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Com: Make STATIC_ASSERT macro typedefs unique

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This commit is contained in:
JJL772
2023-07-07 13:16:21 -07:00
committed by Michael Davidsaver
parent 92cae86ff2
commit 395015aac4
1 changed files with 11 additions and 3 deletions
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modules/libcom/src/osi/epicsAssert.h
+11 -3
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@@ -78,14 +78,22 @@ LIBCOM_API void epicsAssert (const char *pFile, const unsigned line,
#if __cplusplus>=201103L
#define STATIC_ASSERT(expr) static_assert(expr, #expr)
#else
#define STATIC_JOIN(x, y) STATIC_JOIN2(x, y)
#define STATIC_JOIN2(x, y) x ## y
#define STATIC_JOIN(x, y, z, w) STATIC_JOIN4(x, y, z, w)
#define STATIC_JOIN4(x, y, z, w) x ## y ## z ## w
/* Compilers that do not support __COUNTER__ (e.g. GCC 4.1) will not be able to use unique static assert typedefs */
#ifdef __COUNTER__
# define STATIC_ASSERT_MSG(l) STATIC_JOIN(static_assert_, __COUNTER__, _failed_at_line_, l)
#else
# define STATIC_ASSERT_MSG(l) STATIC_JOIN(static_assert_, 0, _failed_at_line_, l)
#endif
/**\brief Declare a condition that should be true at compile-time.
* \param expr A C/C++ const-expression that should evaluate to True.
*/
#define STATIC_ASSERT(expr) \
typedef int STATIC_JOIN(static_assert_failed_at_line_, __LINE__) \
typedef int STATIC_ASSERT_MSG(__LINE__) \
[ (expr) ? 1 : -1 ] EPICS_UNUSED
#endif