1 /*
2  * Copyright (C) 2021 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 #pragma once
17 
18 #include <error/expected_utils.h>
19 #include <utils/Errors.h>
20 
21 namespace android {
22 namespace error {
23 
24 /**
25  * A convenience short-hand for base::expected, where the error type is a status_t.
26  */
27 template <typename T>
28 using Result = base::expected<T, status_t>;
29 
30 }  // namespace error
31 }  // namespace android
32 
33 // Below are the implementations of errorIsOk and errorToString for status_t .
34 // This allows status_t to be used in conjunction with the expected_utils.h macros.
35 // Unfortuantely, since status_t is merely a typedef for int rather than a unique type, we have to
36 // overload these methods for any int, and do so in the global namespace for ADL to work.
37 
errorIsOk(int status)38 inline bool errorIsOk(int status) {
39     return status == android::OK;
40 }
41 
errorToString(int status)42 inline std::string errorToString(int status) {
43     return android::statusToString(status);
44 }
45