Implement compare_objects handler for ReadConcern

Author: paulinevos

src/MongoDB/ReadConcern.c

@@ -216,12 +216,36 @@ static HashTable* phongo_readconcern_get_properties(zend_object* object)
 	return phongo_readconcern_get_properties_hash(object, false);
 }
 
+static int phongo_readconcern_compare_objects(zval* o1, zval* o2)
+{
+	ZEND_COMPARE_OBJECTS_FALLBACK(o1, o2);
+
+	phongo_readconcern_t*	intern1;
+	phongo_readconcern_t*	intern2;
+	int retval;
+
+	intern1 = Z_READCONCERN_OBJ_P(o1);
+	intern2	= Z_READCONCERN_OBJ_P(o2);
+
+	retval = strcmp(
+		mongoc_read_concern_get_level(intern1->read_concern),
+		mongoc_read_concern_get_level(intern2->read_concern)
+	);
+
+	if (retval != 0) {
+		return retval;
+	}
+
+	return 0;
+}
+
 void phongo_readconcern_init_ce(INIT_FUNC_ARGS)
 {
 	phongo_readconcern_ce                = register_class_MongoDB_Driver_ReadConcern(phongo_serializable_ce);
 	phongo_readconcern_ce->create_object = phongo_readconcern_create_object;
 
 	memcpy(&phongo_handler_readconcern, phongo_get_std_object_handlers(), sizeof(zend_object_handlers));
+	phongo_handler_readconcern.compare        = phongo_readconcern_compare_objects;
 	phongo_handler_readconcern.get_debug_info = phongo_readconcern_get_debug_info;
 	phongo_handler_readconcern.get_properties = phongo_readconcern_get_properties;
 	phongo_handler_readconcern.free_obj       = phongo_readconcern_free_object;

tests/readConcern/readconcern-compare-001.phpt

@@ -0,0 +1,21 @@
+--TEST--
+MongoDB\BSON\ReadConcern comparisons
+--FILE--
+<?php
+
+var_dump(new MongoDB\Driver\ReadConcern(MongoDB\Driver\ReadConcern::LOCAL) == new MongoDB\Driver\ReadConcern(MongoDB\Driver\ReadConcern::LOCAL));
+var_dump(new MongoDB\Driver\ReadConcern(MongoDB\Driver\ReadConcern::LOCAL) > new MongoDB\Driver\ReadConcern(MongoDB\Driver\ReadConcern::AVAILABLE));
+var_dump(new MongoDB\Driver\ReadConcern(MongoDB\Driver\ReadConcern::LOCAL) < new MongoDB\Driver\ReadConcern(MongoDB\Driver\ReadConcern::AVAILABLE));
+
+// Object comparison fallback if one value is not a ReadConcern
+var_dump(new MongoDB\Driver\ReadConcern() > new MongoDB\BSON\Int64('8589934592'));
+
+?>
+===DONE===
+<?php exit(0); ?>
+--EXPECT--
+bool(true)
+bool(true)
+bool(false)
+bool(false)
+===DONE===