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std::is_fundamental

From cppreference.com
< cpp‎ | types
 
 
 
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is_fundamental
(C++11)
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Defined in header <type_traits>
template< class T >
struct is_fundamental;
(since C++11)

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.

Contents

Inherited from std::integral_constant

Member constants

value
[static]
true if T is a fundamental type , false otherwise
(public static member constant)

Member functions

operator bool
converts the object to bool, returns value
(public member function)
operator()
(C++14)
returns value
(public member function)

Member types

Type Definition
value_type bool
type std::integral_constant<bool, value>
[edit template]

[edit] 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::remove_cv<T>::type>::value
> {};

[edit] Example

#include <iostream>
#include <type_traits>
 
class A {};
 
int main() 
{
    std::cout << std::boolalpha;
    std::cout << std::is_fundamental<A>::value << '\n';
    std::cout << std::is_fundamental<int>::value << '\n';
    std::cout << std::is_fundamental<int&>::value << '\n';
    std::cout << std::is_fundamental<int*>::value << '\n';
    std::cout << std::is_fundamental<float>::value << '\n';
    std::cout << std::is_fundamental<float&>::value << '\n';
    std::cout << std::is_fundamental<float*>::value << '\n';
}

Output:

false
true
false
false
true
false
false

[edit] See also

checks if a type is compound type
(class template) [edit]
checks if a type is arithmetic type
(class template) [edit]
(C++11)
checks if a type is void
(class template) [edit]