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      std::is_reference

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      < cpp‎ | types

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      is_reference
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      Definido no cabeçalho <type_traits>
      template<class T >
      struct is_reference;
      		(desde C++11)
      Se T é um tipo de referência (lvalue referência ou rvalue referência), fornece o membro constante valuetrue igual. Para qualquer outro tipo, é valuefalse.
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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

      Herdado de 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
      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_typebool
      typestd::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';}

      Saída: 

      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]
      Obtida de "https://pt.cppreference.com/mwiki/index.php?title=cpp/types/is_reference&oldid=24576"
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