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Tip of the Day
Home » Tip Bank » C++
Language: C++
Expertise: Intermediate
Apr 30, 2001

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Calling a Function Through a Pointer


The common way of calling a function through a pointer is using the pointer as if it were a function. In other words, if p is a pointer to a function called f:
 
int f(int n)
{
 return n;
}

int (*p)(int)=f; 

Then there's no syntactic difference between calling f() directly, e.g.,
 
int m=f(n);

and calling f() through the pointer p:
 
int m=p(n);

However, it is allowed to use the (*p)(n) to call a function through a pointer:
 
int m=(*p)(n);

This form was prevalent in pre-standard C and is still permitted today. You shouldn't use it new code. However, it's very common in legacy code so you should be familiar with it.
Danny Kalev
 
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