# Wrapper for `mongoc_collection_count()`.
	#
	# This function shall execute a count `query` on the underlying collection.
	fun count(query: NativeBSON): Int import set_mongoc_error `{
		bson_error_t error;
		int64_t count = mongoc_collection_count(self, MONGOC_QUERY_NONE, query, 0, 0, NULL, &error);
		if(count < 0) {
			NativeMongoCollection_set_mongoc_error(self, &error);
			return -1;
		}
		return count;
	`}