I had built a set of linked-list functions and decided to put them
into a class. I am having some difficulty with using function
pointers -- specifically doing a sort.
Prior to moving to the class structure, I had:
// Calling procedure
byPath = (struct ENTRY *)listsort(origList, compare_Path);
// listsort
ENTRY *listsort(ENTRY *list, int(*compare)(void *, void *))
{
...
result = (*compare)(p,q));
...
}
// compare_Path
int compare_Path(void *p, void *q){}
THIS ALL WORKS CORRECTLY
---------------------------------
Now that I've moved the functions into a class, I can't get the sort
to work. I call it like this:
// Calling procedure
obj.sort(compare_Paths);
// listsort
void Entry::sort(int(*compare)(void *, void *)){}
// compare_Paths
int Entry::compare_Paths(void *p, void *q){}
I get an error at the calling procedure line: 'compare_Paths' was not
declared in this scope. I have included the Entry.h file and have the
declaration for compare_Paths in the Public: part of my class.
If I call it with
obj.sort(Entry::compare_Paths);
I get 2 errors:
No matching function for call to 'Entry::sort(<unknown type>)'
Candidates are void Entry::sort(int(*)(void*, void*))
I have also tried creating a sortPaths() function.
// Calling procedure
obj.sortPaths();
// sortPaths
void Entry::sortPaths()
{
sort(Entry::compare_Paths);
}
I get 2 errors:
No matching function for call to 'Entry::sort(<unknown type>)'
Candidates are void Entry::sort(int(*)(void*, void*))
Any assistance in getting this to work will be appreciated.
~Rick
