function template

 1 #include<iostream>
 2 using namespace std;
 3 
 4 
 5 //function template
 6 template<class T>
 7 void sort(T* array,int len,bool(*compare)(T& a,T& b))
 8 {
 9 
10     T temp;
11     for(int i=0;i<len;i++)  //bubble sort
12     {
13         for(int j=len-1;j>i;j--)
14         {
15             if(compare(array[j],array[j-1]))
16             {
17                 temp=array[j];
18                 array[j]=array[j-1];
19                 array[j-1]=temp;
20             }
21         }
22     }
23 }
24 
25 template<class T>
26 bool ascend(T& a,T& b)
27 {
28     return a<b?true:false;
29 }
30 
31 template<class T>
32 bool descend(T& a,T& b)
33 {
34     static int count=0;  //caculate the number of the function
35     count++;
36     cout<<count<<"float"<<endl;
37     return a>b?true:false;
38 }
39 
40 int main()
41 {
42     int arrayInt[10]={1,4,2,9,5,7,3,6,0,8};
43     float arrayFloat[10]={1.1,4.0,2.0,9.0,5.0,7.0,3.0,6.0,0.0,8.0};
44     sort<int>(arrayInt,10,ascend<int>);
45     for(int i=0;i<10;i++)
46     {
47         cout<<arrayInt[i]<<"";
48     }
49     cout<<endl;
50     sort<float>(arrayFloat,10,descend<float>);
51     for(int i=0;i<10;i++)
52     {
53         cout<<arrayFloat[i]<<" ";
54     }
55     cout<<endl;
56 
57     return 0;
58 }