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std::is_reference

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Defined in header <type_traits>
template< class T >
struct is_reference;
 (a partir do C++ 11)
Se T é um tipo de referência (lvalue referência ou rvalue referência), fornece o membro constante value true igual. Para qualquer outro tipo, é value false.
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If T is a reference type (lvalue reference or rvalue reference), provides the member constant value equal true. For any other type, value is false.
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Índice

Inherited from std::integral_constant

Member constants

value
[estática]
true se T is a reference type , false contrário
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true if T is a reference 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] Possível implementação

template <class T> struct is_reference      : std::false_type {};
template <class T> struct is_reference<T&>  : std::true_type {};
template <class T> struct is_reference<T&&> : std::true_type {};

[editar] Exemplo

#include <iostream>
#include <type_traits>
 
class A {};
 
int main() 
{
    std::cout << std::boolalpha;
    std::cout << std::is_reference<A>::value << '\n';
    std::cout << std::is_reference<A&>::value << '\n';
    std::cout << std::is_reference<A&&>::value << '\n';
    std::cout << std::is_reference<int>::value << '\n';
    std::cout << std::is_reference<int&>::value << '\n';
    std::cout << std::is_reference<int&&>::value << '\n';
}

Output: 

false
true
true
false
true
true

[editar] Veja também

(C++11)
verifica se é um tipo de' lvalue referência
Original:
checks if a type is lvalue reference
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(modelo de classe) [edit]
(C++11)
verifica se um tipo é' referência rvalue
Original:
checks if a type is rvalue reference
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(modelo de classe) [edit]
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