Newsgroups: comp.lang.c++
Path: utzoo!utgpu!cunews!bnrgate!scrumpy!smithwicks!stu4
From: bnrmtl!stu4@larry.mcrcim.mcgill.edu (Craig Jones)
Subject: Re: Pointers to member functions...
Message-ID: <1991Jan22.202756.1801@scrumpy@.bnr.ca>
Followup-To: Passing pointers to member functions
Keywords: pointer, class, function
Sender: news@scrumpy@.bnr.ca (USENET (Sandy Young))
Reply-To: bnrmtl!stu4@larry.mcrcim.mcgill.edu
Organization: Bell Northern Research Montreal, Canada.
Date: Tue, 22 Jan 91 20:27:56 GMT

This is in reference to an earlier posting I made asking
how to pass pointers of member functions (specifically
to ftw()).

Here is an example of how to do it (based on many replies
to my plea) ....

#include <stream.h>
#include <ftw.h>

// Class Definition

class fooclass
{
  public:
	static int greeting(char*, struct stat*, int);
//	^^^^^^ NECESSARY TO BE ABLE TO PASS THIS FUNCTION
//	       TO ftw()

	void call_ftw ();
	void call_ftw2(int (*function)(char*, struct stat*, int));
};

void fooclass::call_ftw()
{
	int return_int;

	return_int = ftw ("..", &fooclass::greeting, 10);
}

void fooclass::call_ftw2 (int (*function)(char*, struct stat*, int))
//
//  Calls ftw() and passes a pointer to the function to ftw.
//
{
	int return_int;

	return_int = ftw ("..", function, 10);
}

int fooclass::greeting(char* path, struct stat* status, int number)
{
	cout << "Now in greeting " << path << "\n";
	return 0;
}


// NON member function definition

int nonclass_greeting (char* path, struct stat* status, int number)
{
	cout << "Now in non class greeting " << path << "\n";
	return 0;
}

main()
{
	fooclass fooobj;

//  Call member function that calls ftw with a pointer to a 
//  member function
	fooobj.call_ftw();

	cout << "\n Now going to do next...\n\n";
	

//  Pass outside function as a pointer to be used inside
    a class member function
	fooobj.call_ftw2(nonclass_greeting);
}


Many thanks for all the help that was given.

-----------------------------------------------------------
  Craig Jones		bnrmtl!stu4@larry.mcrcim.mcgill.edu

  Bell Northern Research, Montreal.
-----------------------------------------------------------