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nref: clear pointer if refcount reached 0

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This commit is contained in:
anna 2021-07-16 14:12:18 +02:00
parent 7169a434bf
commit a1ac5d8c41
Signed by: fef
GPG key ID: EC22E476DC2D3D84
1 changed files with 5 additions and 2 deletions
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7
include/neo/_nref.h
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@ -40,12 +40,15 @@ int _neo_nput(struct _neo_nref *ref);
* Decrement the reference counter of a structure embedding `NREF_FIELD`. * Decrement the reference counter of a structure embedding `NREF_FIELD`.
* *
* If the counter reaches zero, the destroy callback passed to `nref_init` * If the counter reaches zero, the destroy callback passed to `nref_init`
* is invoked. * is invoked and the pointer is set to `nil` to prevent any further usage.
* *
* @param ptr: The `struct *` to decrement the reference counter of * @param ptr: The `struct *` to decrement the reference counter of
* @returns The new reference count * @returns The new reference count
*/ */
#define nput(ptr) (_neo_nput( &(ptr)->__neo_nref )) #define nput(ptr) ({ \
if (_neo_nput(&(ptr)->__neo_nref) == 0) \
ptr = nil; \
})
/* /*
* This file is part of libneo. * This file is part of libneo.