From: Adam Simpkins <adam@adamsimpkins.net>
Date: Sun, 06 Apr 2008 22:58:20 GMT
Subject: Re: [PATCH 1/4] Add history graph API
Message-ID: <20080406225819.GE5822@adamsimpkins.net>
In-Reply-To: <alpine.DEB.1.00.0804062315090.12583@eeepc-johanness>

On Sun, Apr 06, 2008 at 11:15:58PM +0100, Johannes Schindelin wrote:
> On Sun, 6 Apr 2008, Adam Simpkins wrote:
> > On Sun, Apr 06, 2008 at 10:06:24PM +0100, Johannes Schindelin wrote:
> > > On Sun, 6 Apr 2008, Adam Simpkins wrote:
> > > 
> > > > +/* Defined in commit.h */
> > > > +struct commit;
> > > > +/* Defined in strbuf.h */
> > > > +struct strbuf;
> > > 
> > > You do not need those.
> > 
> > I added them so that graph.h can be included without including any other 
> > header files first.  They can be taken out if we assume that all users 
> > of graph.h will include commit.h and strbuf.h first.
> 
> AFAICT you do not even need them then.  Using "struct strbuf *" without 
> ever declaring struct strbuf before that is perfectly valid.

Trying to compile the following test code with gcc 4.1.2 results in a
warning.

test.c:
	#include <stdio.h>
	
	void test(struct strbuf *sb);
	int main(int argc, char **argv)
	{
		test(NULL);
		return 0;
	}

$ gcc -c test.c
test.c:3: warning: ‘struct strbuf’ declared inside parameter list
test.c:3: warning: its scope is only this definition or declaration, which is probably not what you want

-- 
Adam Simpkins
adam@adamsimpkins.net