std::get(std::tuple) - cppreference.com
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      std::get(std::tuple)

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      <metanoindex/>

       
      C++
       
      Biblioteca de utilitários
      Digite apoio (basic types, RTTI, type traits)
      Gerenciamento de memória dinâmica
      De tratamento de erros
      Utilidades do programa
      Variadic funções
      Data e hora
      Objetos de função
      (C++11)
      (C++11)
      Os operadores relacionais
      Original:
      Relational operators
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      rel_ops::operator!=
      rel_ops::operator>
      rel_ops::operator<=
      rel_ops::operator>=
      Pares e tuplas
      Original:
      Pairs and tuples
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      (C++11)
      (C++11)
      (C++11)
      Troque, avançar e avançar
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      Swap, forward and move
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      (C++11)
      (C++11)
      (C++11)
      (C++11)
       
      std::tuple
      Funções de membro
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      Member functions
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      tuple::tuple
      tuple::operator=
      tuple::swap
      Não-membros funções
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      Non-member functions
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      Classes auxiliares
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      Helper classes
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      <tbody> </tbody>
      template< std::size_t I, class... Types > typename std::tuple_element<I, tuple<Types...> >::type& get( tuple<Types...>& t );
      		 (1) (desde C++11)
      template< std::size_t I, class... Types > typename std::tuple_element<I, tuple<Types...> >::type&& get( tuple<Types...>&& t );
      		 (2) (desde C++11)
      template< std::size_t I, class... Types > typename std::tuple_element<I, tuple<Types...> >::type const& get( const tuple<Types...>& t );
      		 (3) (desde C++11)
      Extrai o elemento elemento Ith da tupla. I é um valor inteiro em [0, sizeof...(Types)).
      Original:
      Extracts the Ith element element from the tuple. I is an integer value in [0, sizeof...(Types)).
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      Parâmetros

      t -
      tupla cujo conteúdo para extrair
      Original:
      tuple whose contents to extract
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      Valor de retorno

      1)

      Referência para o elemento de Ith t.
      Original:
      Reference to the Ith element of t.
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      2)

      Rvalue referência para o elemento de Ith t, a menos que o elemento é de lvalue tipo de referência, neste caso, é devolvido lvalue referência.
      Original:
      Rvalue reference to the Ith element of t, unless the element is of lvalue reference type, in which case lvalue reference is returned.
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      3)

      Const referência ao elemento Ith de t.
      Original:
      Const reference to the Ith element of t.
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      Exceções

      noexcept specification:  
      <tbody> </tbody>
      noexcept
        (desde C++11)

      Exemplo

      #include <iostream>
#include <string>
#include <tuple>

int main()
{
    auto t = std::make_tuple(1, "Foo", 3.14);
    std::cout << "(" << std::get<0>(t) << ", " << std::get<1>(t)
              << ", " << std::get<2>(t) << ")\n";
}

      Saída: 

      (1, Foo, 3.14)

      Veja também