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// Author: kenton@google.com (Kenton Varda)
32//  Based on original Protocol Buffers design by
33//  Sanjay Ghemawat, Jeff Dean, and others.
34
35#include <google/protobuf/generated_message_util.h>
36
37#include <limits>
38
39
40namespace google {
41namespace protobuf {
42namespace internal {
43
44double Infinity() {
45  return std::numeric_limits<double>::infinity();
46}
47double NaN() {
48  return std::numeric_limits<double>::quiet_NaN();
49}
50
51const ::std::string* empty_string_;
52GOOGLE_PROTOBUF_DECLARE_ONCE(empty_string_once_init_);
53
54void DeleteEmptyString() {
55  delete empty_string_;
56}
57
58void InitEmptyString() {
59  empty_string_ = new string;
60  OnShutdown(&DeleteEmptyString);
61}
62
63int StringSpaceUsedExcludingSelf(const string& str) {
64  const void* start = &str;
65  const void* end = &str + 1;
66  if (start <= str.data() && str.data() < end) {
67    // The string's data is stored inside the string object itself.
68    return 0;
69  } else {
70    return str.capacity();
71  }
72}
73
74
75
76}  // namespace internal
77}  // namespace protobuf
78}  // namespace google
79