* This file is part of DevLib - See devlib/README for information.
* -->
*
- * \version $Id$
+ * \brief Common and handy function macros
*
+ * \version $Id$
* \author Bernardo Innocenti <bernie@develer.com>
* \author Giovanni Bajo <rasky@develer.com>
- *
- * \brief Common and handy function macros
*/
/*#*
*#* $Log$
- *#* Revision 1.4 2004/08/25 14:12:08 rasky
- *#* Aggiornato il comment block dei log RCS
+ *#* Revision 1.10 2005/01/22 04:19:50 bernie
+ *#* Use non-uglified typeof().
+ *#*
+ *#* Revision 1.9 2004/12/08 08:51:34 bernie
+ *#* Add type-generic macros for C++.
+ *#*
+ *#* Revision 1.8 2004/10/19 07:14:20 bernie
+ *#* Add macros to test for specific compiler features.
+ *#*
+ *#* Revision 1.7 2004/09/20 03:30:45 bernie
+ *#* C++ also has variadic macros.
+ *#*
+ *#* Revision 1.6 2004/09/14 21:02:04 bernie
+ *#* SWAP(), MINMAX(): New macros.
+ *#*
+ *#* Revision 1.5 2004/08/29 21:57:58 bernie
+ *#* Move back STATIC_ASSERT() to compiler.h as it's needed in cpu.h;
+ *#* iptr_t, const_iptr_t: Replace IPTR macro with a real typedef.
*#*
*#* Revision 1.3 2004/08/24 14:13:48 bernie
*#* Restore a few macros that were lost in the way.
#include <compiler.h>
-/* Type-generic macros */
-#if GNUC_PREREQ(2,0)
+/* avr-gcc does not seem to support libstdc++ */
+#if defined(__cplusplus) && !CPU_AVR
+ /* Type-generic macros implemented with template functions. */
+ #include <algorithm>
+
+ template<class T> inline T ABS(T n) { return n >= 0 ? n : -n; }
+ #define MIN(a,b) std::min(a, b)
+ #define MAX(a,b) std::max(a, b)
+ #define SWAP(a,b) std::swap(a, b)
+#elif (COMPILER_STATEMENT_EXPRESSIONS && COMPILER_TYPEOF)
+ /* Type-generic macros implemented with statement expressions. */
#define ABS(n) ({ \
- __typeof__(n) _n = (n); \
+ typeof(n) _n = (n); \
(_n < 0) ? -_n : _n; \
})
#define MIN(a,b) ({ \
- __typeof__(a) _a = (a); \
- __typeof__(b) _b = (b); \
+ typeof(a) _a = (a); \
+ typeof(b) _b = (b); \
(void)(&_a == &_b); /* ensure same type */ \
(_a < _b) ? _a : _b; \
})
#define MAX(a,b) ({ \
- __typeof__(a) _a = (a); \
- __typeof__(b) _b = (b); \
+ typeof(a) _a = (a); \
+ typeof(b) _b = (b); \
(void)(&_a == &_b); /* ensure same type */ \
(_a > _b) ? _a : _b; \
})
-#else /* !GNUC */
+#else /* !(COMPILER_STATEMENT_EXPRESSIONS && COMPILER_TYPEOF) */
/* Buggy macros for inferior compilers. */
#define ABS(a) (((a) < 0) ? -(a) : (a))
#define MIN(a,b) (((a) < (b)) ? (a) : (b))
#define MAX(a,b) (((a) > (b)) ? (a) : (b))
-#endif /* !GNUC */
+#endif /* !(COMPILER_STATEMENT_EXPRESSIONS && COMPILER_TYPEOF) */
+
+/*! Bound \a x between \a min and \a max. */
+#define MINMAX(min,x,max) (MIN(MAX(min, x), max))
+
+#ifdef __cplusplus
+ /* Use standard implementation from <algorithm> */
+ #define SWAP(a,b) std::swap(a, b)
+#elif COMPILER_TYPEOF
+ /*!
+ * Type-generic macro to swap \a a with \a b.
+ *
+ * \note Arguments are evaluated multiple times.
+ */
+ #define SWAP(a, b) \
+ do { \
+ (void)(&(a) == &(b)); /* type check */ \
+ typeof(a) tmp; \
+ tmp = (a); \
+ (a) = (b); \
+ (b) = tmp; \
+ } while (0)
+#else /* !COMPILER_TYPEOF */
+ /* Sub-optimal implementation that only works with integral types. */
+ #define SWAP(a, b) ((a) ^= (b) ^= (a) ^= (b))
+#endif /* COMPILER_TYPEOF */
#ifndef BV
-/*! Convert a bit value to a binary flag */
-#define BV(x) (1<<(x))
+ /*! Convert a bit value to a binary flag. */
+ #define BV(x) (1<<(x))
#endif
/*! Round up \a x to an even multiple of the 2's power \a pad */
#define UINT32_LOG2(x) \
((x < 65536UL) ? UINT16_LOG2(x) : UINT16_LOG2((x) >> 16) + 16)
-#if COMPILER_C99
- /*! Count the number of arguments (up to 16) */
+#if COMPILER_VARIADIC_MACROS
+ /*! Count the number of arguments (up to 16). */
#define PP_COUNT(...) \
PP_COUNT__(__VA_ARGS__,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0)
#define PP_COUNT__(a0,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13,a14,a15,count,...) \
count
#endif
-/*! Issue a compilation error if the \a condition is false */
-#define STATIC_ASSERT(condition) \
- extern char PP_CAT(CT_ASSERT___, __LINE__)[(condition) ? 1 : -1]
-
-#if COMPILER_C99
+#if COMPILER_VARIADIC_MACROS
/*!
* \def BIT_CHANGE(reg, (mask, value), ...)
*
* \note This macro is available only in C99 because it makes use of variadic macros.
* It would be possible to make up an implementation with a slightly different syntax
* for use with C90 compilers, through Boost Preprocessor.
- *
*/
/*!
*
* Similar to BIT_CHANGE(), but get bits instead of masks (and applies BV() to convert
* them to masks).
- *
*/
#define BIT_EXTRACT_FLAG_0(bit, value) bit
#define BIT_CHANGE(reg, ...) BIT_CHANGE__(reg, 0, __VA_ARGS__)
#define BIT_CHANGE_BV(reg, ...) BIT_CHANGE__(reg, 1, __VA_ARGS__)
-#endif /* COMPILER_C99 */
+#endif /* COMPILER_VARIADIC_MACROS */
#endif /* MACROS_H */