fill_n


Category: algorithms 
Component type: function 
Prototype
template <class OutputIterator, class Size, class T>
OutputIterator fill_n(OutputIterator first, Size n, const T& value);
Description
Fill_n assigns the value value to every element in the range
[first, first+n). That is, for every iterator i in [first, first+n),
it performs the assignment *i = value. The return value is first +
n.
Definition
Defined in the standard header algorithm, and in the nonstandard
backwardcompatibility header algo.h.
Requirements on types

OutputIterator is a model of Output Iterator.

Size is an integral type (either signed or unsigned).

T is a model of Assignable.

T is convertible to a type in OutputIterator's set of value types.
Preconditions

n >= 0.

There is enough space to hold n values. That is,
[first, first+n) is a valid range.
Complexity
Linear. Fill_n performs exactly n assignments.
Example
vector<double> V;
fill_n(back_inserter(V), 4, 137);
assert(V.size() == 4 && V[0] == 42 && V[1] == 42 && V[2] == 42 && V[3] == 42);
Notes
See also
copy, fill, generate, generate_n, iota
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