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90 lines
3.7 KiB
C++
90 lines
3.7 KiB
C++
// Protocol Buffers - Google's data interchange format
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// Copyright 2008 Google Inc. All rights reserved.
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// https://developers.google.com/protocol-buffers/
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// From: util/task/contrib/status_macros/status_macros.h
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#ifndef GOOGLE_PROTOBUF_STUBS_STATUS_MACROS_H_
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#define GOOGLE_PROTOBUF_STUBS_STATUS_MACROS_H_
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#include <thirdparty/protobuf/stubs/common.h>
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#include <thirdparty/protobuf/stubs/status.h>
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#include <thirdparty/protobuf/stubs/statusor.h>
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namespace google {
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namespace protobuf {
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namespace util {
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// Run a command that returns a util::Status. If the called code returns an
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// error status, return that status up out of this method too.
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//
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// Example:
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// RETURN_IF_ERROR(DoThings(4));
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#define RETURN_IF_ERROR(expr) \
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do { \
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/* Using _status below to avoid capture problems if expr is "status". */ \
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const PROTOBUF_NAMESPACE_ID::util::Status _status = (expr); \
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if (PROTOBUF_PREDICT_FALSE(!_status.ok())) return _status; \
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} while (0)
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// Internal helper for concatenating macro values.
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#define STATUS_MACROS_CONCAT_NAME_INNER(x, y) x##y
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#define STATUS_MACROS_CONCAT_NAME(x, y) STATUS_MACROS_CONCAT_NAME_INNER(x, y)
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template<typename T>
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Status DoAssignOrReturn(T& lhs, StatusOr<T> result) {
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if (result.ok()) {
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lhs = result.value();
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}
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return result.status();
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}
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#define ASSIGN_OR_RETURN_IMPL(status, lhs, rexpr) \
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Status status = DoAssignOrReturn(lhs, (rexpr)); \
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if (PROTOBUF_PREDICT_FALSE(!status.ok())) return status;
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// Executes an expression that returns a util::StatusOr, extracting its value
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// into the variable defined by lhs (or returning on error).
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//
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// Example: Assigning to an existing value
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// ValueType value;
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// ASSIGN_OR_RETURN(value, MaybeGetValue(arg));
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//
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// WARNING: ASSIGN_OR_RETURN expands into multiple statements; it cannot be used
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// in a single statement (e.g. as the body of an if statement without {})!
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#define ASSIGN_OR_RETURN(lhs, rexpr) \
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ASSIGN_OR_RETURN_IMPL( \
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STATUS_MACROS_CONCAT_NAME(_status_or_value, __COUNTER__), lhs, rexpr);
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} // namespace util
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} // namespace protobuf
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} // namespace google
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#endif // GOOGLE_PROTOBUF_STUBS_STATUS_H_
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