libstdc++
strstream
Go to the documentation of this file.
1 // Backward-compat support -*- C++ -*-
2 
3 // Copyright (C) 2001-2015 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 /*
26  * Copyright (c) 1998
27  * Silicon Graphics Computer Systems, Inc.
28  *
29  * Permission to use, copy, modify, distribute and sell this software
30  * and its documentation for any purpose is hereby granted without fee,
31  * provided that the above copyright notice appear in all copies and
32  * that both that copyright notice and this permission notice appear
33  * in supporting documentation. Silicon Graphics makes no
34  * representations about the suitability of this software for any
35  * purpose. It is provided "as is" without express or implied warranty.
36  */
37 
38 // WARNING: The classes defined in this header are DEPRECATED. This
39 // header is defined in section D.7.1 of the C++ standard, and it
40 // MAY BE REMOVED in a future standard revision. One should use the
41 // header <sstream> instead.
42 
43 /** @file strstream
44  * This is a Standard C++ Library header.
45  */
46 
47 #ifndef _BACKWARD_STRSTREAM
48 #define _BACKWARD_STRSTREAM
49 
50 #include "backward_warning.h"
51 #include <iosfwd>
52 #include <ios>
53 #include <istream>
54 #include <ostream>
55 #include <string>
56 
57 namespace std _GLIBCXX_VISIBILITY(default)
58 {
59 _GLIBCXX_BEGIN_NAMESPACE_VERSION
60 
61  // Class strstreambuf, a streambuf class that manages an array of char.
62  // Note that this class is not a template.
63  class strstreambuf : public basic_streambuf<char, char_traits<char> >
64  {
65  public:
66  // Types.
67  typedef char_traits<char> _Traits;
68  typedef basic_streambuf<char, _Traits> _Base;
69 
70  public:
71  // Constructor, destructor
72  explicit strstreambuf(streamsize __initial_capacity = 0);
73  strstreambuf(void* (*__alloc)(size_t), void (*__free)(void*));
74 
75  strstreambuf(char* __get, streamsize __n, char* __put = 0) throw ();
76  strstreambuf(signed char* __get, streamsize __n, signed char* __put = 0) throw ();
77  strstreambuf(unsigned char* __get, streamsize __n, unsigned char* __put=0) throw ();
78 
79  strstreambuf(const char* __get, streamsize __n) throw ();
80  strstreambuf(const signed char* __get, streamsize __n) throw ();
81  strstreambuf(const unsigned char* __get, streamsize __n) throw ();
82 
83  virtual ~strstreambuf();
84 
85  public:
86  void freeze(bool = true) throw ();
87  char* str() throw ();
88  _GLIBCXX_PURE int pcount() const throw ();
89 
90  protected:
91  virtual int_type overflow(int_type __c = _Traits::eof());
92  virtual int_type pbackfail(int_type __c = _Traits::eof());
93  virtual int_type underflow();
94  virtual _Base* setbuf(char* __buf, streamsize __n);
95  virtual pos_type seekoff(off_type __off, ios_base::seekdir __dir,
96  ios_base::openmode __mode
97  = ios_base::in | ios_base::out);
98  virtual pos_type seekpos(pos_type __pos, ios_base::openmode __mode
99  = ios_base::in | ios_base::out);
100 
101  private:
102  strstreambuf&
103  operator=(const strstreambuf&);
104 
105  strstreambuf(const strstreambuf&);
106 
107  // Dynamic allocation, possibly using _M_alloc_fun and _M_free_fun.
108  char* _M_alloc(size_t);
109  void _M_free(char*);
110 
111  // Helper function used in constructors.
112  void _M_setup(char* __get, char* __put, streamsize __n) throw ();
113 
114  private:
115  // Data members.
116  void* (*_M_alloc_fun)(size_t);
117  void (*_M_free_fun)(void*);
118 
119  bool _M_dynamic : 1;
120  bool _M_frozen : 1;
121  bool _M_constant : 1;
122  };
123 
124  // Class istrstream, an istream that manages a strstreambuf.
125  class istrstream : public basic_istream<char>
126  {
127  public:
128  explicit istrstream(char*);
129  explicit istrstream(const char*);
130  istrstream(char* , streamsize);
131  istrstream(const char*, streamsize);
132  virtual ~istrstream();
133 
134  _GLIBCXX_CONST strstreambuf* rdbuf() const throw ();
135  char* str() throw ();
136 
137  private:
138  strstreambuf _M_buf;
139  };
140 
141  // Class ostrstream
142  class ostrstream : public basic_ostream<char>
143  {
144  public:
145  ostrstream();
146  ostrstream(char*, int, ios_base::openmode = ios_base::out);
147  virtual ~ostrstream();
148 
149  _GLIBCXX_CONST strstreambuf* rdbuf() const throw ();
150  void freeze(bool = true) throw();
151  char* str() throw ();
152  _GLIBCXX_PURE int pcount() const throw ();
153 
154  private:
155  strstreambuf _M_buf;
156  };
157 
158  // Class strstream
159  class strstream : public basic_iostream<char>
160  {
161  public:
162  typedef char char_type;
163  typedef char_traits<char>::int_type int_type;
164  typedef char_traits<char>::pos_type pos_type;
165  typedef char_traits<char>::off_type off_type;
166 
167  strstream();
168  strstream(char*, int, ios_base::openmode = ios_base::in | ios_base::out);
169  virtual ~strstream();
170 
171  _GLIBCXX_CONST strstreambuf* rdbuf() const throw ();
172  void freeze(bool = true) throw ();
173  _GLIBCXX_PURE int pcount() const throw ();
174  char* str() throw ();
175 
176  private:
177  strstreambuf _M_buf;
178  };
179 
180 _GLIBCXX_END_NAMESPACE_VERSION
181 } // namespace
182 
183 #endif