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std::is_compound(3) C++ Standard Libary std::is_compound(3) NAME std::is_compound - std::is_compound Synopsis Defined in header <type_traits> template< class T > (since C++11) struct is_compound; std::is_compound is a UnaryTypeTrait. If T is a compound type (that is, array, function, object pointer, function pointer, member object pointer, member function pointer, reference, class, union, or enumeration, including any cv-qualified variants), provides the mem- ber constant value equal true. For any other type, value is false. If the program adds specializations for std::is_compound or std::is_compound_v, the behavior is undefined. Template parameters T - a type to check Helper variable template template< class T > (since C++17) inline constexpr bool is_compound_v = is_compound<T>::value; Inherited from std::integral_constant Member constants value true if T is a compound type, false otherwise [static] (public static member constant) Member functions operator bool converts the object to bool, returns value (public member function) operator() returns value (C++14) (public member function) Member types Type Definition value_type bool type std::integral_constant<bool, value> Notes Compound types are the types that are constructed from fundamental types. Any C++ type is either fundamental or compound. Possible implementation template<class T> struct is_compound : std::integral_constant<bool, !std::is_fundamen- tal<T>::value> {}; Example // Run this code #include <type_traits> #include <iostream> static_assert(not std::is_compound_v<int>); static_assert(std::is_compound_v<int*>); static_assert(std::is_compound_v<int&>); void f(); static_assert(std::is_compound_v<decltype(f)>); static_assert(std::is_compound_v<decltype(&f)>); static_assert(std::is_compound_v<char[100]>); class C {}; static_assert(std::is_compound_v<C>); union U {}; static_assert(std::is_compound_v<U>); enum struct E { e }; static_assert(std::is_compound_v<E>); static_assert(std::is_compound_v<decltype(E::e)>); struct S { int i : 8; int j; void foo(); }; static_assert(not std::is_compound_v<decltype(S::i)>); static_assert(not std::is_compound_v<decltype(S::j)>); static_assert(std::is_compound_v<decltype(&S::j)>); static_assert(std::is_compound_v<decltype(&S::foo)>); int main() { std::cout << "All checks have passed\n"; } See also is_fundamental checks if a type is a fundamental type (C++11) (class template) is_scalar checks if a type is a scalar type (C++11) (class template) is_object checks if a type is an object type (C++11) (class template) is_array checks if a type is an array type (C++11) (class template) http://cppreference.com 2024.06.10 std::is_compound(3)
NAME | Synopsis | Template parameters | Member constants | Member functions | Member types | Notes | Possible implementation | Example | See also
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