status.h

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// Copyright (c) 2017, The Regents of the University of California
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
// * Redistributions of source code must retain the above copyright
//   notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
//   notice, this list of conditions and the following disclaimer in the
//   documentation and/or other materials provided with the distribution.
// * Neither the name of the University of California nor the
//   names of its contributors may be used to endorse or promote products
//   derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
// BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.

// Status is the common return type of our functions.

#ifndef UTIL_STATUS_H_
#define UTIL_STATUS_H_

#include <iosfwd>
#include <string>

namespace util {

namespace error {
enum Code {
  OK = 0,
  CANCELLED = 1,
  UNKNOWN = 2,
  INVALID_ARGUMENT = 3,
  DEADLINE_EXCEEDED = 4,
  NOT_FOUND = 5,
  ALREADY_EXISTS = 6,
  PERMISSION_DENIED = 7,
  UNAUTHENTICATED = 16,
  RESOURCE_EXHAUSTED = 8,
  FAILED_PRECONDITION = 9,
  ABORTED = 10,
  OUT_OF_RANGE = 11,
  UNIMPLEMENTED = 12,
  INTERNAL = 13,
  UNAVAILABLE = 14,
  DATA_LOSS = 15,
};
}  // namespace error

class Status {
 public:
  // Creates a "successful" status.
  Status();

  // Create a status in the canonical error space with the specified
  // code, and error message.  If "code == 0", error_message is
  // ignored and a Status object identical to Status::OK is
  // constructed.
  Status(error::Code error_code, std::string error_message);
  Status(const Status&);
  Status& operator=(const Status& x);
  ~Status() {}

  // Some pre-defined Status objects
  static const Status OK;             // Identical to 0-arg constructor
  static const Status CANCELLED;
  static const Status UNKNOWN;

  // Accessor
  bool ok() const {
    return error_code_ == error::OK;
  }
  int error_code() const {
    return error_code_;
  }
  std::string error_message() const {
    return error_message_;
  }

  bool operator==(const Status& x) const;
  bool operator!=(const Status& x) const {
    return !operator==(x);
  }

  // Return a combination of the error code name and message.
  std::string ToString() const;

 private:
  error::Code error_code_;
  std::string error_message_;
};

// Prints a human-readable representation of 'x' to 'os'.
std::ostream& operator<<(std::ostream& os, const Status& x);

#define EXPECT_OK(value) EXPECT_TRUE((value).ok())
#define CHECK_OK(value) CHECK((value).ok())
#define DCHECK_OK(value) DCHECK((value).ok())

}  // namespace util

#endif  // UTIL_STATUS_H_


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// Copyright 2008 Google Inc.  All rights reserved.
// https://developers.google.com/protocol-buffers/
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//     * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.