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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;`

Gibt ein neues valarray gleicher Größe mit den Werten, die durch Anwendung der Funktion func zu den vorherigen Werten der Elemente erfasst werden .

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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Parameter

func

-

Funktion, um die Werte zu übernehmen

Original:

function to apply to the values

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Rückgabewert

Die daraus resultierende valarray mit Werten, indem Funktion func erworben .

Original:

The resulting valarray with values acquired by applying function func.

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Notes

Die Funktion kann mit dem Rückgabetyp anders std::valarray umgesetzt werden. In diesem Fall weist die Ersetzungsart die folgenden Eigenschaften:

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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Alle const Elementfunktionen std::valarray bereitgestellt werden .
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 und std::indirect_array kann aus dem Ersatz-Typ gebaut werden .
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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Alle Funktionen Annehmen eines Argumente des Typs const std::valarray& sollten auch akzeptieren, den Austausch Typ .
Original:
All functions accepting a arguments of type const std::valarray& should also accept the replacement type.
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Alle Funktionen mit zwei Parametern vom Typ const std::valarray& sollten akzeptieren, jede Kombination von const std::valarray& und den Ersatz Typ .
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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Beispiel

berechnet und druckt die ersten 10 Fakultäten

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

Siehe auch


	Wendet eine Funktion auf eine Reihe von Elementen an (Funktions-Template) [edit]