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作用：向容器中填充元素。

定义：

#include <algorithm>

template <class forwardItr, class Type>
void fill(forwardItr first, forwardItr last, const Type& value);

template <class forwardItr, class size, class Type>
void fill_n(forwardItr first, size n, const Type& value);

#include <iostream>
#include <list>

#include <string>
#include <numeric>
#include <iterator>
#include <vector>
#include <functional>

#include <algorithm>
using namespace std;
int main() {
	// 容器大小为8
	vector<int> vecList(8);
	ostream_iterator<int> screen(cout, " ");

	// 从开始到结束全部赋值为2
	fill(vecList.begin(),vecList.end(),2);

	cout << "vecList:" << endl;
	copy(vecList.begin(),vecList.end(),screen);
	cout << endl;

	// 从开始以此赋值，3个5
	fill_n(vecList.begin(),3,5);
	cout << "vecList:" << endl;
	copy(vecList.begin(),vecList.end(),screen);
	cout << endl;

	return 0;
}

vList1:
1 2 3 4 5 6 7 8
vList2:
1 2 3 4 5 6 7 8
listTemp:
8 7 6 5 4 3 2 1