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macro: add simple DEFER_VOID_CALL() helper

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Lennart Poettering
2025-08-29 23:19:35 +02:00
parent 32e0af0835
commit 71f3f1818f
1 changed files with 13 additions and 0 deletions
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13
src/basic/macro.h
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@@ -206,3 +206,16 @@ static inline size_t size_add(size_t x, size_t y) {
for (typeof(entry) _va_sentinel_[1] = {}, _entries_[] = { __VA_ARGS__ __VA_OPT__(,) _va_sentinel_[0] }, *_current_ = _entries_; \
((long)(_current_ - _entries_) < (long)(ELEMENTSOF(_entries_) - 1)) && ({ entry = *_current_; true; }); \
_current_++)
typedef void (*void_func_t)(void);
static inline void dispatch_void_func(void_func_t *f) {
assert(f);
assert(*f);
(*f)();
}
/* Inspired by Go's "defer" construct, but much more basic. This basically just calls a void function when
* the current scope is left. Doesn't do function parameters (i.e. no closures). */
#define DEFER_VOID_CALL(x) _DEFER_VOID_CALL(UNIQ, x)
#define _DEFER_VOID_CALL(uniq, x) _unused_ _cleanup_(dispatch_void_func) void_func_t UNIQ_T(defer, uniq) = (x)