template < class OutputIterator, class Size, class T >
void fill_n ( OutputIterator first, Size n, const T& value ); |
<algorithm> |
Fill sequence with value
Sets value to the first n elements in the sequence pointed by first.
The behavior of this function template is equivalent to:
template < class OutputIterator, class Size, class T >
void fill_n ( OutputIterator first, Size n, const T& value )
{
for (; n>0; --n) *first++ = value;
}
|
Parameters
- first
- Output iterators to the initial positions in a sequence of at least n elements.
- n
- Number of elements to set value to.
Its type is an integral type or some other type convertible to it.
- value
- Value to be used to fill the range.
Return value
none
Example
// fill_n example
#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;
int main () {
vector<int> myvector (8,10); // myvector: 10 10 10 10 10 10 10 10
fill_n (myvector.begin(),4,20); // myvector: 20 20 20 20 10 10 10 10
fill_n (myvector.begin()+3,3,33); // myvector: 20 20 20 33 33 33 10 10
cout << "myvector contains:";
for (vector<int>::iterator it=myvector.begin(); it!=myvector.end(); ++it)
cout << " " << *it;
cout << endl;
return 0;
}
|
Output:
myvector contains: 20 20 20 33 33 33 10 10
|
Complexity
Linear: Performs
n assignment operations.
See also
| fill | Fill range with value (function template) |
| generate_n | Generate values for sequence with function (function template) |
| replace | Replace value in range (function template) |
| for_each | Apply function to range (template function) |
