1 /* 2 * Copyright 2023 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 #include <utils/Trace.h> 20 #include <optional> 21 22 // A macro for tracing when the given condition is true. 23 // This macro relies on the fact that only one branch of the ternary operator is evaluated. That 24 // means if `message` is an expression that evaluates to a std::string value, the value will 25 // not be computed unless the condition is true. 26 #define ATRACE_NAME_IF(condition, message) \ 27 const auto _trace_token = condition \ 28 ? std::make_optional<android::ScopedTrace>(ATRACE_TAG, (message).c_str()) \ 29 : std::nullopt 30