Function AttributeSet_Update

src/graph/entities/attribute_set.c:334–370

updates existing attribute, return true if attribute been updated

// updates existing attribute, return true if attribute been updated
bool AttributeSet_Update
(
	AttributeSet *set,     // set to update
	Attribute_ID attr_id,  // attribute identifier
	SIValue value          // new value
) {
	ASSERT(set != NULL);
	ASSERT(attr_id != ATTRIBUTE_ID_NONE);

	AttributeSet _set = *set;

	// return if set is read-only
	if(unlikely(ATTRIBUTE_SET_IS_READONLY(_set))) {
		return false;
	}

	ASSERT(_set != NULL);

	// setting an attribute value to NULL removes that attribute
	if(unlikely(SIValue_IsNull(value))) {
		return _AttributeSet_Remove(set, attr_id);
	}

	SIValue *current = AttributeSet_Get(_set, attr_id);
	ASSERT(current != ATTRIBUTE_NOTFOUND);

	// compare current value to new value, only update if current != new
	if(unlikely(SIValue_Compare(*current, value, NULL) == 0)) {
		return false;
	}

	// value != current, update entity
	SIValue_Free(*current);  // free previous value
	*current = SI_CloneValue(value);

	return true;
}

// clones attribute-set without SI values
AttributeSet AttributeSet_ShallowClone