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_Bool may be an intrinsic type

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2371 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2009-12-17 18:36:18 +00:00
parent 49d1ebf6ab
commit 7692347cfa
1 changed files with 16 additions and 4 deletions
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20
include/stdbool.h
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@ -51,9 +51,14 @@
/* bool, true, and false must be provided as macros so that they can be
* redefined by the application if necessary.
*
* NOTE: Under C99 'bool' is required to be defined to be the intrinsic type
* _Bool. However, in this NuttX context, we need backward compatibility
* to pre-C99 standards where _Bool is not an intrinsic type. Hence, we
* use _Bool8 as the underlying type.
*/
#define bool _Bool
#define bool _Bool8
#define true 1
#define false 0
@ -64,10 +69,17 @@
****************************************************************************/
/* A byte is the smallest address memory element (at least in architectures
* that do not support bit banding. We select uint8_t versus the more standard
* int as the underlying type to minimize the RAM footprint of the executable.
* that do not support bit banding). The requirement is only that type _Bool
* be large enough to hold the values 0 and 1. We select uint8_t to minimize
* the RAM footprint of the executable.
*
* NOTE: We can't actually define the type _Bool here. Under C99 _Bool is
* an intrinsic type and cannot be the target of a typedef. However, in this
* NuttX context, we also need backward compatibility to pre-C99 standards
* where _Bool is not an intrinsic type. We work around this by using _Bool8
* as the underlying type.
*/
typedef uint8_t _Bool;
typedef uint8_t _Bool8;
#endif /* __INCLUDE_STDBOOL_H */