status_macros.h | Explore in Territory

// Protocol Buffers - Google's data interchange format
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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) …

// Internal helper for concatenating macro values.
#define STATUS_MACROS_CONCAT_NAME_INNER(x, y) …
#define STATUS_MACROS_CONCAT_NAME(x, y) …

template<typename T>
Status DoAssignOrReturn(T& lhs, StatusOr<T> result) { … }

#define ASSIGN_OR_RETURN_IMPL(status, lhs, rexpr) …

// 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) …

}  // namespace util
}  // namespace protobuf
}  // namespace google

#endif  // GOOGLE_PROTOBUF_STUBS_STATUS_H_
chromium/third_party/protobuf/src/google/protobuf/stubs/status_macros.h
