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From: olson@bootsie.uucp (Eric K. Olson)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Think C #include Question
Message-ID: <1991Mar1.125815.5896@bootsie.uucp>
Date: 1 Mar 91 12:58:15 GMT
References: <1991Feb28.223430.24645@ux1.cso.uiuc.edu>
Organization: Lexington Software Design, Lexington, MA
Lines: 50

In article <1991Feb28.223430.24645@ux1.cso.uiuc.edu> dmmg1176@uxa.cso.uiuc.edu (David M Marcovitz) writes:
>
>-----------Foo.h-----------
>#define _H_Foo   /* prevents file from being included more than once */
>
>#include Baz.h  /* superclass header */
>#include Bar.h  /* other file's header */
>
>struct Foo : Baz
>{
>    Bar *myBar; /* an object of the Bar class */
>       .
>       .
>};
>
>----------Bar.h------------
>#define _H_Bar
>
>#include Baz.h
>#include Foo.h

Leave this #include out

>
>struct Bar : Baz
>{
>    Foo *myFoo; /* an object of the Foo class */

change this to:
     struct Foo *myFoo;

>       .
>       .
>};
>---------------------------

This works equivalently, but does not require the Foo.h header file.

For another example, see CPanorama, which needs to use CScrollPane,
which already #included CPanorama.

-Eric



-- 
Eric K. Olson, Editor, Prepare()      NOTE:     olson@bootsie.uucp doesn't work
Lexington Software Design             Internet: olson@endor.harvard.edu
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