Usage of class member functions in templates

Usage of class member functions in templates

In practice, many templates are used, and class member functions or variables are used as template parameters. Here we will give a small example. The code is very simple, but it is very common and practical in practice.

 

// I am only a test class. class TestClass {public: void testFunc (int val) {} double testFunc2 (double val) {return 0 ;}public: int m_testVal ;}; // It will also be used. If it is not a template, typedef void (TestClass: * test_func) (int) is quite practical. // if it is not about boost, do not talk about lambda, only the template is mentioned. // the template of the member function.
 
  
Void test_call (_ Tp * obj, _ Ret (_ Tp: * _ func) (_ Param), _ Param _ p) {(obj-> * _ func) (_ p);} // The member variable, which is rarely used. The template is mainly used in Imp.
  
   
Void test_member (_ Tp * obj, _ Param _ Tp: * value, _ Param _ p) {obj-> * value = _ p;} int main (int argc, char * argv []) {TestClass * tt = new TestClass; test_call
   
    
(Tt, & TestClass: testFunc, 6); test_call
    
     
(Tt, & TestClass: testFunc2, 6.9); // test_func f1 = & TestClass: testFunc; (tt-> * f1) is commonly used in non-template scenarios) (7); // use test_member (tt, & TestClass: m_testVal, 5); delete tt; return 1;} for member variables ;}
    
   
  
 

There is no extra explanation, and the code is often quite simple.