//演示inner_product的各种正确打开方式
#include <iostream>
#include <list>
#include <numeric>
#include <algorithm>
using namespace std;

//for_each中打印容器中的元素
void print(int ele){
    cout<<ele<<",";
}

int op1(int initV,int ele3){
    return initV+ele3;
}

int op2(int ele1,int ele2){
    return ele1*2+ele2*2;
}

int main()
{
    int dim[]={1,2,3,4,5,6,7,8,9,10};
    int dim2[]={3,4,5,6,7,8,9,10,11,12};
    list<int> l1,l2;
    //copy函数中利用back_inserter初始化list容器l1
    copy(dim,dim+10,back_inserter(l1));
    for_each(l1.begin(),l1.end(),print);  //显示l1
    cout<<endl;
    copy(dim2,dim2+10,back_inserter(l2));
    for_each(l2.begin(),l2.end(),print);  //显示l2
    cout<<endl;
    //求l1和l2的内积并加初值0
    int prod=inner_product(l1.begin(),l1.end(),l2.begin(),0);
    cout<<"inner_product(l1.begin(),l1.end(),l2.begin(),0): "<<prod<<endl;
    //执行op1(initV,op2(l1,l2));
    prod=inner_product(l1.begin(),l1.end(),l2.begin(),1,op1,op2);
    cout<<"inner_product(l1.begin(),l1.end(),l2.begin(),1,op1,op2): "<<prod<<endl;
    //求l1与l2的内积并加上初值1
    prod=inner_product(l1.begin(),l1.end(),l2.begin(),1,plus<int>(),multiplies<int>());
    cout<<"inner_product(l1.begin(),l1.end(),l2.begin(),1,plus<int>(),multiplies: "<<prod<<endl;
    return 0;
}