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Invoke method pointers elegantly in C++

, 15 Jul 2012 CPOL 8.3K 2
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invoke method pointer elegantly

Introduction

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

Code

//
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; 
 };    
 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)

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About the Author

Mukit, Ataul
Chief Technology Officer Rational Technologies
Bangladesh Bangladesh
Your Lord does not like people who waste by extravagance, and only the righteous C s, and does so in increments, and they are of those people who are mindful of what memory and time has in offer and they waste none of it.
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Comments and Discussions

 
QuestionCan't escape dirty code when its about member pointers! Pin
pasztorpisti26-Jul-12 11:13
memberpasztorpisti26-Jul-12 11:13 
AnswerRe: Can't escape dirty code when its about member pointers! Pin
Mukit, Ataul27-Jul-12 8:10
memberMukit, Ataul27-Jul-12 8:10 
GeneralRe: Can't escape dirty code when its about member pointers! Pin
pasztorpisti27-Jul-12 12:38
memberpasztorpisti27-Jul-12 12:38 
GeneralRe: Can't escape dirty code when its about member pointers! [modified] Pin
Mukit, Ataul27-Jul-12 19:58
memberMukit, Ataul27-Jul-12 19:58 
GeneralRe: Can't escape dirty code when its about member pointers! Pin
pasztorpisti28-Jul-12 0:38
memberpasztorpisti28-Jul-12 0:38 
GeneralRe: Can't escape dirty code when its about member pointers! Pin
Mukit, Ataul28-Jul-12 6:56
memberMukit, Ataul28-Jul-12 6:56 
GeneralRe: Can't escape dirty code when its about member pointers! Pin
pasztorpisti28-Jul-12 14:57
memberpasztorpisti28-Jul-12 14:57 
GeneralRe: Can't escape dirty code when its about member pointers! Pin
Mukit, Ataul28-Jul-12 19:40
memberMukit, Ataul28-Jul-12 19:40 
GeneralRe: Can't escape dirty code when its about member pointers! Pin
pasztorpisti29-Jul-12 2:34
memberpasztorpisti29-Jul-12 2:34 
GeneralRe: Can't escape dirty code when its about member pointers! Pin
Mukit, Ataul29-Jul-12 3:11
memberMukit, Ataul29-Jul-12 3:11 
GeneralRe: Can't escape dirty code when its about member pointers! Pin
pasztorpisti29-Jul-12 3:30
memberpasztorpisti29-Jul-12 3:30 
GeneralMy vote of 1 Pin
Christian Brüggemann17-Jul-12 0:55
memberChristian Brüggemann17-Jul-12 0:55 
GeneralRe: My vote of 1 Pin
Mukit, Ataul20-Jul-12 22:18
memberMukit, Ataul20-Jul-12 22:18 
QuestionHow... Pin
Ollie C16-Jul-12 0:13
memberOllie C16-Jul-12 0:13 
AnswerRe: How... Pin
Mukit, Ataul20-Jul-12 22:27
memberMukit, Ataul20-Jul-12 22:27 
GeneralMy vote of 1 Pin
Mike Diack15-Jul-12 23:42
memberMike Diack15-Jul-12 23:42 
GeneralRe: My vote of 1 Pin
Zaraken16-Jul-12 3:50
memberZaraken16-Jul-12 3:50 
GeneralRe: My vote of 1 Pin
Mukit, Ataul20-Jul-12 22:22
memberMukit, Ataul20-Jul-12 22:22 
QuestionIt's no good just posting source code with no commentary! Pin
Mike Diack15-Jul-12 23:41
memberMike Diack15-Jul-12 23:41 

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