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std::is_standard_layout

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Defined in header <type_traits>
template< class T >
struct is_standard_layout;
(a partir do C++ 11)
Se T é um tipo de layout padrão (isto é, um tipo escalar, uma classe padrão de layout, ou uma matriz de tal tipo / classe, possivelmente cv qualificado), fornece o membro constante value true igual. Para qualquer outro tipo, é 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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A classe padrão de layout é uma classe que
Original:
A standard-layout class is a class that
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1. não possui membros não-estáticos de dados que não são de layout padrão
Original:
1. has no non-static data members that aren't standard-layout
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2. não tem funções virtuais e não classes base virtuais
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2. has no virtual functions and no virtual base classes
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3. tem o controle de acesso igual para todos os membros não-estáticos de dados
Original:
3. has the same access control for all non-static data members
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4. não tem classes base que não são layout padrão
Original:
4. has no base classes that aren't standard-layout
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5. ou não tem classe base com membros não-estáticos de dados ou não possui membros não-estáticos de dados na classe derivada mais e apenas uma base com eles
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. não tem classes de base do mesmo tipo que o primeiro membro de dados não estático
Original:
6. has no base classes of the same type as the first non-static data member
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Índice

Inherited from std::integral_constant

Member constants

value
[estática]
true se T is a standard-layout type , false contrário
Original:
true if T is a standard-layout type , false otherwise
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(membro estático público constante)

Member functions

operator bool
converte o objeto em bool, retorna value
Original:
converts the object to bool, returns value
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(função pública membro)

Member types

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

[editar] Notas

Um ponteiro para uma classe padrão de layout podem ser convertidas (com reinterpret_cast) para um ponteiro para o seu primeiro membro de dados não-estático e vice-versa.
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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Se uma união padrão de layout tem dois ou mais padrão de layout de estruturas, é permitido para inspecionar a parte inicial comum deles.
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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O offsetof macro pode ser usada apenas com o padrão de layout de aulas.
Original:
The macro offsetof can only be used with standard-layout classes.
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[editar] Exemplo

#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] Veja também

checks if a type is trivially copyable
(modelo de classe) [edit]
(C++11)
verifica se é um tipo simples de idade dados (POD) tipo
Original:
checks if a type is plain-old data (POD) type
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(modelo de classe) [edit]
byte offset do início de um tipo padrão de disposição-membro especificado
Original:
byte offset from the beginning of a standard-layout type to specified member
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(função macro) [edit]