函数对戏就是重载了（）运算符的类的对象，它可以像1个函数1样使用。
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#include <iostream>
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#include<functional>
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using namespace std;
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class MyAdd{
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public:
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int operator()(int a,int b){
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return a+b;
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}
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};
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class MyMinus{
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public:
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int operator()(int a,int b){
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return a-b;
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}
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};
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int main(int argc, _TCHAR* argv[]){
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int a=1;
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int b=2;
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MyAdd addobj;
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MyMinus minusobj;
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cout<<"a+b="<<addobj(a,b)<<endl;
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cout<<"a-b="<<minusobj(a,b)<<endl;
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minus<int> int_minus;
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cout<<int_minus(7,9)<<endl;
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getchar();
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return 0;
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}