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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;`

Retourne une nouvelle valarray de la même taille avec des valeurs qui sont acquises par l'application func fonction des valeurs précédentes des éléments .

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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Paramètres

func

-

fonctionner à appliquer aux valeurs

Original:

function to apply to the values

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Retourne la valeur

Le valarray résultant des valeurs acquises par l'application func fonction .

Original:

The resulting valarray with values acquired by applying function func.

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Notes

La fonction peut être mise en œuvre avec le type de retour différent de std::valarray. Dans ce cas, le type de remplacement a les propriétés suivantes:

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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Toutes les fonctions de membre de const std::valarray sont fournis .
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 et std::indirect_array peut être construit à partir du type de remplacement .
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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Toutes les fonctions acceptant un argument de type de const std::valarray& devrait également accepter le type de remplacement .
Original:
All functions accepting a arguments of type const std::valarray& should also accept the replacement type.
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Toutes les fonctions qui acceptent deux arguments de type de const std::valarray& devrait accepter toutes les combinaisons de const std::valarray& et le type de remplacement .
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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Exemple

calcule et imprime les 10 premières factorielles

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';
}

Résultat :

1 2 6 24 120 720 5040 40320 362880 3628800

Voir aussi


	applique une fonction à une série d'éléments 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. (fonction générique) [edit]