terminate_handler.h

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// Copyright 2018 Google LLC
//
// 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.

#ifndef GOOGLE_CLOUD_CPP_GOOGLE_CLOUD_TERMINATE_HANDLER_H_
#define GOOGLE_CLOUD_CPP_GOOGLE_CLOUD_TERMINATE_HANDLER_H_

#include "google/cloud/version.h"
#include <functional>

namespace google {
namespace cloud {
inline namespace GOOGLE_CLOUD_CPP_NS {
//@{
/**
 * @name Control behaviour on unrecoverable errors.
 *
 * The following APIs are google::cloud counterpart for
 * std::{set,get}_terminate functions. If exceptions are not enabled via
 * GOOGLE_CLOUD_CPP_HAVE_EXCEPTIONS, calling any function from throw_delegate.h
 * will result in calling the handler installed via this API. By default,
 * a call to std::abort() is used.
 */

/**
 * Terminate handler.
 *
 * It should handle the error, whose description are given in *msg* and should
 * never return.
 */
using TerminateHandler = std::function<void(const char* msg)>;

/**
 * Install terminate handler and get the old one atomically.
 *
 * @param f the handler. It should never return, behaviour is undefined
 *        otherwise.
 *
 * @return Previously set handler.
 */
TerminateHandler SetTerminateHandler(TerminateHandler f);

/**
 * Get the currently installed handler.
 *
 * @return The currently installed handler.
 */
TerminateHandler GetTerminateHandler();

/**
 * Invoke the currently installed handler.
 *
 * @param msg Details about the error.
 *
 * This function should never return.
 *
 */
[[noreturn]] void Terminate(const char* msg);

//@}

}  // namespace GOOGLE_CLOUD_CPP_NS
}  // namespace cloud
}  // namespace google

#endif  // GOOGLE_CLOUD_CPP_GOOGLE_CLOUD_TERMINATE_HANDLER_H_