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Invoke method pointers elegantly in C++

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15 Jul 2012CPOL 21.2K   2   19
invoke method pointer elegantly

Introduction

This tip shows an elegent way to invoke method pointers in C++.

Code

C++
//
template <class T> 
class MemFnPtr 
{  
public: 
   MemFnPtr(int (T::*fp)(int), T &t) : m_fp(fp), m_t(t)
   { 
   } 
   int Fn(int n) 
   { 
      return ((m_t).*(m_fp))(n); 
   }
   //member vars 
   int (T::*m_fp)(int); 
   T &m_t; 
 };    
C++
 int main()
   { 
   A a_obj; 
   MemFnPtr<A> fp_a(&A::Func1, a_obj); 
   cout << fp_a.Fn(10) << endl; 
   return 0; 
   } 

History

Tip submitted : 16th July, 2012

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


Written By
Technical Lead Kotha Technologies
Bangladesh Bangladesh
If you are not in - you are out !
- Chapter 1

Comments and Discussions

 
QuestionCan't escape dirty code when its about member pointers! Pin
pasztorpisti26-Jul-12 10:13
pasztorpisti26-Jul-12 10:13 
AnswerRe: Can't escape dirty code when its about member pointers! Pin
Mukit, Ataul27-Jul-12 7:10
Mukit, Ataul27-Jul-12 7:10 
GeneralRe: Can't escape dirty code when its about member pointers! Pin
pasztorpisti27-Jul-12 11:38
pasztorpisti27-Jul-12 11:38 
GeneralRe: Can't escape dirty code when its about member pointers! Pin
Mukit, Ataul27-Jul-12 18:58
Mukit, Ataul27-Jul-12 18:58 
GeneralRe: Can't escape dirty code when its about member pointers! Pin
pasztorpisti27-Jul-12 23:38
pasztorpisti27-Jul-12 23:38 
GeneralRe: Can't escape dirty code when its about member pointers! Pin
Mukit, Ataul28-Jul-12 5:56
Mukit, Ataul28-Jul-12 5:56 
GeneralRe: Can't escape dirty code when its about member pointers! Pin
pasztorpisti28-Jul-12 13:57
pasztorpisti28-Jul-12 13:57 
GeneralRe: Can't escape dirty code when its about member pointers! Pin
Mukit, Ataul28-Jul-12 18:40
Mukit, Ataul28-Jul-12 18:40 
GeneralRe: Can't escape dirty code when its about member pointers! Pin
pasztorpisti29-Jul-12 1:34
pasztorpisti29-Jul-12 1:34 
GeneralRe: Can't escape dirty code when its about member pointers! Pin
Mukit, Ataul29-Jul-12 2:11
Mukit, Ataul29-Jul-12 2:11 
GeneralRe: Can't escape dirty code when its about member pointers! Pin
pasztorpisti29-Jul-12 2:30
pasztorpisti29-Jul-12 2:30 
GeneralMy vote of 1 Pin
Christian Brüggemann16-Jul-12 23:55
Christian Brüggemann16-Jul-12 23:55 
GeneralRe: My vote of 1 Pin
Mukit, Ataul20-Jul-12 21:18
Mukit, Ataul20-Jul-12 21:18 
QuestionHow... Pin
Ollie C15-Jul-12 23:13
Ollie C15-Jul-12 23:13 
AnswerRe: How... Pin
Mukit, Ataul20-Jul-12 21:27
Mukit, Ataul20-Jul-12 21:27 
GeneralMy vote of 1 Pin
Mike Diack15-Jul-12 22:42
Mike Diack15-Jul-12 22:42 
Where's the commentary/article?
GeneralRe: My vote of 1 Pin
Zaraken16-Jul-12 2:50
Zaraken16-Jul-12 2:50 
GeneralRe: My vote of 1 Pin
Mukit, Ataul20-Jul-12 21:22
Mukit, Ataul20-Jul-12 21:22 
QuestionIt's no good just posting source code with no commentary! Pin
Mike Diack15-Jul-12 22:41
Mike Diack15-Jul-12 22:41 

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