If augmentation is not required, then NULL may be passed as the reaugment
function.
---
src/libpspp/abt.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/src/libpspp/abt.c b/src/libpspp/abt.c
index ae746183..d446bcd4 100644
--- a/src/libpspp/abt.c
+++ b/src/libpspp/abt.c
@@ -39,6 +39,11 @@ static struct abt_node **down_link (struct abt *, struct
abt_node *);
static struct abt_node *skew (struct abt *, struct abt_node *);
static struct abt_node *split (struct abt *, struct abt_node *);
+static void
+dummy_augment (struct abt_node *node UNUSED, const void *aux UNUSED)
+{
+}
+
/* Initializes ABT as an empty ABT that uses COMPARE and
REAUGMENT functions, passing in AUX as auxiliary data.
@@ -55,10 +60,11 @@ abt_init (struct abt *abt,
abt_reaugment_func *reaugment,
const void *aux)
{
- assert (reaugment != NULL);
abt->root = NULL;
abt->compare = compare;
abt->reaugment = reaugment;
+ if (abt->reaugment == NULL)
+ abt->reaugment = dummy_augment;
abt->aux = aux;
}
--
2.11.0
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