std::fill

Defined in header <algorithm>
template< class ForwardIt, class T >
void fill( ForwardIt first, ForwardIt last, const T& value );

Assigns the given value to the elements in the range [first, last).

Parameters

first, last - the range of elements to modify
value - the value to be assigned
Type requirements
- ForwardIt must meet the requirements of ForwardIterator.

Return value

(none).

Complexity

Exactly last - first assignments.

Possible implementation

template< class ForwardIt, class T >
void fill(ForwardIt first, ForwardIt last, const T& value)
{
    for (; first != last; ++first) {
        *first = value;
    }
}

Example

The following code uses fill() to set all of the elements of a vector of integers to -1:

#include <algorithm>
#include <vector>
#include <iostream>
 
int main()
{
    std::vector<int> v{0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
 
    std::fill(v.begin(), v.end(), -1);
 
    for (auto elem : v) {
        std::cout << elem << " ";
    }
    std::cout << "\n";
}

Output:

-1 -1 -1 -1 -1 -1 -1 -1 -1 -1

See also

assigns a value to a number of elements
(function template)
(C++11)
copies a range of elements to a new location
(function template)
saves the result of a function in a range
(function template)
applies a function to a range of elements
(function template)
std::experimental::parallel::fill
(parallelism TS)
parallelized version of std::fill
(function template)
doc_CPP
2016-10-11 10:02:46
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