1 /*
2  * Copyright (C) 2020 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #pragma once
18 
19 #if !defined(MAJOR_VERSION) || !defined(MINOR_VERSION)
20 #error "MAJOR_VERSION and MINOR_VERSION must be defined"
21 #endif
22 
23 /** Allows macro expansion for x and add surrounding `<>`.
24  * Is intended to be used for version dependant includes as
25  * `#include` do not macro expand if starting with < or "
26  * Example usage:
27  *      #include PATH(path/to/FILE_VERSION/file)
28  * @note: uses the implementation-define "Computed Includes" feature.
29  */
30 #define PATH(x) <x>
31 
32 #define CONCAT_3(a, b, c) a##b##c
33 #define EXPAND_CONCAT_3(a, b, c) CONCAT_3(a, b, c)
34 /** The directory name of the version: <major>.<minor> */
35 #define FILE_VERSION EXPAND_CONCAT_3(MAJOR_VERSION, ., MINOR_VERSION)
36 
37 #define CONCAT_4(a, b, c, d) a##b##c##d
38 #define EXPAND_CONCAT_4(a, b, c, d) CONCAT_4(a, b, c, d)
39 /** The c++ namespace of the version: V<major>_0.
40  * Always use minor version 0's namespace. If minor version is not zero, use
41  * the full namespace path explicitly.
42  */
43 #define CPP_VERSION EXPAND_CONCAT_4(V, MAJOR_VERSION, _, 0)
44