std::valarray::apply

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std::valarray

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valarray::valarray valarray::~valarray valarray::operator= valarray::operator[] valarray::swap valarray::size valarray::resize valarray::sum valarray::min valarray::max valarray::shift valarray::cshift valarray::apply	valarray::operator+ valarray::operator- valarray::operator~ valarray::operator! valarray::operator+= valarray::operator-= valarray::operator*= valarray::operator/= valarray::operator%= valarray::operator&= valarray::operator|= valarray::operator^= valarray::operator<<= valarray::operator>>=
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swap (C++11) begin (C++11) end (C++11) abs exp log log10 pow sqrt sin cos tan asin acos atan atan2 sinh cosh tanh	operator* operator/ operator% operator+ operator- operator^ None operator& operator| operator<< operator>> operator&& operator None operator== operator!= operator< operator> operator<= operator>=
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slice_array gslice_array indirect_array	slice gslice mask_array

 

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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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

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

for_each	Wendet eine Funktion auf eine Reihe von Elementen an (Funktions-Template)