测试functional的bind以及相关功能

注：在VS2010 UPDATE1下测试通过

/*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, 5, 10);
    cout << fcn1() << endl;

    //test bind function
    auto fcn2 = bind(TestCompare, _1, 5);
    cout << fcn2(4) << endl;

    //test binder1st function
    binder1st<greater1<int>> fcn4(greater1<int>(), 6);
    cout << fcn4(7) << endl;

    //test binder1st function
    binder1st<TestBindClass> fcn3(TestBindClass(), 5);
    cout << fcn3(3) << endl;
}