On Thu, 29 Dec 2011, m...@freebsd.org wrote:
On Thu, Dec 29, 2011 at 6:54 PM, Sean C. Farley <s...@freebsd.org> wrote:
On Sun, 25 Dec 2011, Ed Schouten wrote:
Author: ed
Date: Sun Dec 25 20:15:41 2011
New Revision: 228878
URL: http://svn.freebsd.org/changeset/base/228878
Log:
Remove unneeded guard.
There is no reason why <stdbool.h> needs an include guard. It is already
protected by __bool_true_false_are_defined.
Modified:
head/include/stdbool.h
Modified: head/include/stdbool.h
==============================================================================
--- head/include/stdbool.h Sun Dec 25 18:15:31 2011 (r228877)
+++ head/include/stdbool.h Sun Dec 25 20:15:41 2011 (r228878)
@@ -26,9 +26,6 @@
* $FreeBSD$
*/
-#ifndef _STDBOOL_H_
-#define _STDBOOL_H_
-
#ifndef __bool_true_false_are_defined
#define __bool_true_false_are_defined 1
@@ -44,5 +41,3 @@ typedef int _Bool;
#endif /* !__cplusplus */
#endif /* __bool_true_false_are_defined */
-
-#endif /* !_STDBOOL_H_ */
I just thought of this while reviewing the change: should
__bool_true_false_are_defined be set only if __cplusplus is not set?
It should be set for C99, but I wonder if it should be set for C++.
My quick googling didn't show anything at all about the C++ standard
and stdbool.h or __bool_true_false_are_defined. It was probably
originally set because bool, true, and false are all C++ keywords so
certain code that wanted to ifdef on them didn't also need to check
__cplusplus.
I did not find anything definitive either.
Also, is there a style requirement that the guard for a header file
be based off of the name of the file? I did not see anything obvious
for this within style(9), but I am curious.
I think it's just common use to make sure different headers use a
different include guard, so they only protect their contents, not any
other file's. The C standard only mentions the symbols bool, true,
false, and __bool_true_false_are_defined in regards to stdbool.h.
Thank you. I asked since I have only really noticed filename-based
guards in the tree although not all are this way (i.e., bsdxml.h uses
Expat_INCLUDED).
Sean
--
s...@freebsd.org
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