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std::is_standard_layout

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initializer_list(C++11)
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Swap, forward and move
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Tipos básicos
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Basic types
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is_void(C++11)
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is_standard_layout(C++11)
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Supported operations
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integral_constant(C++11)
 
Defined in header <type_traits>
template< class T >
struct is_standard_layout;
(desde C++11)
Si T es un tipo de diseño estándar (es decir, un tipo escalar, una clase de normas de diseño, o una disposición de ese tipo / clase, posiblemente cv-calificados), establece en el miembro constante value true iguales. Para cualquier otro tipo, es value false .
Original:
If T is a standard layout type (that is, a scalar type, a standard-layout class, or an 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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Una clase de normas de diseño es una clase que
Original:
A standard-layout class is a class that
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1. no tiene miembros de datos no estáticos que no son estándar-diseño
Original:
1. has no non-static data members that aren't standard-layout
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2. no tiene funciones virtuales y no hay clases base virtuales
Original:
2. has no virtual functions and no virtual base classes
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3. tiene el control de acceso igual para todos los miembros no estáticos de datos
Original:
3. has the same access control for all non-static data members
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4. no tiene clases base que no son estándar-diseño
Original:
4. has no base classes that aren't standard-layout
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5. o bien no tiene una clase base con los miembros no estáticos de datos o no tiene miembros no estáticos de datos de la clase más derivada y una sola base con ellos
Original:
5. either has no base class with non-static data members or has no non-static data members in the most derived class and only one base with them
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6. no tiene clases base del mismo tipo que el primer no-estática miembro de datos
Original:
6. has no base classes of the same type as the first non-static data member
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Contenido

Inherited from std::integral_constant

Member constants

value
[estático]
true si T is a standard-layout type , false lo contrario
Original:
true if T is a standard-layout 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] Notas

Un puntero a una clase estándar de diseño puede ser convertido (con reinterpret_cast) a un puntero a su primer miembro no estático de datos y viceversa .
Original:
A pointer to a standard-layout class may be converted (with reinterpret_cast) to a pointer to its first non-static data member and vice versa.
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Si un sindicato de normas de diseño cuenta con dos o más estructuras de diseño estándar, está permitido para inspeccionar la parte inicial común de ellos .
Original:
If a standard-layout union holds two or more standard-layout structs, it is permitted to inspect the common initial part of them.
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El offsetof macro sólo se puede utilizar con las clases de diseño estándar .
Original:
The macro offsetof can only be used with standard-layout classes.
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[editar] Ejemplo

#include <iostream>
#include <type_traits>
 
struct A {
    int m;
};
 
struct B {
    int m1;
private:
    int m2;
};
 
struct C {
    virtual void foo();
};
 
int main()
{
    std::cout << std::boolalpha;
    std::cout << std::is_standard_layout<A>::value << '\n';
    std::cout << std::is_standard_layout<B>::value << '\n';
    std::cout << std::is_standard_layout<C>::value << '\n';
}

Output:

true
false
false

[editar] Ver también

checks if a type is trivially copyable
(clase de plantilla) [edit]
(C++11)
Comprueba si un tipo es llano datos antiguos (POD) de tipo
Original:
checks if a type is plain-old data (POD) type
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(clase de plantilla) [edit]
desplazamiento de bytes desde el comienzo de un tipo estándar de diseño de al miembro especificado
Original:
byte offset from the beginning of a standard-layout type to specified member
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(función macro) [edit]