2002-11-21 Phil Edwards <pme@gcc.gnu.org>

[official-gcc.git] / libstdc++-v3 / include / std / std_sstream.h

// String based streams -*- C++ -*-

// Copyright (C) 1997, 1998, 1999, 2002 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 2, or (at your option)
// any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING.  If not, write to the Free
// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// USA.

// As a special exception, you may use this file as part of a free software
// library without restriction.  Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License.  This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.

//
// ISO C++ 14882: 27.7  String-based streams
//

/** @file sstream
 *  This is a Standard C++ Library header.  You should @c #include this header
 *  in your programs, rather than any of the "st[dl]_*.h" implementation files.
 */

#ifndef _CPP_SSTREAM
#define _CPP_SSTREAM    1

#pragma GCC system_header

#include <istream>
#include <ostream>

namespace std
{
  // [27.7.1] template class basic_stringbuf
  /**
   *  @brief  The actual work of input and output (for std::string).
   *
   *  This class associates either or both of its input and output sequences
   *  with a sequence of characters, which can be initialized from, or made
   *  available as, a @c std::basic_string.  (Paraphrased from [27.7.1]/1.)
   *
   *  For this class, open modes (of type @c ios_base::openmode) have
   *  @c in set if the input sequence can be read, and @c out set if the
   *  output sequence can be written.
  */
  template<typename _CharT, typename _Traits, typename _Alloc>
    class basic_stringbuf : public basic_streambuf<_CharT, _Traits>
    {
    public:
      // Types:
      typedef _CharT                                    char_type;
      typedef _Traits                                   traits_type;
#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
// 251. basic_stringbuf missing allocator_type
      typedef _Alloc                                    allocator_type;
#endif
      typedef typename traits_type::int_type            int_type;
      typedef typename traits_type::pos_type            pos_type;
      typedef typename traits_type::off_type            off_type;

      //@{
      /**
       *  @if maint
       *  @doctodo
       *  @endif
      */
      typedef basic_streambuf<char_type, traits_type>   __streambuf_type;
      typedef basic_string<char_type, _Traits, _Alloc>  __string_type;
      typedef typename __string_type::size_type         __size_type;
      //@}

    protected:
      // Data Members:
      /**
       *  @if maint
       *  @doctodo
       *  @endif
      */
      __string_type             _M_string;

    public:
      // Constructors:
      /**
       *  @brief  Starts with an empty string buffer.
       *  @param  mode  Whether the buffer can read, or write, or both.
       *
       *  The default constructor initializes the parent class using its
       *  own default ctor.
      */
      explicit
      basic_stringbuf(ios_base::openmode __mode = ios_base::in | ios_base::out)
      : __streambuf_type(), _M_string()
      { _M_stringbuf_init(__mode); }

      /**
       *  @brief  Starts with an existing string buffer.
       *  @param  str  A string to copy as a starting buffer.
       *  @param  mode  Whether the buffer can read, or write, or both.
       *
       *  This constructor initializes the parent class using its
       *  own default ctor.
      */
      explicit
      basic_stringbuf(const __string_type& __str,
                      ios_base::openmode __mode = ios_base::in | ios_base::out)
      : __streambuf_type(), _M_string(__str.data(), __str.size())
      { _M_stringbuf_init(__mode); }

      // Get and set:
      /**
       *  @brief  Copying out the string buffer.
       *  @return  A copy of one of the underlying sequences.
       *
       *  "If the buffer is only created in input mode, the underlying
       *  character sequence is equal to the input sequence; otherwise, it
       *  is equal to the output sequence." [27.7.1.2]/1
      */
      __string_type
      str() const
      {
        if (_M_mode & ios_base::out)
          {
            // This is the deal: _M_string.size() is a value that
            // represents the size of the initial string that makes
            // _M_string, and may not be the correct size of the
            // current stringbuf internal buffer.
            __size_type __len = _M_string.size();
            if (_M_out_cur > _M_out_beg)
              __len = max(__size_type(_M_out_end - _M_out_beg), __len);
            return __string_type(_M_out_beg, _M_out_beg + __len);
          }
        else
          return _M_string;
      }

      /**
       *  @brief  Setting a new buffer.
       *  @param  s  The string to use as a new sequence.
       *
       *  Deallocates any previous stored sequence, then copies @a s to
       *  use as a new one.
      */
      void
      str(const __string_type& __s)
      {
        // Cannot use _M_string = __s, since v3 strings are COW.
        _M_string.assign(__s.data(), __s.size());
        _M_stringbuf_init(_M_mode);
      }

    protected:
      // Common initialization code for both ctors goes here.
      /**
       *  @if maint
       *  @doctodo
       *  @endif
      */
      void
      _M_stringbuf_init(ios_base::openmode __mode)
      {
        // _M_buf_size is a convenient alias for "what the streambuf
        // thinks the allocated size of the string really is." This is
        // necessary as ostringstreams are implemented with the
        // streambufs having control of the allocation and
        // re-allocation of the internal string object, _M_string.
        _M_buf_size = _M_string.size();

