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* Provide alternative for M_STATIC_ASSERT in GNUC + C11 with improved error messages

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* Add internal macro M_CHECK_COMPATIBLE_OPLIST to check if a type and an oplist could match.
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Patrick Pelissier committed 2020-05-17 09:36:50 +02:00
1 parent 4668476c6a
commit c59731775e
1 file changed
+39
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m-core.h
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@@ -2219,6 +2219,42 @@ m_core_hash (const void *str, size_t length)
"The variable " M_AS_STR(a) " and " M_AS_STR(b) \
" are not of same type.")
/* Check if the oplist is compatible with the type.
The oplist should define a TYPE method, in which case it is tested.
If it is not exported, do nothing.
Compare the type in C11, the size in C99 or C++ */
#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
#define M_CHECK_COMPATIBLE_OPLIST(name, type, oplist) \
M_IF_METHOD(TYPE, oplist) \
( \
static inline void M_C(name, _int_control_type)(void) \
{ \
type x; \
M_STATIC_ASSERT(_Generic(&x, \
M_GET_TYPE oplist *: 1 /* Ok, type matches */, \
default: 0 /* NOK, type doesn't match */ ), \
M_LIB_TYPE_MISTMACH, \
"The given type " M_AS_STR(type) \
" and the type of the oplist does not match: " \
M_AS_STR(oplist) ); \
} \
, /* End of TYPE */)
#else
#define M_CHECK_COMPATIBLE_OPLIST(name, type, oplist) \
M_IF_METHOD(TYPE, oplist) \
( \
static inline void M_C(name, _int_control_type)(void) \
{ \
M_STATIC_ASSERT(sizeof (type) == sizeof (M_GET_TYPE oplist), \
M_LIB_TYPE_MISTMACH, \
"The given type " M_AS_STR(type) \
" and the type of the oplist does not match: " \
M_AS_STR(oplist) ); \
} \
, /* End of TYPE */)
#endif
/* Define the default method.
NOTE: M_SET_DEFAULT may be called in conditions where a and b
are different but compatible type.
@@ -2717,6 +2753,9 @@ m_core_hash (const void *str, size_t length)
#if defined(__cplusplus)
# define M_STATIC_ASSERT(cond, error, msg) \
([] { static_assert(cond, #error ": " msg); } ())
#elif defined(__GNUC__) && defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
# define M_STATIC_ASSERT(cond, error, msg) \
M_ATTR_EXTENSION ({ static_assert(cond, #error ": " msg); })
#else
# define M_STATIC_ASSERT(cond, error, msg) \
((void) sizeof(struct { int error : !!(cond);}))