std::fill_n – cppreference.com

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definiert in Header `<algorithm>`

`template< class OutputIt, class Size, class T > void fill_n( OutputIt first, Size count, const T& value ); template< class OutputIt, class Size, class T > OutputIt fill_n( OutputIt first, Size count, const T& value );`		(bis C + +11) (seit C++11)

Weist den angegebenen Wert value den ersten count Elemente im Bereich beginnend bei first wenn count>0. Tut nichts anderes .

Original:

Assigns the given value value to the first count elements in the range beginning at first if count>0. Does nothing otherwise.

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Parameter

first	-	der Beginn des Bereichs von Elementen zu modifizieren Original: the beginning of the range of elements to modify The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
count	-	Anzahl von Elementen zu modifizieren Original: number of elements to modify The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
value	-	der Wert zugewiesen werden Original: the value to be assigned The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
Type requirements
-`OutputIt` must meet the requirements of `OutputIterator`.

Rückgabewert

(None) (bis C + +11)

Original:

(none) (bis C + +11)

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Iterator ein nach dem letzten Element, wenn count>0, first anderweitig zugeordnet. (seit C++11)

Original:

Iterator one past the last element assigned if count>0, first otherwise. (seit C++11)

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Komplexität

Genau count Zuweisungen für count>0 .

Original:

Exactly count assignments, for count>0.

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Mögliche Implementierung

template<class OutputIt, class Size, class T>
OutputIt fill_n(OutputIt first, Size count, const T& value)
{
    for (Size i = 0; i < count; i++) {
        *first++ = value;
    }
    return first;
}

Beispiel

Der folgende Code verwendet fill_n() bis -1 zuweisen der ersten Hälfte eines Vektors von Ganzzahlen:

Original:

The following code uses fill_n() to assign -1 to the first half of a vector of integers:

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#include <algorithm>
#include <vector>
#include <iostream>
 
int main()
{
    std::vector<int> v1{0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
 
    std::fill_n(v1.begin(), 5, -1);
 
    for (vector<int>::iterator it = v1.begin(); it != v1.end(); ++it) {
        std::cout << *it << " ";
    }
    std::cout << "\n";
}

Output:

Siehe auch


	weist eine Reihe von Elementen ein bestimmter Wert Original: assigns a range of elements a certain value The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Funktions-Template) [edit]