1 /*
2  * Copyright (c) 2024 Huawei Device Co., Ltd.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at
6  *
7  *     http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 
16 #ifndef META_INTERFACE_ICOMPARABLE_H
17 #define META_INTERFACE_ICOMPARABLE_H
18 
19 #include <core/plugin/intf_interface.h>
20 
21 #include <meta/base/types.h>
22 
23 META_BEGIN_NAMESPACE()
24 
25 META_REGISTER_INTERFACE(IComparable, "aae8a240-8a99-4edc-869e-3b87f42e37a0")
26 
27 /**
28  * @brief The IComparable interface to indicate entity can be compared
29  */
30 class IComparable : public CORE_NS::IInterface {
31     META_INTERFACE(CORE_NS::IInterface, IComparable)
32 public:
33     /**
34      * @brief Compare given object to this one.
35      *        0 on equal, negative if this is less than, positive if this is greater than.
36      */
37     virtual int Compare(const IComparable::Ptr&) const = 0;
38 };
39 
40 META_END_NAMESPACE()
41 
42 #endif
43