text: /*
   * Copyright 2019 Google 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
   *
   *     https://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 UTIL_STATUS_MACROS_H_
  #define UTIL_STATUS_MACROS_H_
  
  #include "absl/base/port.h"
  #include "absl/status/status.h"
  #include "absl/status/statusor.h"
  
  // Helper macro that checks if the right hand side (rexpression) evaluates to a
  // StatusOr with Status OK, and if so assigns the value to the value on the left
  // hand side (lhs), otherwise returns the error status. Example:
  //   ASSIGN_OR_RETURN(lhs, rexpression);
  #define ASSIGN_OR_RETURN(lhs, rexpr)                                          \
    PRIVACY_BLINDERS_ASSIGN_OR_RETURN_IMPL_(                                    \
        PRIVACY_BLINDERS_STATUS_MACROS_IMPL_CONCAT_(status_or_value, __LINE__), \
        lhs, rexpr)
  
  // Internal helper.
  #define PRIVACY_BLINDERS_ASSIGN_OR_RETURN_IMPL_(statusor, lhs, rexpr) \
    auto statusor = (rexpr);                                            \
    if (ABSL_PREDICT_FALSE(!statusor.ok())) {                           \
      return std::move(statusor).status();                              \
    }                                                                   \
    lhs = std::move(statusor).value()
  
  // Internal helper for concatenating macro values.
  #define PRIVACY_BLINDERS_STATUS_MACROS_IMPL_CONCAT_INNER_(x, y) x##y
  #define PRIVACY_BLINDERS_STATUS_MACROS_IMPL_CONCAT_(x, y) \
    PRIVACY_BLINDERS_STATUS_MACROS_IMPL_CONCAT_INNER_(x, y)
  
  #endif  // UTIL_STATUS_MACROS_H_
  