// 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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// Author: kenton@google.com (Kenton Varda)
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// Based on original Protocol Buffers design by
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// Sanjay Ghemawat, Jeff Dean, and others.
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//
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// This file contains miscellaneous helper code used by generated code --
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// including lite types -- but which should not be used directly by users.
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#ifndef GOOGLE_PROTOBUF_GENERATED_MESSAGE_UTIL_H__
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#define GOOGLE_PROTOBUF_GENERATED_MESSAGE_UTIL_H__
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#include <assert.h>
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#include <string>
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#include <google/protobuf/stubs/common.h>
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#include <google/protobuf/stubs/once.h>
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#include <google/protobuf/has_bits.h>
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#ifndef PROTOBUF_FINAL
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#if LANG_CXX11
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#define PROTOBUF_FINAL final
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#else
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#define PROTOBUF_FINAL
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#endif
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#endif // !PROTOBUF_FINAL
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namespace google {
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namespace protobuf {
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class Arena;
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namespace io { class CodedInputStream; }
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namespace internal {
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// Annotation for the compiler to emit a deprecation message if a field marked
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// with option 'deprecated=true' is used in the code, or for other things in
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// generated code which are deprecated.
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//
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// For internal use in the pb.cc files, deprecation warnings are suppressed
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// there.
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#undef DEPRECATED_PROTOBUF_FIELD
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#define PROTOBUF_DEPRECATED
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#define GOOGLE_PROTOBUF_DEPRECATED_ATTR
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// Constants for special floating point values.
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LIBPROTOBUF_EXPORT double Infinity();
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LIBPROTOBUF_EXPORT double NaN();
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// This type is used to define a global variable, without it's constructor
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// and destructor run on start and end of the program lifetime. This circumvents
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// the initial construction order fiasco, while keeping the address of the
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// empty string a compile time constant.
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template <typename T>
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class ExplicitlyConstructed {
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public:
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void DefaultConstruct() {
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new (&union_) T();
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init_ = true;
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}
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bool IsInitialized() { return init_; }
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void Shutdown() {
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if (init_) {
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init_ = false;
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get_mutable()->~T();
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}
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}
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#if LANG_CXX11
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constexpr
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#endif
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const T&
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get() const {
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return reinterpret_cast<const T&>(union_);
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}
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T* get_mutable() { return reinterpret_cast<T*>(&union_); }
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private:
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// Prefer c++14 aligned_storage, but for compatibility this will do.
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union AlignedUnion {
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char space[sizeof(T)];
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int64 align_to_int64;
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void* align_to_ptr;
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} union_;
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bool init_; // false by linker
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};
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// TODO(jieluo): Change to template. We have tried to use template,
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// but it causes net/rpc/python:rpcutil_test fail (the empty string will
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// init twice). It may related to swig. Change to template after we
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// found the solution.
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// Default empty string object. Don't use this directly. Instead, call
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// GetEmptyString() to get the reference.
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LIBPROTOBUF_EXPORT extern ExplicitlyConstructed< ::std::string> fixed_address_empty_string;
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LIBPROTOBUF_EXPORT extern ProtobufOnceType empty_string_once_init_;
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LIBPROTOBUF_EXPORT void InitEmptyString();
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LIBPROTOBUF_EXPORT inline const ::std::string& GetEmptyStringAlreadyInited() {
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return fixed_address_empty_string.get();
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}
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LIBPROTOBUF_EXPORT inline const ::std::string& GetEmptyString() {
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::google::protobuf::GoogleOnceInit(&empty_string_once_init_, &InitEmptyString);
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return GetEmptyStringAlreadyInited();
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}
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LIBPROTOBUF_EXPORT int StringSpaceUsedExcludingSelf(const string& str);
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// True if IsInitialized() is true for all elements of t. Type is expected
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// to be a RepeatedPtrField<some message type>. It's useful to have this
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// helper here to keep the protobuf compiler from ever having to emit loops in
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// IsInitialized() methods. We want the C++ compiler to inline this or not
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// as it sees fit.
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template <class Type> bool AllAreInitialized(const Type& t) {
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for (int i = t.size(); --i >= 0; ) {
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if (!t.Get(i).IsInitialized()) return false;
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}
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return true;
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}
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LIBPROTOBUF_EXPORT void InitProtobufDefaults();
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// We compute sizes as size_t but cache them as int. This function converts a
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// computed size to a cached size. Since we don't proceed with serialization if
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// the total size was > INT_MAX, it is not important what this function returns
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// for inputs > INT_MAX.
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inline int ToCachedSize(size_t size) {
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return static_cast<int>(size);
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}
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// We mainly calculate sizes in terms of size_t, but some functions that compute
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// sizes return "int". These int sizes are expected to always be positive.
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// This function is more efficient than casting an int to size_t directly on
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// 64-bit platforms because it avoids making the compiler emit a sign extending
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// instruction, which we don't want and don't want to pay for.
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inline size_t FromIntSize(int size) {
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// Convert to unsigned before widening so sign extension is not necessary.
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return static_cast<unsigned int>(size);
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}
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} // namespace internal
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} // namespace protobuf
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} // namespace google
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#endif // GOOGLE_PROTOBUF_GENERATED_MESSAGE_UTIL_H__
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