std::fill_n - cppreference.com

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Definido no cabeçalho `<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 );`		(até C++11) (desde C++11)

Atribui o value valor dado aos elementos count primeira no início gama de first se count>0. Não faz nada de outra forma.

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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Parâmetros

first	-	o início do intervalo de elementos para modificar 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	-	número de elementos a modificar 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	-	o valor a ser atribuído 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`.

Valor de retorno

(Nenhum) (até C++11)

Original:

(none) (até C++11)

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Iterator um passado o último elemento atribuído se count>0, first contrário. (desde C++11)

Original:

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

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Complexidade

Exactamente atribuições count, por count>0.

Original:

Exactly count assignments, for count>0.

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Possível implementação

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;
}

Exemplo

O código a seguir usa fill_n() atribuir -1 a primeira metade de um vetor de números inteiros:

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";
}

Saída:

Veja também


	atribui um intervalo de elementos de um certo valor 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. (modelo de função) [edit]