Re: "Recursive" #imports
Re: "Recursive" #imports
- Subject: Re: "Recursive" #imports
- From: Alain Schartz <email@hidden>
- Date: Thu, 14 Jun 2007 21:56:19 +0200
After implementing the proposed changes everything works fine ; all I
had to do was declare my classes in the header files (using @class)
and really #import the header files in the implementation files.
Thanks for the quick replies,
Alain
On Jun 14, 2007, at 9:44 PM, Gregory Weston wrote:
Alain Schartz wrote:
I'm having problems with the #import statement :
I have a ClassA, #import-ing ClassB.h ; and ClassB #import-ing
ClassA.h. If I try to compile this, I get parse errors from the
compiler, indicating that something is wrong in my header files. I
was aware that the #include-statement could generate this kind of
problem, but I thought that #import would save me from exactly this
kind of thing?
What import does is guard against circular and redundant
inclusions. It's a convenience against having
#ifndef _MY_HEADER_
#define _MY_HEADER_
// all the stuff you really want
#endif
Unfortunately ClassA needs access to ClassB's methods and vice-versa,
disqualifying the use of the @class-directive... So I'm kind of stuck
here!
Generally people use the @class declaration to _defer_ the #import,
not obviate it. Use @class where you need the names and import the
headers where you actually need the methods. If that's giving you
errors it probably suggests there's actually something wrong/odd
about your headers and we can't really suggest what that is without
seeing them.
G
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