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      std::remove_extent

      Da cppreference.com
      < cpp‎ | types

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      Definido no cabeçalho <type_traits>
      template<class T >
      struct remove_extent;
      		(desde C++11)
      Se T é uma matriz de algum tipo X, fornece o membro typedef type igual X, caso contrário, é typeT. Note que se T é uma matriz multidimensional, apenas a dimensão da primeira é removido.
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      If T is an array of some type X, provides the member typedef type equal to X, otherwise type is T. Note that if T is a multidimensional array, only the first dimension is removed.
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      Índice

      [editar]Tipos de membro

      Nome
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      Name
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      		 Definition
      type
      o tipo do elemento de T
      Original:
      the type of the element of T
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      [editar]Possível implementação

      template<class T>struct remove_extent {typedef T type;};   template<class T>struct remove_extent<T[]>{typedef T type;};   template<class T, std::size_t N>struct remove_extent<T[N]>{typedef T type;};

      [editar]Exemplo

      #include <iostream>#include <iterator>#include <algorithm>#include <type_traits>   template<class A>typenamestd::enable_if<std::rank<A>::value==1>::type print_1d(const A& a){ copy(a, a+std::extent<A>::value, std::ostream_iterator<typename std::remove_extent<A>::type>(std::cout, " "));std::cout<<'\n';}   int main(){int a[][3]={{1,2,3},{4,5,6}};// print_1d(a); // compile-time error print_1d(a[1]);}

      Saída: 

      4 5 6

      [editar]Veja também

      (C++11)
      verifica se o tipo é um tipo de matriz
      Original:
      checks if a type is an array type
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      (modelo de classe)[edit]
      (C++11)
      obtém o número de dimensões de um tipo de matriz
      Original:
      obtains the number of dimensions of an array type
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      (modelo de classe)[edit]
      (C++11)
      obtém o tamanho de um tipo de matriz ao longo de uma dimensão especificada
      Original:
      obtains the size of an array type along a specified dimension
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      (modelo de classe)[edit]
      (C++11)
      		 removes all extents from the given array type
      (modelo de classe)[edit]
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