final_specifier), provides the member constant value equal true. For any other type, value is false. If T is a class type, T shall be a complete type;…

std::is_execution_policy – std::is_execution_policy Synopsis Defined in header<execution> template <class T> (since C++ 17) struct is_execution_policy; Checks whether T is a standard or implementation-defined execution policy type. Provides the member constant value which is equal to true, if T is a_standard_execution_policy_type, or an implementation-defined execution policy type. Otherwise, value is equal to false. The behavior of…

std::is_error_condition_enum<std::errc> – std::is_error_condition_enum<std::errc> Synopsis Defined in header<system_error> template <> (since C++ 11) struct is_error_condition_enum<std::errc> : std::true_type; Specifies that std::errc is an error condition enum. This enables implicit conversion to std::error_condition. Inherited from std::integral_constant Member constants value true          (public static member constant) [static] Member functions               converts the object to bool, returns value operator bool (public member…

std::is_error_code_enum<std::io_errc> – std::is_error_code_enum<std::io_errc> Synopsis Defined in header<ios> template <> (since C++ 11) struct is_error_code_enum<std::io_errc> : public std::true_type { }; This specialization of std::is_error_code_enum informs other library components that values of type std::io_errc are enumerations that hold error codes, which makes them implicitly convertible and assignable to objects of type std::error_code. Inherited from std::integral_constant Member constants…

std::is_eq,std::is_neq,std::is_lt,std::is_gt,std::is_lteq,std::is_gteq – std::is_eq,std::is_neq,std::is_lt,std::is_gt,std::is_lteq,std::is_gteq Synopsis Defined in header <compare> constexpr bool is_eq(std::weak_equality cmp) noexcept; (1) (since C++20) constexpr bool is_neq(std::weak_equality cmp) noexcept; (2) (since C++20) constexpr bool is_lt(std::partial_ordering cmp) noexcept; (3) (since C++20) constexpr bool is_lteq(std::partial_ordering cmp) noexcept; (4) (since C++20) constexpr bool is_gt(std::partial_ordering cmp) noexcept; (5) (since C++20) constexpr bool is_gteq(std::partial_ordering cmp) noexcept (6) (since…

std::is_enum – std::is_enum Synopsis Defined in header<type_traits> template <class T> (since C++ 11) struct is_enum; Checks whether T is an enumeration_type. Provides the member constant value which is equal to true, if T is an enumeration type . Otherwise, value is equal to false. Template parameters T – a type to check Helper variable template…