        // NB: Start ostringstream buffers at 512 bytes. This is an
        // experimental value (pronounced "arbitrary" in some of the
        // hipper english-speaking countries), and can be changed to
        // suit particular needs.
        _M_buf_size_opt = 512;
        _M_mode = __mode;
        if (_M_mode & (ios_base::ate | ios_base::app))
          _M_really_sync(0, _M_buf_size);
        else
          _M_really_sync(0, 0);
      }

      // Overridden virtual functions:
      // [documentation is inherited]
      virtual int_type
      underflow()
      {
        if (_M_in_cur && _M_in_cur < _M_in_end)
          return traits_type::to_int_type(*gptr());
        else
          return traits_type::eof();
      }

      // [documentation is inherited]
      virtual int_type
      pbackfail(int_type __c = traits_type::eof());

      // [documentation is inherited]
      virtual int_type
      overflow(int_type __c = traits_type::eof());

      /**
       *  @brief  Manipulates the buffer.
       *  @param  s  Pointer to a buffer area.
       *  @param  n  Size of @a s.
       *  @return  @c this
       *
       *  If no buffer has already been created, and both @a s and @a n are
       *  non-zero, then @c s is used as a buffer; see
       *  http://gcc.gnu.org/onlinedocs/libstdc++/27_io/howto.html#2
       *  for more.
      */
      virtual __streambuf_type*
      setbuf(char_type* __s, streamsize __n)
      {
        if (__s && __n)
          {
            _M_string = __string_type(__s, __n);
            _M_really_sync(0, 0);
          }
        return this;
      }

      // [documentation is inherited]
      virtual pos_type
      seekoff(off_type __off, ios_base::seekdir __way,
              ios_base::openmode __mode = ios_base::in | ios_base::out);

      // [documentation is inherited]
      virtual pos_type
      seekpos(pos_type __sp,
              ios_base::openmode __mode = ios_base::in | ios_base::out);

      // Internal function for correctly updating the internal buffer
      // for a particular _M_string, due to initialization or
      // re-sizing of an existing _M_string.
      // Assumes: contents of _M_string and internal buffer match exactly.
      // __i == _M_in_cur - _M_in_beg
      // __o == _M_out_cur - _M_out_beg
      /**
       *  @if maint
       *  @doctodo
       *  @endif
      */
      virtual int
      _M_really_sync(__size_type __i, __size_type __o)
      {
        char_type* __base = const_cast<char_type*>(_M_string.data());
        bool __testin = _M_mode & ios_base::in;
        bool __testout = _M_mode & ios_base::out;
        __size_type __len = _M_string.size();

        _M_buf = __base;
        if (__testin)
            this->setg(__base, __base + __i, __base + __len);
        if (__testout)
          {
            this->setp(__base, __base + __len);
            _M_out_cur += __o;
          }
        return 0;
      }
    };


  // [27.7.2] Template class basic_istringstream
  /**
   *  @brief  Controlling input for std::string.
   *
   *  This class supports reading from objects of type std::basic_string,
   *  using the inherited functions from std::basic_istream.  To control
   *  the associated sequence, an instance of std::basic_stringbuf is used,
   *  which this page refers to as @c sb.
  */
  template<typename _CharT, typename _Traits, typename _Alloc>
    class basic_istringstream : public basic_istream<_CharT, _Traits>
    {
    public:
      // Types:
      typedef _CharT                                    char_type;
      typedef _Traits                                   traits_type;
#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
// 251. basic_stringbuf missing allocator_type
      typedef _Alloc                                    allocator_type;
#endif
      typedef typename traits_type::int_type            int_type;
      typedef typename traits_type::pos_type            pos_type;
      typedef typename traits_type::off_type            off_type;

      // Non-standard types:
      typedef basic_string<_CharT, _Traits, _Alloc>     __string_type;
      typedef basic_stringbuf<_CharT, _Traits, _Alloc>  __stringbuf_type;
      typedef basic_istream<char_type, traits_type>     __istream_type;

    private:
      /**
       *  @if maint
       *  @doctodo
       *  @endif
      */
      __stringbuf_type  _M_stringbuf;

    public:
      // Constructors:
      /**
       *  @brief  Default constructor starts with an empty string buffer.
       *  @param  mode  Whether the buffer can read, or write, or both.
       *
       *  @c ios_base::in is automatically included in @a mode.
       *
       *  Initializes @c sb using @c mode|in, and passes @c &sb to the base
       *  class initializer.  Does not allocate any buffer.
       *
       *  @if maint
       *  That's a lie.  We initialize the base class with NULL, because the
       *  string class does its own memory management.
       *  @endif
      */
      explicit
      basic_istringstream(ios_base::openmode __mode = ios_base::in)
      : __istream_type(NULL), _M_stringbuf(__mode | ios_base::in)
      { this->init(&_M_stringbuf); }

