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std::is_literal_type

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C++
 
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integral_constant(C++11)
 
Defined in header <type_traits>
template< class T >
struct is_literal_type;
 (a partir do C++ 11)
Se T é um tipo literal, fornece o membro constante value true igual. Para qualquer outro tipo, é value false.
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If T is a literal type, provides the member constant value equal true. For any other type, value is false.
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Um tipo literal é qualquer tipo escalar, qualquer tipo de referência ou um tipo de classe que:
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A literal type is any scalar type, any reference type or a class type that:
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1. tem um destrutor trivial
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1. has a trivial destructor
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2. todas as suas chamadas do construtor e inicializadores para os membros nonstatic dados são expressões constantes
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2. all of its constructor calls and initializers for nonstatic data members are constant expressions
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3. é um tipo de agregado, ou tem pelo menos um construtor constexpr que não é uma cópia ou construtor movimento
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3. is an aggregate type or has at least one constexpr constructor that is not a copy or move constructor
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4. todos os seus membros não estáticas de dados e classes base são tipos literais
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4. all of its nonstatic data members and base classes are literal types
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Uma matriz de tipos literais é também um tipo literal.
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An array of literal types is also a literal type.
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Índice

Inherited from std::integral_constant

Member constants

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

Member functions

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

Member types

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

[editar] Notas

Apenas os tipos de literais podem ser usados ​​como parâmetros para ou retornados de funções constexpr. Apenas classes literais podem ter funções constexpr membros.
Original:
Only literal types may be used as parameters to or returned from constexpr functions. Only literal classes may have constexpr member functions.
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[editar] Exemplo

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

Output: 

true
false
Obtida de "http://pt.cppreference.com/mwiki/index.php?title=cpp/types/is_literal_type&oldid=17174"