#import importing twice?
#import importing twice?
- Subject: #import importing twice?
- From: Martin Häcker <email@hidden>
- Date: Thu, 19 Jun 2008 10:36:41 +0200
Hi guys,
I was today stung by a problem that I couldn't quite understand.
I was importing a header file with #import and the compiler complained
about a duplicate interface declaration of the class defined in the
header file.
Which was bullshit, because the class was only defined in that header
file - and #import was supposed to shield me from importing that file
more than once.
Doh.
My Problem is, that I couldn't finde a comprehensive documentation on
how #import is supposed to work, besides of the "it only imports a
header once" from [1].
So why did this happen? Where can I find documentation on this?
The only thing that I found is that this was all happening in a
Framework and that the header file was included with #include
"filename.h" once and with #include <frameworkname/filename.h>
somewhere else.
But even then - it's still the same file (and how am I supposed to
reference the file from internal and public headers in the framework
anyway?)
Well, thanks a bunch,
Martin
p.s.: I was able to solve this in two ways, first by switching to
#import <framworkname/filename.h> everywhere and then by removing the
import statements from the headers alltogether and replacing them by
@class declarations.
[1] http://developer.apple.com/documentation/Cocoa/Conceptual/ObjectiveC/Articles/chapter_950_section_4.html#/
/apple_ref/doc/uid/TP30001163-CH3-TPXREF103
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