using

 1 #include <iostream>
 2 
 3 int add(int a, int b)
 4 {
 5     return a + b;
 6 }
 7 
 8 typedef int(*ADD)(int a, int b);
 9 
10 using FUNC= int(*)(int a, int b);//别名
11 
12 void main()
13 {
14     ADD p = add;
15 
16     std::cout << p(1, 2) << std::endl;//3
17     
18     FUNC func = add;
19 
20     std::cout << func(1, 2) << std::endl;//3
21     
22     system("pause");
23 }

 1 #include <iostream>
 2 
 3 namespace space//模板最好放在命名空间内部，隔离模板，避免冲突
 4 {
 5     template <class T> using ptr = T *;//模板的简写
 6 }
 7 
 8 void main()
 9 {
10     space::ptr<int>pint(new int(15));//定义一个指针并初始化，指针指向类型是int
11 
12     std::cout << *pint << " " << pint << std::endl;//15
13     
14     system("pause");
15 }