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- /*
- * Copyright 2020 Google LLC
- *
- * 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 RLWE_STATUS_MACROS_H_
- #define RLWE_STATUS_MACROS_H_
- #include "absl/status/status.h"
- #include "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:
- // RLWE_RLWE_ASSIGN_OR_RETURN(lhs, rexpression);
- #define RLWE_ASSIGN_OR_RETURN(lhs, rexpr) \
- RLWE_ASSIGN_OR_RETURN_IMPL_( \
- RLWE_STATUS_MACROS_IMPL_CONCAT_(_status_or_value, __LINE__), lhs, rexpr)
- // Internal helper.
- #define RLWE_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 RLWE_STATUS_MACROS_IMPL_CONCAT_INNER_(x, y) x##y
- #define RLWE_STATUS_MACROS_IMPL_CONCAT_(x, y) \
- RLWE_STATUS_MACROS_IMPL_CONCAT_INNER_(x, y)
- #define RLWE_RETURN_IF_ERROR(expr) \
- RLWE_RETURN_IF_ERROR_IMPL_( \
- RLWE_STATUS_MACROS_IMPL_CONCAT_(_status, __LINE__), expr)
- #define RLWE_RETURN_IF_ERROR_IMPL_(status, expr) \
- auto status = (expr); \
- if (ABSL_PREDICT_FALSE(!status.ok())) { \
- return status; \
- }
- #endif // RLWE_STATUS_MACROS_H_
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