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std::valarray::apply - cppreference.com

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`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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (modelo de função) [edit]