C++11的bind，bind1st，bind2nd，function

#include<iostream>
#include <iterator>
#include <vector>
#include<functional>
#include <algorithm>
using namespace std;
struct LessSort:public binary_function<int,int,bool>//函数对象
{
bool operator()(first_argument_type arg1,second_argument_type arg2)const 
{
return arg1<arg2;
}
};


struct test
{
bool comp(int x,int y)
{
return x<y;
}
};


int main()
{
vector<int>vec;
for(int i=0;i<10;i++)
{
vec.push_back(5*i);
}


cout<<"(";
copy(vec.begin(),vec.end(),ostream_iterator<int>(cout," "));
cout<<")"<<endl;


  cout<<"The number of element larger in vec smaller than 5 is "<<count_if(vec.begin(),vec.end(),bind2nd(LessSort(),5));
  cout<<endl;


cout<<"The number of element larger in vec smaller than 5 is "<<count_if(vec.begin(),vec.end(),bind2nd(less<int>(),5))<<endl;




cout<<"The number of element larger in vec larger than 5 is "<<count_if(vec.begin(),vec.end(),bind1st(less<int>(),5))<<endl;


test testObj;


function<bool(int,int)> func=bind(&test::comp,testObj,placeholders::_1,placeholders::_2);
bool flag=func(10,5);
cout<<"The compare result between 10 and 5 is: "<<flag<<endl;


function<bool(int)> func1=bind(&test::comp,testObj,placeholders::_1,100);//绑定一个参数
cout<<"The compare result between 5 and 100 is: "<<func1(5)<<endl;



return 0;
}