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spa: utils: spa_exchange(): try to evaluate argument only once

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Barnabás Pőcze 2023-09-16 17:04:19 +02:00
parent 71808454e7
commit 3fec887a5f
1 changed files with 3 additions and 2 deletions
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5
spa/include/spa/utils/cleanup.h
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@ -35,8 +35,9 @@ static inline void _spa_autoptr_cleanup_func_ ## name (__typeof__(type) **thing)
#define spa_exchange(var, new_value) \
__extension__ ({ \
__typeof__(var) _old_value = (var); \
(var) = (new_value); \
__typeof__(var) *_ptr = &(var); \
__typeof__(var) _old_value = *_ptr; \
*_ptr = (new_value); \
_old_value; \
})