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std::is_fundamental

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< cpp‎ | types

 
 
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integral_constant(C++11)
 
Defined in header <type_traits>
template< class T >
struct is_fundamental;
(desde C++11)
Si T es un tipo fundamental (es decir, tipo aritmético, void, o nullptr_t), proporciona el miembro constante value true igual. Para cualquier otro tipo, es value false .
Original:
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.
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Contenido

Inherited from std::integral_constant

Member constants

value
[estático]
true si T is a fundamental type , false lo contrario
Original:
true if T is a fundamental type , false otherwise
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(público miembro constante estática)

Member functions

operator bool
convierte el objeto a bool, devuelve value
Original:
converts the object to bool, returns value
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(miembro público función)

Member types

Tipo
Original:
Type
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Definition
value_type bool
type std::integral_constant<bool, value>

[editar] Posible implementación

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
> {};

[editar] Ejemplo

#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

[editar] Ver también

Comprueba si un tipo es de tipo compuesto
Original:
checks if a type is compound type
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(clase de plantilla) [edit]
Comprueba si un tipo es de tipo aritmético
Original:
checks if a type is arithmetic type
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(clase de plantilla) [edit]
(C++11)
Comprueba si un tipo es void
Original:
checks if a type is void
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(clase de plantilla) [edit]