46 lines
2.1 KiB
C++
46 lines
2.1 KiB
C++
// Copyright 2010-2025 Google LLC
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef ORTOOLS_UTIL_STATUS_MACROS_H_
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#define ORTOOLS_UTIL_STATUS_MACROS_H_
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#include "ortools/base/status_macros.h"
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// Executes an expression that returns an absl::StatusOr, extracting its value
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// into the variable defined by lhs or returning on error and enabling
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// decorating it with the third argument.
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//
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// Example: Assigning to an existing value
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// ValueType value;
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// OR_ASSIGN_OR_RETURN3(value, MaybeGetValue(arg), _ << "context");
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// OR_ASSIGN_OR_RETURN3((auto [key, val]), MaybeGetValue(arg),
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// _ << "with key " << key);
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//
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// WARNING: OR_ASSIGN_OR_RETURN3 expands into multiple statements; it cannot be
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// used in a single statement (e.g. as the body of an if statement without {})!
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//
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#define OR_ASSIGN_OR_RETURN3(lhs, rexpr, error_expression) \
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OR_ASSIGN_OR_RETURN3_IMPL_( \
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STATUS_MACROS_IMPL_CONCAT_(_status_or_value, __COUNTER__), lhs, rexpr, \
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error_expression)
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#define OR_ASSIGN_OR_RETURN3_IMPL_(statusor, lhs, rexpr, error_expression) \
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auto statusor = (rexpr); \
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if (!statusor.ok()) { \
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::util::StatusBuilder _(std::move(statusor).status()); \
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return (error_expression); \
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} \
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STATUS_MACROS_IMPL_UNPARENTHESIS(lhs) = std::move(statusor).value()
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#endif // ORTOOLS_UTIL_STATUS_MACROS_H_
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