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From: achoi@cory.Berkeley.EDU (Andrew Choi)
Newsgroups: comp.lang.c++
Subject: How To Do User-Defined Conversion?
Keywords: operator
Message-ID: <28717@pasteur.Berkeley.EDU>
Date: 12 Oct 90 02:24:44 GMT
Sender: news@pasteur.Berkeley.EDU
Reply-To: achoi@cory.Berkeley.EDU (Andrew Choi)
Organization: University of California, Berkeley
Lines: 31

Hello world.

This may be a simple question to most of you, but I just cannot
figure it out.

How do you define the operator which converts a class object to
a pointer to a function returning int?  More specifically, I want
to do the following:

	Class A;
	int (*fp)();

	fp = A;		/* Needs user-defined conversion here */
	fp();

I tried the followings:

	operator int (*)()	{ ... }
	operator int (*)()()	{ ... }		// I think it's either this
	operator (int (*)())()	{ ... }		//  or this
	operator int (*())()	{ ... }

However, g++ version 1.37.2 alpha 2 gives me parse errors on all 4 
approaches.  Does anyone know how to do this correctly?  Is it legal
or possible to define an operator which does the above conversion.

Thank you very much for your help.

Name:  Andrew Choi	Internet Address:  achoi@cory.berkeley.edu
Tel:   (415)848-5658
#include <standard/disclaimer.h>