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      std::valarray::apply

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      <metanoindex/>

       
      C++
       
      Biblioteca numéricos
      Funções matemáticas comuns
      De ponto flutuante ambiente
      Números complexos
      Matrizes numéricas
      Pseudo-aleatório de geração de números
      Tempo de compilação aritmética racional (C++11)
      Genéricos operações numéricas
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      Generic numeric operations
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      (C++11)
       
      std::valarray
      Funções de membro
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      Member functions
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      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>
      valarray<T> apply( T func(T) ) const;
      valarray<T> apply( T func(const T&) ) const;
      Devolve uma valarray novo do mesmo tamanho com valores que são obtidos através da aplicação de func função para os valores anteriores dos elementos.
      Original:
      Returns a new valarray of the same size with values which are acquired by applying function func to the previous values of the elements.
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      Parâmetros

      func -
      funcionar para aplicar os valores
      Original:
      function to apply to the values
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      Valor de retorno

      O valarray resultante com valores adquiridos através da aplicação func função.
      Original:
      The resulting valarray with values acquired by applying function func.
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      Notas

      A função pode ser implementada com o tipo de retorno diferente de std::valarray. Neste caso, o tipo de substituição tem as seguintes propriedades:
      Original:
      The function can be implemented with the return type different from std::valarray. In this case, the replacement type has the following properties:
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      • Todas as funções const membros std::valarray são fornecidos.
        Original:
        All const member functions of std::valarray are provided.
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      • std::valarray, std::slice_array, std::gslice_array, std::mask_array std::indirect_array e pode ser construído a partir do tipo de reposição.
        Original:
        std::valarray, std::slice_array, std::gslice_array, std::mask_array and std::indirect_array can be constructed from the replacement type.
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      • Todas as funções de aceitar um argumentos de const std::valarray& tipo devem também aceitar o tipo de substituição.
        Original:
        All functions accepting a arguments of type const std::valarray& should also accept the replacement type.
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      • Todas as funções que aceitam dois argumentos do tipo const std::valarray& deve aceitar todas as combinações de const std::valarray& e do tipo de substituição.
        Original:
        All functions accepting two arguments of type const std::valarray& should accept every combination of const std::valarray& and the replacement type.
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      Exemplo

      calcula e imprime os 10 primeiros fatoriais
      Original:
      calculates and prints the first 10 factorials
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      #include <iostream>
#include <valarray>
#include <cmath>

int main()
{
    std::valarray<int> v = {1,2,3,4,5,6,7,8,9,10};
    v = v.apply([](int n)->int {
                    return std::round(std::tgamma(n+1));
                });
    for(auto n : v) {
        std::cout << n << ' ';
    }
    std::cout << '\n';
}

      Saída: 

      1 2 6 24 120 720 5040 40320 362880 3628800

      Veja também
      aplica-se uma função de uma série de elementos
      Original:
      applies a function to a range of elements
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      (modelo de função) [edit]