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      std::result_of

      Da cppreference.com
      < cpp‎ | types

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      result_of
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      Definido no cabeçalho <type_traits>
      template<class>
      class result_of;//not defined
      		 (1) (desde C++11)
      template<class F, class... ArgTypes>
      class result_of<F(ArgTypes...)>;
      		 (2) (desde C++11)
      Deduz o tipo de retorno de uma expressão chamada de função em tempo de compilação.
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      Deduces the return type of a function call expression at compile time.
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      Índice

      [editar]Tipos de membro

      Tipo de membro
      Original:
      Member type
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      		 Definition
      type
      o tipo de retorno da função se F chamado com o ArgTypes... argumentos
      Original:
      the return type of the function F if called with the arguments ArgTypes...
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      [editar]Possível implementação

      template<class>struct result_of;   template<class F, class... ArgTypes>struct result_of<F(ArgTypes...)>{typedef decltype(std::declval<F>()(std::declval<ArgTypes>()...)) type;};

      [editar]Exemplo

      struct S {double operator()(char, int&);};   int main(){ std::result_of<S(char, int&)>::type f =3.14;// f has type double}


      [editar]Veja também

      (C++11)
      obtém o tipo de expressão em contexto não avaliada
      Original:
      obtains the type of expression in unevaluated context
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      (modelo de função)[edit]
      Obtida de "https://pt.cppreference.com/mwiki/index.php?title=cpp/types/result_of&oldid=24635"
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