注：在VS2010 UPDATE1下测试通过
1 /*测试functional的bind以及相关功能*/
2
3 #include <iostream>
4 #include <functional>
5
6 using namespace std;
7 using namespace std::placeholders;
8
9 int TestAdd(int a, int b)
10 {
11 return a+b;
12 }
13 bool TestCompare(int a, int b)
14 {
15 return a<b;
16 }
17 class TestBindClass
18 {
19 public:
20 bool operator() (const int &a, const int &b) const
21 {
22 cout << a << "<" << b << " ? " << ( a<b ? "true" : "false" ) << endl;
23 return a<b;
24 }
25 typedef int first_argument_type;
26 typedef int second_argument_type;
27 typedef bool result_type;
28 };
29 template <class T> struct greater1
30 {
31 bool operator() (const T& x, const T& y) const
32 {
33 cout << x << ">" << y << " ? " << ( x>y ? "true" : "false" ) << endl;
34 return x>y;
35 }
36 //void operator() (const T& a, const T& b) const {cout << "a<b ? " << ( a<b ? "true" : "false" ) << endl;}
37 typedef T first_argument_type;
38 typedef T second_argument_type;
39 typedef bool result_type;
40 };
41
42 void main()
43 {
44 //test bind function
45 auto fcn1 = bind(TestAdd, 5, 10);
46 cout << fcn1() << endl;
47
48 //test bind function
49 auto fcn2 = bind(TestCompare, _1, 5);
50 cout << fcn2(4) << endl;
51
52 //test binder1st function
53 binder1st<greater1<int>> fcn4(greater1<int>(), 6);
54 cout << fcn4(7) << endl;
55
56 //test binder1st function
57 binder1st<TestBindClass> fcn3(TestBindClass(), 5);
58 cout << fcn3(3) << endl;
59 }
时间： 2024-08-10 19:09:11