src/kudu/util/status_callback.h

// Copyright 2014 Cloudera, Inc.
//
// 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 KUDU_UTIL_STATUS_CALLBACK_H
#define KUDU_UTIL_STATUS_CALLBACK_H

#include "kudu/gutil/callback_forward.h"

namespace kudu {

class Status;

// A callback which takes a Status. This is typically used for functions which
// produce asynchronous results and may fail.
typedef Callback<void(const Status& status)> StatusCallback;

// To be used when a function signature requires a StatusCallback but none
// is needed.
extern void DoNothingStatusCB(const Status& status);

// A closure (callback without arguments) that returns a Status indicating
// whether it was successful or not.
typedef Callback<Status(void)> StatusClosure;

// To be used when setting a StatusClosure is optional.
extern Status DoNothingStatusClosure();

} // namespace kudu

#endif