diff options
Diffstat (limited to 'src/include/nodes/bitmapset.h')
| -rw-r--r-- | src/include/nodes/bitmapset.h | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/src/include/nodes/bitmapset.h b/src/include/nodes/bitmapset.h index c344ac04bec..14de6a9ff1e 100644 --- a/src/include/nodes/bitmapset.h +++ b/src/include/nodes/bitmapset.h @@ -5,10 +5,8 @@ * * A bitmap set can represent any set of nonnegative integers, although * it is mainly intended for sets where the maximum value is not large, - * say at most a few hundred. By convention, a NULL pointer is always - * accepted by all operations to represent the empty set. (But beware - * that this is not the only representation of the empty set. Use - * bms_is_empty() in preference to testing for NULL.) + * say at most a few hundred. By convention, we always represent the + * empty set by a NULL pointer. * * * Copyright (c) 2003-2023, PostgreSQL Global Development Group @@ -102,7 +100,9 @@ extern int bms_num_members(const Bitmapset *a); /* optimized tests when we don't need to know exact membership count: */ extern BMS_Membership bms_membership(const Bitmapset *a); -extern bool bms_is_empty(const Bitmapset *a); + +/* NULL is now the only allowed representation of an empty bitmapset */ +#define bms_is_empty(a) ((a) == NULL) /* these routines recycle (modify or free) their non-const inputs: */ |