/* Copyright 2015 The TensorFlow Authors. All Rights Reserved.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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==============================================================================*/
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// Helper macros for dealing with the port::Status datatype.
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#ifndef TENSORFLOW_STREAM_EXECUTOR_LIB_STATUS_MACROS_H_
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#define TENSORFLOW_STREAM_EXECUTOR_LIB_STATUS_MACROS_H_
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// Early-returns the status if it is in error; otherwise, proceeds.
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//
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// The argument expression is guaranteed to be evaluated exactly once.
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#define SE_RETURN_IF_ERROR(__status) \
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do { \
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auto status = __status; \
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if (!status.ok()) { \
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return status; \
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} \
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} while (false)
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// Identifier concatenation helper macros.
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#define SE_MACRO_CONCAT_INNER(__x, __y) __x##__y
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#define SE_MACRO_CONCAT(__x, __y) SE_MACRO_CONCAT_INNER(__x, __y)
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// Implementation of SE_ASSIGN_OR_RETURN that uses a unique temporary identifier
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// for avoiding collision in the enclosing scope.
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#define SE_ASSIGN_OR_RETURN_IMPL(__lhs, __rhs, __name) \
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auto __name = (__rhs); \
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if (!__name.ok()) { \
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return __name.status(); \
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} \
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__lhs = std::move(__name.ValueOrDie());
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// Early-returns the status if it is in error; otherwise, assigns the
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// right-hand-side expression to the left-hand-side expression.
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//
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// The right-hand-side expression is guaranteed to be evaluated exactly once.
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#define SE_ASSIGN_OR_RETURN(__lhs, __rhs) \
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SE_ASSIGN_OR_RETURN_IMPL(__lhs, __rhs, \
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SE_MACRO_CONCAT(__status_or_value, __COUNTER__))
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#endif // TENSORFLOW_STREAM_EXECUTOR_LIB_STATUS_MACROS_H_
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