1// <string> Forward declarations -*- C++ -*- 
2 
3// Copyright (C) 2001-2019 Free Software Foundation, Inc. 
4// 
5// This file is part of the GNU ISO C++ Library. This library is free 
6// software; you can redistribute it and/or modify it under the 
7// terms of the GNU General Public License as published by the 
8// Free Software Foundation; either version 3, or (at your option) 
9// any later version. 
10 
11// This library is distributed in the hope that it will be useful, 
12// but WITHOUT ANY WARRANTY; without even the implied warranty of 
13// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 
14// GNU General Public License for more details. 
15 
16// Under Section 7 of GPL version 3, you are granted additional 
17// permissions described in the GCC Runtime Library Exception, version 
18// 3.1, as published by the Free Software Foundation. 
19 
20// You should have received a copy of the GNU General Public License and 
21// a copy of the GCC Runtime Library Exception along with this program; 
22// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 
23// <http://www.gnu.org/licenses/>. 
24 
25/** @file bits/stringfwd.h 
26 * This is an internal header file, included by other library headers. 
27 * Do not attempt to use it directly. @headername{string} 
28 */ 
29 
30// 
31// ISO C++ 14882: 21 Strings library 
32// 
33 
34#ifndef _STRINGFWD_H 
35#define _STRINGFWD_H 1 
36 
37#pragma GCC system_header 
38 
39#include <bits/c++config.h> 
40#include <bits/memoryfwd.h> 
41 
42namespace std _GLIBCXX_VISIBILITY(default) 
43{ 
44_GLIBCXX_BEGIN_NAMESPACE_VERSION 
45 
46 /** 
47 * @defgroup strings Strings 
48 * 
49 * @{ 
50 */ 
51 
52 template<class _CharT> 
53 struct char_traits; 
54 
55 template<> struct char_traits<char>; 
56 
57#ifdef _GLIBCXX_USE_WCHAR_T 
58 template<> struct char_traits<wchar_t>; 
59#endif 
60 
61#ifdef _GLIBCXX_USE_CHAR8_T 
62 template<> struct char_traits<char8_t>; 
63#endif 
64 
65#if __cplusplus >= 201103L 
66 template<> struct char_traits<char16_t>; 
67 template<> struct char_traits<char32_t>; 
68#endif 
69 
70_GLIBCXX_BEGIN_NAMESPACE_CXX11 
71 
72 template<typename _CharT, typename _Traits = char_traits<_CharT>, 
73 typename _Alloc = allocator<_CharT> > 
74 class basic_string; 
75 
76_GLIBCXX_END_NAMESPACE_CXX11 
77 
78 /// A string of @c char 
79 typedef basic_string<char> string;  
80 
81#ifdef _GLIBCXX_USE_WCHAR_T 
82 /// A string of @c wchar_t 
83 typedef basic_string<wchar_t> wstring;  
84#endif 
85 
86#ifdef _GLIBCXX_USE_CHAR8_T 
87 /// A string of @c char8_t 
88 typedef basic_string<char8_t> u8string; 
89#endif 
90 
91#if __cplusplus >= 201103L 
92 /// A string of @c char16_t 
93 typedef basic_string<char16_t> u16string;  
94 
95 /// A string of @c char32_t 
96 typedef basic_string<char32_t> u32string;  
97#endif 
98 
99 /** @} */ 
100 
101_GLIBCXX_END_NAMESPACE_VERSION 
102} // namespace std 
103 
104#endif // _STRINGFWD_H 
105