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      std::extent

      Da cppreference.com
      < cpp‎ | types

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      extent
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      Definido no cabeçalho <type_traits>
      template<class T, unsigned N =0>
      struct extent;
      		(desde C++11)

      If T is an array type, provides the member constant value equal to the number of elements along the Nth dimension of the array, if N is in [0, std::rank<T>::value). For any other type, or if T is array of unknown bound along its first dimension and N is 0, value is 0.

      Índice

      Herdado de std::integral_constant

      Member constants

      value
      [estática]
      		 the number of elements along the Nth dimension of T
      (membro estático público constante)

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      operator std::size_t
      converte o objeto em std::size_t, retorna value
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      converts the object to std::size_t, returns value
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      (função pública membro)

      Member types

      Tipo
      Original:
      Type
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      		 Definition
      value_typestd::size_t
      typestd::integral_constant<std::size_t, value>

      [editar]Possível implementação

      template<class T, unsigned N =0>struct extent :std::integral_constant<std::size_t, 0>{};   template<class T>struct extent<T[], 0>:std::integral_constant<std::size_t, 0>{};   template<class T, unsigned N>struct extent<T[], N>:std::integral_constant<std::size_t, std::extent<T, N-1>::value>{};   template<class T, std::size_t N>struct extent<T[N], 0>:std::integral_constant<std::size_t, N>{};   template<class T, std::size_t I, unsigned N>struct extent<T[I], N>:std::integral_constant<std::size_t, std::extent<T, N-1>::value>{};

      [editar]Exemplo

      #include <iostream>#include <type_traits>   int main(){std::cout<< std::extent<int[3]>::value<<'\n';std::cout<< std::extent<int[3][4]>::value<<'\n';std::cout<< std::extent<int[3][4],1>::value<<'\n';std::cout<< std::extent<int[3][4],2>::value<<'\n';std::cout<< std::extent<int[]>::value<<'\n';}

      Saída: 

      3 3 4 0 0

      [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)
      remove uma medida do tipo matriz dada
      Original:
      removes one extent from the given array type
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      (modelo de classe)[edit]
      (C++11)
      		 removes all extents from the given array type
      (modelo de classe)[edit]
      Obtida de "https://pt.cppreference.com/mwiki/index.php?title=cpp/types/extent&oldid=24541"
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