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From: ajb@wpi.WPI.EDU (Arthur J. Butler)
Newsgroups: comp.lang.c++
Subject: is it possible to cast a pointer to a pointer ?
Keywords: pointer casting
Message-ID: <16046@wpi.WPI.EDU>
Date: 27 Sep 90 02:29:31 GMT
Organization: Worcester Polytechnic Institute, Worcester, MA
Lines: 22

assume i have too classes called Foo and Bar.  i can define a
conversion operator which will cast a type Bar to type Foo or a type
Foo*.  can i define a conversion operator to cast a Bar* to a Foo* ???

my thoughts are that i cannot, since the conversion operator takes no
arguments.  anyone want to show me wrong ??

/* some sample code */

class Foo {
.....
};

class Bar {
   private:
	Foo *foo_ptr;
   public:
	.....
	// granted, here we are giving away access to private data!!
	operator Foo*() { return(foo_ptr); } 
	operator Foo() { return(*foo_ptr); }
};