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std-aux: add NM_ENSURE_IS_TYPE() macro

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Thomas Haller 2021-06-10 11:05:57 +02:00
parent cf1b7d43df
commit ae14caf05d
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1 changed files with 6 additions and 0 deletions
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6
src/libnm-std-aux/nm-std-aux.h
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@ -192,6 +192,12 @@ typedef uint64_t _nm_bitwise nm_be64_t;
#define NM_N_ELEMENTS(arr) (sizeof(arr) / sizeof((arr)[0])) #define NM_N_ELEMENTS(arr) (sizeof(arr) / sizeof((arr)[0]))
/* This does a compile time check that "type" is a suitable C type. It either
* returns a compile time constant of 1 or it fails compilation. The point
* is only in macros to check that a macro parameter (what we might pass to
* sizeof() is really a type, and not a variable. */
#define NM_ENSURE_IS_TYPE(type) (sizeof(void (*)(type[])) == sizeof(void (*)(void *)))
/*****************************************************************************/ /*****************************************************************************/
static inline uint32_t static inline uint32_t