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Add static assertion and use it for move/copy/cmp default

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Patrick Pelissier committed 2019-11-29 23:13:28 +01:00
1 parent 7fe36f7bd7
commit 3489bb42bc
1 file changed
+15 -9
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m-core.h
+15 -9
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@@ -2153,11 +2153,11 @@ m_core_hash (const void *str, size_t length)
/* NOTE: Theses operators are NOT compatible with the '[1]' tricks
if the variable is defined as a parameter of a function
(sizeof (a) is not portable). */
#define M_MOVE_DEFAULT(a,b) (M_MEMCPY_DEFAULT(a, b), memset(&(b), 0, sizeof (a)))
#define M_MEMCPY_DEFAULT(a,b) (memcpy(&(a), &(b), sizeof (a)))
#define M_MOVE_DEFAULT(a,b) (M_STATIC_ASSERT(sizeof(a)==sizeof(b)), M_MEMCPY_DEFAULT(a, b), memset(&(b), 0, sizeof (a)))
#define M_MEMCPY_DEFAULT(a,b) (M_STATIC_ASSERT(sizeof(a)==sizeof(b)), memcpy(&(a), &(b), sizeof (a)))
#define M_MEMSET_DEFAULT(a) (memset(&(a), 0, sizeof (a)))
#define M_MEMCMP1_DEFAULT(a,b) (memcmp(&(a), &(b), sizeof (a)) == 0)
#define M_MEMCMP2_DEFAULT(a,b) (memcmp(&(a), &(b), sizeof (a)))
#define M_MEMCMP1_DEFAULT(a,b) (M_STATIC_ASSERT(sizeof(a)==sizeof(b)), memcmp(&(a), &(b), sizeof (a)) == 0)
#define M_MEMCMP2_DEFAULT(a,b) (M_STATIC_ASSERT(sizeof(a)==sizeof(b)), memcmp(&(a), &(b), sizeof (a)))
#define M_SWAP_DEFAULT(el1, el2) do { \
char _tmp[sizeof (el1)]; \
memcpy(&_tmp, &(el1), sizeof (el1)); \
@@ -2168,11 +2168,11 @@ m_core_hash (const void *str, size_t length)
/* NOTE: Theses operators are to be used with the '[1]' tricks
if the variable is defined as a parameter of a function
(sizeof (a) is not portable). */
#define M_MOVE_A1_DEFAULT(a,b) (M_MEMCPY_A1_DEFAULT(a, b), M_MEMSET_A1_DEFAULT(b))
#define M_MEMCPY_A1_DEFAULT(a,b) (memcpy(&(a[0]), &(b[0]), sizeof (a[0])))
#define M_MEMSET_A1_DEFAULT(a) (memset(&(a[0]), 0, sizeof (a[0])))
#define M_MEMCMP1_A1_DEFAULT(a,b) (memcmp(&(a[0]), &(b[0]), sizeof (a[0])) == 0)
#define M_MEMCMP2_A1_DEFAULT(a,b) (memcmp(&(a[0]), &(b[0]), sizeof (a[0])))
#define M_MOVE_A1_DEFAULT(a,b) (M_STATIC_ASSERT(sizeof(a)==sizeof(b)), M_MEMCPY_A1_DEFAULT(a, b), M_MEMSET_A1_DEFAULT(b))
#define M_MEMCPY_A1_DEFAULT(a,b) (M_STATIC_ASSERT(sizeof(a)==sizeof(b)), memcpy(&(a[0]), &(b[0]), sizeof (a[0])))
#define M_MEMSET_A1_DEFAULT(a) (M_STATIC_ASSERT(sizeof(a)==sizeof(b)), memset(&(a[0]), 0, sizeof (a[0])))
#define M_MEMCMP1_A1_DEFAULT(a,b) (M_STATIC_ASSERT(sizeof(a)==sizeof(b)), memcmp(&(a[0]), &(b[0]), sizeof (a[0])) == 0)
#define M_MEMCMP2_A1_DEFAULT(a,b) (M_STATIC_ASSERT(sizeof(a)==sizeof(b)), memcmp(&(a[0]), &(b[0]), sizeof (a[0])))
#define M_HASH_A1_DEFAULT(a) (m_core_hash((const void*) &(a[0]), sizeof (a[0])) )
/* Default oplist for plain structure */
@@ -2532,6 +2532,7 @@ m_core_hash (const void *str, size_t length)
} while (0)
#endif
/* Always perform a runtime check of the condition */
#ifndef M_ASSERT_INIT
#define M_ASSERT_INIT(expr, object) { \
if (!(expr)) { \
@@ -2541,6 +2542,11 @@ m_core_hash (const void *str, size_t length)
} } while (0)
#endif
/* Force a compilation error if condition is false
In this case, it raises "error: negative width in bit-field <anonymous>" */
#define M_STATIC_ASSERT(_e) ((void) sizeof(struct { int a:1; int :-!(_e); }))
/************************************************************/
/******************* Exponential Backoff ********************/