      /**
       *  @brief  Starts with an existing string buffer.
       *  @param  str  A string to copy as a starting buffer.
       *  @param  mode  Whether the buffer can read, or write, or both.
       *
       *  @c ios_base::in is automatically included in @a mode.
       *
       *  Initializes @c sb using @a str and @c mode|in, and passes @c &sb
       *  to the base class initializer.
       *
       *  @if maint
       *  That's a lie.  We initialize the base class with NULL, because the
       *  string class does its own memory management.
       *  @endif
      */
      explicit
      basic_istringstream(const __string_type& __str,
                          ios_base::openmode __mode = ios_base::in)
      : __istream_type(NULL), _M_stringbuf(__str, __mode | ios_base::in)
      { this->init(&_M_stringbuf); }

      /**
       *  @brief  The destructor does nothing.
       *
       *  The buffer is deallocated by the stringbuf object, not the
       *  formatting stream.
      */
      ~basic_istringstream()
      { }

      // Members:
      /**
       *  @brief  Accessing the underlying buffer.
       *  @return  The current basic_stringbuf buffer.
       *
       *  This hides both signatures of std::basic_ios::rdbuf().
      */
      __stringbuf_type*
      rdbuf() const
      { return const_cast<__stringbuf_type*>(&_M_stringbuf); }

      /**
       *  @brief  Copying out the string buffer.
       *  @return  @c rdbuf()->str()
      */
      __string_type
      str() const
      { return _M_stringbuf.str(); }

      /**
       *  @brief  Setting a new buffer.
       *  @param  s  The string to use as a new sequence.
       *
       *  Calls @c rdbuf()->str(s).
      */
      void
      str(const __string_type& __s)
      { _M_stringbuf.str(__s); }
    };


  // [27.7.3] Template class basic_ostringstream
  /**
   *  @brief  Controlling output for std::string.
   *
   *  This class supports writing to objects of type std::basic_string,
   *  using the inherited functions from std::basic_ostream.  To control
   *  the associated sequence, an instance of std::basic_stringbuf is used,
   *  which this page refers to as @c sb.
  */
  template <typename _CharT, typename _Traits, typename _Alloc>
    class basic_ostringstream : public basic_ostream<_CharT, _Traits>
    {
    public:
      // Types:
      typedef _CharT                                    char_type;
      typedef _Traits                                   traits_type;
#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
// 251. basic_stringbuf missing allocator_type
      typedef _Alloc                                    allocator_type;
#endif
      typedef typename traits_type::int_type            int_type;
      typedef typename traits_type::pos_type            pos_type;
      typedef typename traits_type::off_type            off_type;

      // Non-standard types:
      typedef basic_string<_CharT, _Traits, _Alloc>     __string_type;
      typedef basic_stringbuf<_CharT, _Traits, _Alloc>  __stringbuf_type;
      typedef basic_ostream<char_type, traits_type>     __ostream_type;

    private:
      /**
       *  @if maint
       *  @doctodo
       *  @endif
      */
      __stringbuf_type  _M_stringbuf;

    public:
      // Constructors/destructor:
      /**
       *  @brief  Default constructor starts with an empty string buffer.
       *  @param  mode  Whether the buffer can read, or write, or both.
       *
       *  @c ios_base::out is automatically included in @a mode.
       *
       *  Initializes @c sb using @c mode|out, and passes @c &sb to the base
       *  class initializer.  Does not allocate any buffer.
       *
       *  @if maint
       *  That's a lie.  We initialize the base class with NULL, because the
       *  string class does its own memory management.
       *  @endif
      */
      explicit
      basic_ostringstream(ios_base::openmode __mode = ios_base::out)
      : __ostream_type(NULL), _M_stringbuf(__mode | ios_base::out)
      { this->init(&_M_stringbuf); }

      /**
       *  @brief  Starts with an existing string buffer.
       *  @param  str  A string to copy as a starting buffer.
       *  @param  mode  Whether the buffer can read, or write, or both.
       *
       *  @c ios_base::out is automatically included in @a mode.
       *
       *  Initializes @c sb using @a str and @c mode|out, and passes @c &sb
       *  to the base class initializer.
       *
       *  @if maint
       *  That's a lie.  We initialize the base class with NULL, because the
       *  string class does its own memory management.
       *  @endif
      */
      explicit
      basic_ostringstream(const __string_type& __str,
                          ios_base::openmode __mode = ios_base::out)
      : __ostream_type(NULL), _M_stringbuf(__str, __mode | ios_base::out)
      { this->init(&_M_stringbuf); }

