result.h

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 <utility>
 
#include "graphar/fwd.h"
#include "graphar/status.h"
 
#define GAR_ASSIGN_OR_RAISE_IMPL(result_name, lhs, rexpr)          \
  auto&& result_name = (rexpr);                                    \
  GAR_RETURN_IF_((result_name).has_error(), (result_name).error(), \
                 GAR_STRINGIFY(rexpr));                            \
  lhs = std::move(result_name).value();
 
#define GAR_ASSIGN_OR_RAISE_ERROR_IMPL(result_name, lhs, rexpr)         \
  auto&& result_name = (rexpr);                                         \
  GAR_RAISE_ERROR_IF_((result_name).has_error(), (result_name).error(), \
                      GAR_STRINGIFY(rexpr));                            \
  lhs = std::move(result_name).value();
 
#define GAR_ASSIGN_OR_RAISE_NAME(x, y) GAR_CONCAT(x, y)
 
#define GAR_ASSIGN_OR_RAISE(lhs, rexpr) \
  GAR_ASSIGN_OR_RAISE_IMPL(             \
      GAR_ASSIGN_OR_RAISE_NAME(_error_or_value, __COUNTER__), lhs, rexpr);
 
#define GAR_ASSIGN_OR_RAISE_ERROR(lhs, rexpr) \
  GAR_ASSIGN_OR_RAISE_ERROR_IMPL(             \
      GAR_ASSIGN_OR_RAISE_NAME(_error_or_value, __COUNTER__), lhs, rexpr);
 
#define GAR_RETURN_ON_ARROW_ERROR_AND_ASSIGN_IMPL(result_name, lhs, rexpr) \
  auto&& result_name = (rexpr);                                            \
  if (!result_name.status().ok()) {                                        \
    return ::graphar::Status::ArrowError(result_name.status().ToString()); \
  }                                                                        \
  lhs = std::move(result_name).ValueOrDie();
 
#define GAR_RETURN_ON_ARROW_ERROR_AND_ASSIGN(lhs, rexpr) \
  GAR_RETURN_ON_ARROW_ERROR_AND_ASSIGN_IMPL(             \
      GAR_ASSIGN_OR_RAISE_NAME(_error_or_value, __COUNTER__), lhs, rexpr);
 
namespace graphar::internal {
 
// Extract Status from Status or Result<T>
// Useful for the status check macros such as RETURN_NOT_OK.
template <typename T>
inline const Status& GenericToStatus(const Result<T>& res) {
  return res.status();
}
template <typename T>
inline Status GenericToStatus(Result<T>&& res) {
  return std::move(res).status();
}
 
}  // namespace graphar::internal