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Array of function pointers

Posted on 1998-05-18
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Is it possible to create an array of function pointers and if so how ?
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Question by:ShriramS
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msmits earned 20 total points
ID: 1299676
It should not be necessary in C++ and object-oriented programming to use arrats of function pointer, but technically it is possible.

void (*pfa[10])(char*);

Which is an array of 10 pointers to functions that return void and take a char* as parameter.

void xyz(char *x)
{
}

pfa[0] = xyz;

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by:ShriramS
ID: 1299677
What I need to do is have a array of pointers in a class without knowing how many items I need in the array. How do I deal with that ? Can I declare a pointer in the declaration and then define it as an array in the constructor for example ?
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Expert Comment

by:msmits
ID: 1299678
That depends on when you know how may pointer you need. If you know it at constructor time, you can create a pointer to an array of pointers and allocate the memory at constructor time for just the number of elements you need.

void (**pfa)(char*);

void xyz(char *x)
{}

X:x(int n) {
  pfa = new (void (*[n])(char *));
  pfa[0] = xyz;
}

pfa[0]("hello");

If you want real dynamic array, you need to use the vector class from the Standard Library.

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by:ShriramS
ID: 1299679
Thank You
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