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 // from google3/util/gtl/stl_util.h
32
33 #ifndef GOOGLE_PROTOBUF_STUBS_STL_UTIL_H__
34 #define GOOGLE_PROTOBUF_STUBS_STL_UTIL_H__
35
36 #include <google/protobuf/stubs/common.h>
37
38 namespace google {
39 namespace protobuf {
40
41 // Inside Google, this function implements a horrible, disgusting hack in which
42 // we reach into the string's private implementation and resize it without
43 // initializing the new bytes. In some cases doing this can significantly
44 // improve performance. However, since it's totally non-portable it has no
45 // place in open source code. Feel free to fill this function in with your
46 // own disgusting hack if you want the perf boost.
STLStringResizeUninitialized(string * s,size_t new_size)47 inline void STLStringResizeUninitialized(string* s, size_t new_size) {
48 s->resize(new_size);
49 }
50
51 // Return a mutable char* pointing to a string's internal buffer,
52 // which may not be null-terminated. Writing through this pointer will
53 // modify the string.
54 //
55 // string_as_array(&str)[i] is valid for 0 <= i < str.size() until the
56 // next call to a string method that invalidates iterators.
57 //
58 // As of 2006-04, there is no standard-blessed way of getting a
59 // mutable reference to a string's internal buffer. However, issue 530
60 // (http://www.open-std.org/JTC1/SC22/WG21/docs/lwg-active.html#530)
61 // proposes this as the method. According to Matt Austern, this should
62 // already work on all current implementations.
string_as_array(string * str)63 inline char* string_as_array(string* str) {
64 // DO NOT USE const_cast<char*>(str->data())! See the unittest for why.
65 return str->empty() ? nullptr : &*str->begin();
66 }
67
68 } // namespace protobuf
69 } // namespace google
70
71 #endif // GOOGLE_PROTOBUF_STUBS_STL_UTIL_H__
72