std::fill_n – cppreference.com

std::fill_n

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C++
 
Algorithm Bibliothek
Funktionen
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Functions
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Nicht-modifizierende Sequenz Operationen
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Non-modifying sequence operations
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Modifizierende Sequenz Operationen
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Modifying sequence operations
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Partitionierungsoperationen
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Partitioning operations
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Sortierung Operationen (auf sortierten Bereiche)
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Sorting operations (on sorted ranges)
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Binary Suchaktionen (auf sortierten Bereiche)
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Binary search operations (on sorted ranges)
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Set-Operationen (auf sortierten Bereiche)
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Set operations (on sorted ranges)
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Heap-Operationen
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Heap operations
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Minimum / Maximum Operationen
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Minimum/maximum operations
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Numerische Operationen
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Numeric operations
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C-Bibliothek
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C library
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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
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the beginning of the range of elements to modify
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count -
Anzahl von Elementen zu modifizieren
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number of elements to modify
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value -
der Wert zugewiesen werden
Original:
the value to be assigned
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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: 

-1 -1 -1 -1 -1 5 6 7 8 9

Siehe auch