From mboxrd@z Thu Jan  1 00:00:00 1970
From: Matthew Wilcox <willy@linux.intel.com>
Subject: Re: [Linux-nvdimm] [PATCH 1/9] SQUASHME: pmem: Remove unused
 #include headers
Date: Thu, 11 Sep 2014 15:34:52 -0400
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Cc: Matthew Wilcox <willy@linux.intel.com>,
	Ross Zwisler <ross.zwisler@linux.intel.com>,
	Jens Axboe <axboe@fb.com>,
	linux-fsdevel <linux-fsdevel@vger.kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Matthew Wilcox <matthew.r.wilcox@intel.com>,
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To: Boaz Harrosh <boaz@plexistor.com>
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On Thu, Sep 11, 2014 at 02:35:09PM +0300, Boaz Harrosh wrote:
> If header B has an API like
> typeA1 b_foo(typeA2 a2, typeA3 a3);
> where typeA1, typeA2, typeA3 are from an included header A
> and code in C.c needs the use of b_foo(), or even say b_foo is a vector
> that C.c needs to implement. Then typeA1, typeA2, typeA3 are explicit
> by B not implicit.
> 
> Implicit is if B has private structures with say typeXy from header X
> but my code does not need to declare or implement any X types. in order
> to use public API of B.

If I change B to no longer include A, and declare, but not define types
A1-A3, a file which relies on the inclusion of B to define types A1-A3
is now broken.