      /**
       *  @brief  The destructor does nothing.
       *
       *  The buffer is deallocated by the stringbuf object, not the
       *  formatting stream.
      */
      ~basic_ostringstream()
      { }

      // Members:
      /**
       *  @brief  Accessing the underlying buffer.
       *  @return  The current basic_stringbuf buffer.
       *
       *  This hides both signatures of std::basic_ios::rdbuf().
      */
      __stringbuf_type*
      rdbuf() const
      { return const_cast<__stringbuf_type*>(&_M_stringbuf); }

      /**
       *  @brief  Copying out the string buffer.
       *  @return  @c rdbuf()->str()
      */
      __string_type
      str() const
      { return _M_stringbuf.str(); }

      /**
       *  @brief  Setting a new buffer.
       *  @param  s  The string to use as a new sequence.
       *
       *  Calls @c rdbuf()->str(s).
      */
      void
      str(const __string_type& __s)
      { _M_stringbuf.str(__s); }
    };


  // [27.7.4] Template class basic_stringstream
  /**
   *  @brief  Controlling input and output for std::string.
   *
   *  This class supports reading from and writing to objects of type
   *  std::basic_string, using the inherited functions from
   *  std::basic_iostream.  To control the associated sequence, an instance
   *  of std::basic_stringbuf is used, which this page refers to as @c sb.
  */
  template <typename _CharT, typename _Traits, typename _Alloc>
    class basic_stringstream : public basic_iostream<_CharT, _Traits>
    {
    public:
      // Types:
      typedef _CharT                                    char_type;
      typedef _Traits                                   traits_type;
#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
// 251. basic_stringbuf missing allocator_type
      typedef _Alloc                                    allocator_type;
#endif
      typedef typename traits_type::int_type            int_type;
      typedef typename traits_type::pos_type            pos_type;
      typedef typename traits_type::off_type            off_type;

      // Non-standard Types:
      typedef basic_string<_CharT, _Traits, _Alloc>     __string_type;
      typedef basic_stringbuf<_CharT, _Traits, _Alloc>  __stringbuf_type;
      typedef basic_iostream<char_type, traits_type>    __iostream_type;

    private:
      /**
       *  @if maint
       *  @doctodo
       *  @endif
      */
      __stringbuf_type  _M_stringbuf;

    public:
      // Constructors/destructors
      /**
       *  @brief  Default constructor starts with an empty string buffer.
       *  @param  mode  Whether the buffer can read, or write, or both.
       *
       *  Initializes @c sb using @c mode, and passes @c &sb to the base
       *  class initializer.  Does not allocate any buffer.
       *
       *  @if maint
       *  That's a lie.  We initialize the base class with NULL, because the
       *  string class does its own memory management.
       *  @endif
      */
      explicit
      basic_stringstream(ios_base::openmode __m = ios_base::out | ios_base::in)
      : __iostream_type(NULL), _M_stringbuf(__m)
      { this->init(&_M_stringbuf); }

      /**
       *  @brief  Starts with an existing string buffer.
       *  @param  str  A string to copy as a starting buffer.
       *  @param  mode  Whether the buffer can read, or write, or both.
       *
       *  Initializes @c sb using @a str and @c mode, and passes @c &sb
       *  to the base class initializer.
       *
       *  @if maint
       *  That's a lie.  We initialize the base class with NULL, because the
       *  string class does its own memory management.
       *  @endif
      */
      explicit
      basic_stringstream(const __string_type& __str,
                         ios_base::openmode __m = ios_base::out | ios_base::in)
      : __iostream_type(NULL), _M_stringbuf(__str, __m)
      { this->init(&_M_stringbuf); }

      /**
       *  @brief  The destructor does nothing.
       *
       *  The buffer is deallocated by the stringbuf object, not the
       *  formatting stream.
      */
      ~basic_stringstream()
      { }

      // Members:
      /**
       *  @brief  Accessing the underlying buffer.
       *  @return  The current basic_stringbuf buffer.
       *
       *  This hides both signatures of std::basic_ios::rdbuf().
      */
      __stringbuf_type*
      rdbuf() const
      { return const_cast<__stringbuf_type*>(&_M_stringbuf); }

      /**
       *  @brief  Copying out the string buffer.
       *  @return  @c rdbuf()->str()
      */
      __string_type
      str() const
      { return _M_stringbuf.str(); }

      /**
       *  @brief  Setting a new buffer.
       *  @param  s  The string to use as a new sequence.
       *
       *  Calls @c rdbuf()->str(s).
      */
      void
      str(const __string_type& __s)
      { _M_stringbuf.str(__s); }
    };
} // namespace std

#ifdef _GLIBCPP_NO_TEMPLATE_EXPORT
# define export
#endif
#ifdef  _GLIBCPP_FULLY_COMPLIANT_HEADERS
# include <bits/sstream.tcc>
#endif

#endif