Declaration

template <class InputIterator, class Size, class OutputIterator>
OutputIterator copy_n(
	InputIterator qInput,
	Size qN,
	OutputIterator qDest
);

Description

This function copies "qN" entries from "qInput" to the location specified by "qDest," writing over the entries.

Header Include

#include <algorithm>

Example

#include <iostream>
#include <vector>
#include <algorithm>

int main()
{
	using namespace std;

	// Create a vector instance
	vector<char> qV;
	qV.push_back('X');
	qV.push_back('o');
	qV.push_back('a');
	qV.push_back('X');
	qV.push_back('.');
	qV.push_back('n');
	qV.push_back('e');
	qV.push_back('t');

	vector<char> qCopy;
	qCopy.push_back('*');
	qCopy.push_back('*');
	qCopy.push_back('*');
	qCopy.push_back('*');
	qCopy.push_back('*');
	qCopy.push_back('*');
	qCopy.push_back('*');
	qCopy.push_back('*');

	vector<char>::iterator qIter;
	// Output the vector
	cout << "Vector: ";
	for (qIter = qV.begin(); qIter != qV.end(); ++qIter) {
		cout << *qIter;
	}
	cout << endl;

	// Output the copy vector before the copy
	cout << "Before the copy:" << endl;
	for (qIter = qCopy.begin(); qIter != qCopy.end(); ++qIter) {
		cout << *qIter;
	}
	cout << endl;

	// Copy elements from the first vector into the second.
	copy_n(qV.begin(), 4, qCopy.begin() + 2);

	// Output the copy vector after the copy
	cout << "After the copy:" << endl;
	for (qIter = qCopy.begin(); qIter != qCopy.end(); ++qIter) {
		cout << *qIter;
	}
	cout << endl;

	// Keep the window open
	cin.get();
	return 0;
}

Output