| /* |
| * Copyright (C) 2017 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| #pragma once |
| |
| #include <stdio.h> |
| #include <stdarg.h> |
| |
| #include <string> |
| |
| class Result { |
| public: |
| static Result success() { |
| return Result(true); |
| } |
| // Construct a result indicating an error. |
| static Result error(std::string message) { |
| return Result(message); |
| } |
| static Result error(const char* format, ...) { |
| char buffer[1024]; |
| va_list args; |
| va_start(args, format); |
| vsnprintf(buffer, sizeof(buffer), format, args); |
| va_end(args); |
| buffer[sizeof(buffer) - 1] = '\0'; |
| return Result(std::string(buffer)); |
| } |
| |
| bool isSuccess() const { return mSuccess; } |
| bool operator!() const { return !mSuccess; } |
| |
| const char* c_str() const { return mMessage.c_str(); } |
| private: |
| explicit Result(bool success) : mSuccess(success) { } |
| explicit Result(std::string message) |
| : mMessage(message), mSuccess(false) { |
| } |
| std::string mMessage; |
| bool mSuccess; |
| }; |
| |