folly/folly/logging/LogMessage.h

/*
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * 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 <sys/types.h>

#include <chrono>
#include <string>

#include <folly/Range.h>
#include <folly/logging/LogLevel.h>

namespace folly {

class LogCategory;

/**
 * LogMessage represents a single message to be logged.
 *
 * LogMessage objects are relatively temporary objects, that only exist for the
 * time it takes to invoke all of the appropriate LogHandlers.  These generally
 * only live in the thread that logged the message, and are not modified once
 * created.  (That said, LogHandler implementations may copy and store
 * LogMessage objects for later use if desired.)
 */
class LogMessage { … };
} // namespace folly