// 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
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// Author: kenton@google.com (Kenton Varda)
//  Based on original Protocol Buffers design by
//  Sanjay Ghemawat, Jeff Dean, and others.
//
// This file exists solely to document the google::protobuf namespace.
// It is not compiled into anything, but it may be read by an automated
// documentation generator.

namespace google {

// Core components of the Protocol Buffers runtime library.
//
// The files in this package represent the core of the Protocol Buffer
// system.  All of them are part of the libprotobuf library.
//
// A note on thread-safety:
//
// Thread-safety in the Protocol Buffer library follows a simple rule:
// unless explicitly noted otherwise, it is always safe to use an object
// from multiple threads simultaneously as long as the object is declared
// const in all threads (or, it is only used in ways that would be allowed
// if it were declared const).  However, if an object is accessed in one
// thread in a way that would not be allowed if it were const, then it is
// not safe to access that object in any other thread simultaneously.
//
// Put simply, read-only access to an object can happen in multiple threads
// simultaneously, but write access can only happen in a single thread at
// a time.
//
// The implementation does contain some "const" methods which actually modify
// the object behind the scenes -- e.g., to cache results -- but in these cases
// mutex locking is used to make the access thread-safe.
namespace protobuf {}
}  // namespace google