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Diffstat (limited to 'src/google/protobuf/proto_cast.h')
-rw-r--r-- | src/google/protobuf/proto_cast.h | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/src/google/protobuf/proto_cast.h b/src/google/protobuf/proto_cast.h new file mode 100644 index 00000000..e25c219f --- /dev/null +++ b/src/google/protobuf/proto_cast.h @@ -0,0 +1,58 @@ +// Protocol Buffers - Google's data interchange format +// Copyright 2008 Google Inc. All rights reserved. +// https://developers.google.com/protocol-buffers/ +// +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions are +// met: +// +// * Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// * Redistributions in binary form must reproduce the above +// copyright notice, this list of conditions and the following disclaimer +// in the documentation and/or other materials provided with the +// distribution. +// * Neither the name of Google Inc. nor the names of its +// contributors may be used to endorse or promote products derived from +// this software without specific prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +#ifndef GOOGLE_PROTOBUF_UTIL_PROTO_CAST_H__ +#define GOOGLE_PROTOBUF_UTIL_PROTO_CAST_H__ + +#include <string> + +#include <google/protobuf/stubs/common.h> + +// proto_cast<> is used to simulate over-the-wire conversion of one +// proto message into another. This is primarily useful for unit tests +// which validate the version-compatibility semantics of protobufs. +// Usage is similar to C++-style typecasts: +// +// OldMessage old_message = /*...*/; +// NewMessage new_message = proto_cast<NewMessage>(old_message); +namespace google { +template<typename NewProto, + typename OldProto> +NewProto proto_cast(const OldProto& old_proto) { + string wire_format; + GOOGLE_CHECK(old_proto.SerializeToString(&wire_format)); + + NewProto new_proto; + GOOGLE_CHECK(new_proto.ParseFromString(wire_format)); + return new_proto; +} + +} // namespace google +#endif // GOOGLE_PROTOBUF_UTIL_PROTO_CAST_H__ |