Learning notes-template function, template structure, template class

#include <iostream>
#include <algorithm>
using namespace std;
template <typename S>
struct show
{
void operator()(const S& element) const
    {
        cout<<element<<endl;
    }
};

int main()
{

int a[3]={1,2,3};
    for_each(a,a+4,show<int>());

int n;
    cin>>n;
return 0;
}

For_each (A, A + 4, show <int> (); how does this work? What is the working principle?

Then I wrote the following struct:

#include <iostream>
#include <algorithm>
using namespace std;
struct Add
{
int sum;
    Add()
    {

    }
    Add( int x)
    {
        sum=x;
    }
int operator()(int y)
    {
return sum+y;
    }
};
int main()
{
int a[5]={1,2,3,4,5};
    for_each(a,a+5,Add(1));
    Add add= Add(2);
    cout<<add(1);
int n;
    cin>>n;
return 0;
}

Then I understand that show <int> () is the operator (INT) function that calls the object of the struct.

Author: Lin yufei
Source: http://www.cnblogs.com/zhengyuhong/
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