/*测试functional的bind以及相关功能*/

 #include <iostream>

 #include <functional>

 using namespace std;

 using namespace std::placeholders;

 int TestAdd(int a, int b)

 {

     return a+b;

 }

 bool TestCompare(int a, int b)

 {

     return a<b;

 }

 class TestBindClass

 {

 public:

     bool operator() (const int &a, const int &b) const

     {

         cout << a << "<" << b << " ? " << ( a<b ? "true" : "false" ) << endl;

         return a<b;

     }

     typedef int first_argument_type;

     typedef int second_argument_type;

     typedef bool result_type;

 };

 template <class T> struct greater1

 {

     bool operator() (const T& x, const T& y) const

     {

         cout << x << ">" << y << " ? " << ( x>y ? "true" : "false" ) << endl;

         return x>y;

     }

     //void operator() (const T& a, const T& b) const {cout << "a<b ? " << ( a<b ? "true" : "false" ) << endl;}

     typedef T first_argument_type;

     typedef T second_argument_type;

     typedef bool result_type;

 };

 void main()

 {

     //test bind function

     auto fcn1 = bind(TestAdd, , );

     cout << fcn1() << endl;

     //test bind function

     auto fcn2 = bind(TestCompare, _1, );

     cout << fcn2() << endl;

     //test binder1st function

     binder1st<greater1<int>> fcn4(greater1<int>(), );

     cout << fcn4() << endl;

     //test binder1st function

     binder1st<TestBindClass> fcn3(TestBindClass(), );

     cout << fcn3() << endl;

 }