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glib-aux: add NM_CAST_PPTR() macro

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Thomas Haller 2021-04-15 21:00:09 +02:00
parent 457be83839
commit 4efc6f030a
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1 changed files with 15 additions and 0 deletions
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15
src/libnm-glib-aux/nm-macros-internal.h
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@ -683,6 +683,21 @@ NM_G_ERROR_MSG(GError *error)
#define NM_STRUCT_OFFSET_ENSURE_TYPE(type, container, field) G_STRUCT_OFFSET(container, field)
#endif
/* Casts (arg) to (type**), but also having a compile time check that
* the arg is some sort of pointer to a pointer.
*
* The only purpose of this macro is some additional compile time safety,
* that the argument is a pointer to pointer. But then it will C cast any kind
* of such argument. */
#define NM_CAST_PPTR(type, arg) \
({ \
typeof(*(arg)) *const _arg = (arg); \
typeof(*_arg) _arg2 = _arg ? *_arg : NULL; \
_nm_unused const void *const _arg3 = _arg2; \
\
(type **) _arg; \
})
#if _NM_CC_SUPPORT_GENERIC
/* these macros cast (value) to
* - "const char **" (for "MC", mutable-const)