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std::is_trivial

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is_trivial
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Definido en la cabecera <type_traits>
template< class T >
struct is_trivial;
(desde C++11)
Si T es un tipo trivial (es decir, un tipo escalar, una clase trivialmente copiables con un constructor predeterminado trivial, o una matriz de este tipo / clase, posiblemente cv-cualificada), proporciona el miembro constante value true igual. Para cualquier otro tipo, es value false .
Original:
If T is a trivial type (that is, a scalar type, a trivially copyable class with a trivial default constructor, or array of such type/class, possibly cv-qualified), 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 trivial type , false lo contrario
Original:
true if T is a trivial type , false otherwise
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(miembro público estático constante)

Member functions

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

Member types

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

[editar] Notas

Sólo los objetos (incluyendo arrays) de tipo trivial puede ser creado por una llamada a std::malloc .
Original:
Only objects (including arrays) of trivial type may be created by a call to std::malloc.
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[editar] Posible implementación

template< class T >
struct is_trivial : std::integral_constant< 
    bool,
    std::is_trivially_copyable<T>::value &&
    std::is_trivially_default_constructible<T>::value 
> {};

[editar] Ejemplo

#include <iostream>
#include <type_traits>
 
struct A {
    int m;
};
 
struct B {
    B() {}
};
 
int main() 
{
    std::cout << std::boolalpha;
    std::cout << std::is_trivial<A>::value << '\n';
    std::cout << std::is_trivial<B>::value << '\n';
}

Salida:

true
false

[editar] Ver también

checks if a type is trivially copyable
(plantilla de clase) [editar]