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std::is_fundamental(3) C++ Standard Libary std::is_fundamental(3) NAME 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. The behavior of a program that adds specializations for is_fundamen- tal or is_fundamental_v (since C++17) is undefined. Template parameters T - a type to check Helper variable template template< class T > (since C++17) inline constexpr bool is_fundamental_v = is_fundamental<T>::value; Inherited from std::integral_constant Member constants value true if T is a fundamental 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> Possible implementation template< class T > struct is_fundamental : std::integral_constant< bool, std::is_arithmetic<T>::value || std::is_void<T>::value || std::is_same<std::nullptr_t, typename std::re- move_cv<T>::type>::value // you can also use 'std::is_null_pointer<T>::value' instead in C++14 > {}; Example // Run this code #include <iostream> #include <type_traits> class A {}; int main() { std::cout << std::boolalpha; std::cout << "A\t" << std::is_fundamental<A>::value << '\n'; std::cout << "int\t" << std::is_fundamental<int>::value << '\n'; std::cout << "int&\t" << std::is_fundamental<int&>::value << '\n'; std::cout << "int*\t" << std::is_fundamental<int*>::value << '\n'; std::cout << "float\t" << std::is_fundamental<float>::value << '\n'; std::cout << "float&\t" << std::is_fundamental<float&>::value << '\n'; std::cout << "float*\t" << std::is_fundamental<float*>::value << '\n'; } Output: A false int true int& false int* false float true float& false float* false See also is_compound checks if a type is a compound type (C++11) (class template) is_arithmetic checks if a type is an arithmetic type (C++11) (class template) is_void checks if a type is void (C++11) (class template) is_null_pointer checks if a type is std::nullptr_t (C++14) (class template) http://cppreference.com 2022.07.31 std::is_fundamental(3)
NAME | Synopsis | Template parameters | Member constants | Member functions | Member types | Possible implementation | Example | Output: | See also
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