Espaços nominais
Variantes
Acções

std::valarray::apply

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< cpp‎ | numeric‎ | valarray

 
 
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
Original:
Generic numeric operations
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iota(C++11)
accumulate
inner_product
adjacent_difference
partial_sum
 
std::valarray
Funções de membro
Original:
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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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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Índice

[editar] Parâmetros

func -
funcionar para aplicar os valores
Original:
function to apply to the values
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[editar] 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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[editar] 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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[editar] 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';
}

Output:

1 2 6 24 120 720 5040 40320 362880 3628800

[editar] 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]