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// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
// https://developers.google.com/protocol-buffers/
//
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// met:
//
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// From: util/task/contrib/status_macros/status_macros.h
#ifndef GOOGLE_PROTOBUF_STUBS_STATUS_MACROS_H_
#define GOOGLE_PROTOBUF_STUBS_STATUS_MACROS_H_
#include <google/protobuf/stubs/common.h>
#include <google/protobuf/stubs/status.h>
#include <google/protobuf/stubs/statusor.h>
namespace google {
namespace protobuf {
namespace util {
// Run a command that returns a util::Status. If the called code returns an
// error status, return that status up out of this method too.
//
// Example:
// RETURN_IF_ERROR(DoThings(4));
#define RETURN_IF_ERROR(expr) \
do { \
/* Using _status below to avoid capture problems if expr is "status". */ \
const ::google::protobuf::util::Status _status = (expr); \
if (GOOGLE_PREDICT_FALSE(!_status.ok())) return _status; \
} while (0)
// Internal helper for concatenating macro values.
#define STATUS_MACROS_CONCAT_NAME_INNER(x, y) x##y
#define STATUS_MACROS_CONCAT_NAME(x, y) STATUS_MACROS_CONCAT_NAME_INNER(x, y)
template<typename T>
Status DoAssignOrReturn(T& lhs, StatusOr<T> result) {
if (result.ok()) {
lhs = result.ValueOrDie();
}
return result.status();
}
#define ASSIGN_OR_RETURN_IMPL(status, lhs, rexpr) \
Status status = DoAssignOrReturn(lhs, (rexpr)); \
if (GOOGLE_PREDICT_FALSE(!status.ok())) return status;
// Executes an expression that returns a util::StatusOr, extracting its value
// into the variable defined by lhs (or returning on error).
//
// Example: Assigning to an existing value
// ValueType value;
// ASSIGN_OR_RETURN(value, MaybeGetValue(arg));
//
// WARNING: ASSIGN_OR_RETURN expands into multiple statements; it cannot be used
// in a single statement (e.g. as the body of an if statement without {})!
#define ASSIGN_OR_RETURN(lhs, rexpr) \
ASSIGN_OR_RETURN_IMPL( \
STATUS_MACROS_CONCAT_NAME(_status_or_value, __COUNTER__), lhs, rexpr);
} // namespace util
} // namespace protobuf
} // namespace google
#endif // GOOGLE_PROTOBUF_STUBS_STATUS_H_