2 //===----------------------------------------------------------------------===//
4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5 // See https://llvm.org/LICENSE.txt for license information.
6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
8 //===----------------------------------------------------------------------===//
10 #ifndef _LIBCPP_IOSFWD
11 #define _LIBCPP_IOSFWD
19 template<class charT> struct char_traits;
20 template<> struct char_traits<char>;
21 template<> struct char_traits<char8_t>; // C++20
22 template<> struct char_traits<char16_t>;
23 template<> struct char_traits<char32_t>;
24 template<> struct char_traits<wchar_t>;
26 template<class T> class allocator;
29 template <class charT, class traits = char_traits<charT> > class basic_ios;
31 template <class charT, class traits = char_traits<charT> > class basic_streambuf;
32 template <class charT, class traits = char_traits<charT> > class basic_istream;
33 template <class charT, class traits = char_traits<charT> > class basic_ostream;
34 template <class charT, class traits = char_traits<charT> > class basic_iostream;
36 template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> >
37 class basic_stringbuf;
38 template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> >
39 class basic_istringstream;
40 template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> >
41 class basic_ostringstream;
42 template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> >
43 class basic_stringstream;
45 template <class charT, class traits = char_traits<charT> > class basic_filebuf;
46 template <class charT, class traits = char_traits<charT> > class basic_ifstream;
47 template <class charT, class traits = char_traits<charT> > class basic_ofstream;
48 template <class charT, class traits = char_traits<charT> > class basic_fstream;
50 template <class charT, class traits = char_traits<charT> > class istreambuf_iterator;
51 template <class charT, class traits = char_traits<charT> > class ostreambuf_iterator;
53 typedef basic_ios<char> ios;
54 typedef basic_ios<wchar_t> wios;
56 typedef basic_streambuf<char> streambuf;
57 typedef basic_istream<char> istream;
58 typedef basic_ostream<char> ostream;
59 typedef basic_iostream<char> iostream;
61 typedef basic_stringbuf<char> stringbuf;
62 typedef basic_istringstream<char> istringstream;
63 typedef basic_ostringstream<char> ostringstream;
64 typedef basic_stringstream<char> stringstream;
66 typedef basic_filebuf<char> filebuf;
67 typedef basic_ifstream<char> ifstream;
68 typedef basic_ofstream<char> ofstream;
69 typedef basic_fstream<char> fstream;
71 typedef basic_streambuf<wchar_t> wstreambuf;
72 typedef basic_istream<wchar_t> wistream;
73 typedef basic_ostream<wchar_t> wostream;
74 typedef basic_iostream<wchar_t> wiostream;
76 typedef basic_stringbuf<wchar_t> wstringbuf;
77 typedef basic_istringstream<wchar_t> wistringstream;
78 typedef basic_ostringstream<wchar_t> wostringstream;
79 typedef basic_stringstream<wchar_t> wstringstream;
81 typedef basic_filebuf<wchar_t> wfilebuf;
82 typedef basic_ifstream<wchar_t> wifstream;
83 typedef basic_ofstream<wchar_t> wofstream;
84 typedef basic_fstream<wchar_t> wfstream;
86 template <class state> class fpos;
87 using streampos = fpos<char_traits<char>::state_type>;
88 using wstreampos = fpos<char_traits<wchar_t>::state_type>;
89 using u8streampos = fpos<char_traits<char8_t>::state_type>; // C++20
90 using u16streampos = fpos<char_traits<char16_t>::state_type>;
91 using u32streampos = fpos<char_traits<char32_t>::state_type>;
93 template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT>>
94 class basic_syncbuf; // C++20
96 using syncbuf = basic_syncbuf<char>; // C++20
97 using wsyncbuf = basic_syncbuf<wchar_t>; // C++20
99 template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT>>
100 class basic_osyncstream; // C++20
102 using osyncstream = basic_osyncstream<char>; // C++20
103 using wosyncstream = basic_osyncstream<wchar_t>; // C++20
109 #include <__assert> // all public C++ headers provide the assertion handler
111 #include <__fwd/fstream.h>
112 #include <__fwd/ios.h>
113 #include <__fwd/istream.h>
114 #include <__fwd/ostream.h>
115 #include <__fwd/sstream.h>
116 #include <__fwd/streambuf.h>
117 #include <__fwd/string.h>
118 #include <__std_mbstate_t.h>
121 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
122 # pragma GCC system_header
125 _LIBCPP_BEGIN_NAMESPACE_STD
127 class _LIBCPP_EXPORTED_FROM_ABI ios_base;
129 template <class _CharT, class _Traits = char_traits<_CharT> >
130 class _LIBCPP_TEMPLATE_VIS istreambuf_iterator;
131 template <class _CharT, class _Traits = char_traits<_CharT> >
132 class _LIBCPP_TEMPLATE_VIS ostreambuf_iterator;
134 template <class _State>
135 class _LIBCPP_TEMPLATE_VIS fpos;
136 typedef fpos<mbstate_t> streampos;
137 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
138 typedef fpos<mbstate_t> wstreampos;
140 #ifndef _LIBCPP_HAS_NO_CHAR8_T
141 typedef fpos<mbstate_t> u8streampos;
143 typedef fpos<mbstate_t> u16streampos;
144 typedef fpos<mbstate_t> u32streampos;
146 #if _LIBCPP_STD_VER >= 20
148 template <class _CharT, class _Traits = char_traits<_CharT>, class _Allocator = allocator<_CharT>>
151 using syncbuf = basic_syncbuf<char>;
152 # ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
153 using wsyncbuf = basic_syncbuf<wchar_t>;
156 template <class _CharT, class _Traits = char_traits<_CharT>, class _Allocator = allocator<_CharT>>
157 class basic_osyncstream;
159 using osyncstream = basic_osyncstream<char>;
160 # ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
161 using wosyncstream = basic_osyncstream<wchar_t>;
164 #endif // _LIBCPP_STD_VER >=20
166 // Include other forward declarations here
167 template <class _Tp, class _Alloc = allocator<_Tp> >
168 class _LIBCPP_TEMPLATE_VIS vector;
170 template <class _CharT, class _Traits>
172 typedef basic_ios<_CharT, _Traits> __stream_type;
173 typedef typename __stream_type::fmtflags fmtflags;
175 __stream_type& __stream_;
176 fmtflags __fmtflags_;
179 __save_flags(const __save_flags&);
180 __save_flags& operator=(const __save_flags&);
183 _LIBCPP_HIDE_FROM_ABI explicit __save_flags(__stream_type& __stream)
184 : __stream_(__stream), __fmtflags_(__stream.flags()), __fill_(__stream.fill()) {}
185 _LIBCPP_HIDE_FROM_ABI ~__save_flags() {
186 __stream_.flags(__fmtflags_);
187 __stream_.fill(__fill_);
191 _LIBCPP_END_NAMESPACE_STD
193 #endif // _LIBCPP_IOSFWD