accumulatepromain.cpp

C++ stl accumulate的使用实例

#include <numeric>		
#include <functional>
#include <list>		
#include <iostream>

using namespace std;

int main()
{
	int na[] = {1,2,3,4};
//	list<int,allocator<int>> nlist(na, na+4);
	list<int> nlist(na, na+4);

	//1+2+3+4 and +0
	int sum_na = accumulate(na, na+4, 0);
	cout << sum_na <<endl;

	//1+2+3+4 and +0
	int sum_list = accumulate(nlist.begin(),nlist.end(),0,plus<int>());
	cout << sum_list << endl;

	//1*2*3*4 and *2
	int mul_list = accumulate(nlist.begin(),nlist.end(),2,multiplies<int>());
	cout << mul_list << endl;

	return 0;
}