1// Protocol Buffers - Google's data interchange format
2// Copyright 2008 Google Inc. All rights reserved.
3// https://developers.google.com/protocol-buffers/
4//
5// Redistribution and use in source and binary forms, with or without
6// modification, are permitted provided that the following conditions are
7// met:
8//
9// * Redistributions of source code must retain the above copyright
10// notice, this list of conditions and the following disclaimer.
11// * Redistributions in binary form must reproduce the above
12// copyright notice, this list of conditions and the following disclaimer
13// in the documentation and/or other materials provided with the
14// distribution.
15// * Neither the name of Google Inc. nor the names of its
16// contributors may be used to endorse or promote products derived from
17// this software without specific prior written permission.
18//
19// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30
31// This file contains helpers for generated code.
32//
33// Nothing in this file should be directly referenced by users of protobufs.
34
35#ifndef GOOGLE_PROTOBUF_GENERATED_MESSAGE_BASES_H__
36#define GOOGLE_PROTOBUF_GENERATED_MESSAGE_BASES_H__
37
38#include <google/protobuf/io/zero_copy_stream_impl.h>
39#include <google/protobuf/arena.h>
40#include <google/protobuf/generated_message_util.h>
41#include <google/protobuf/message.h>
42#include <google/protobuf/parse_context.h>
43
44// Must come last:
45#include <google/protobuf/port_def.inc>
46
47namespace google {
48namespace protobuf {
49namespace internal {
50
51// To save code size, protos without any fields are derived from ZeroFieldsBase
52// rather than Message.
53class PROTOBUF_EXPORT ZeroFieldsBase : public Message {
54 public:
55 PROTOBUF_ATTRIBUTE_REINITIALIZES void Clear() final;
56 bool IsInitialized() const final { return true; }
57 size_t ByteSizeLong() const final;
58 int GetCachedSize() const final { return _cached_size_.Get(); }
59 const char* _InternalParse(const char* ptr,
60 internal::ParseContext* ctx) final;
61 ::uint8_t* _InternalSerialize(::uint8_t* target,
62 io::EpsCopyOutputStream* stream) const final;
63
64 protected:
65 constexpr ZeroFieldsBase() {}
66 explicit ZeroFieldsBase(Arena* arena, bool is_message_owned)
67 : Message(arena, is_message_owned) {}
68 ZeroFieldsBase(const ZeroFieldsBase&) = delete;
69 ZeroFieldsBase& operator=(const ZeroFieldsBase&) = delete;
70 ~ZeroFieldsBase() override;
71
72 void SetCachedSize(int size) const final { _cached_size_.Set(size); }
73
74 static void MergeImpl(Message& to, const Message& from);
75 static void CopyImpl(Message& to, const Message& from);
76 void InternalSwap(ZeroFieldsBase* other);
77
78 mutable internal::CachedSize _cached_size_;
79};
80
81} // namespace internal
82} // namespace protobuf
83} // namespace google
84
85#include <google/protobuf/port_undef.inc>
86
87#endif // GOOGLE_PROTOBUF_GENERATED_MESSAGE_BASES_H__
88