_istream.h

/*
 * Copyright (c) 1999
 * Silicon Graphics Computer Systems, Inc.
 *
 * Copyright (c) 1999 
 * Boris Fomitchev
 *
 * This material is provided "as is", with absolutely no warranty expressed
 * or implied. Any use is at your own risk.
 *
 * Permission to use or copy this software for any purpose is hereby granted 
 * without fee, provided the above notices are retained on all copies.
 * Permission to modify the code and to distribute modified code is granted,
 * provided the above notices are retained, and a notice that the code was
 * modified is included with the above copyright notice.
 *
 */ 
#ifndef _STLP_INTERNAL_ISTREAM_H
#define _STLP_INTERNAL_ISTREAM_H

// this block is included by _ostream.h, we include it here to lower #include level
# if defined (_STLP_HAS_WCHAR_T) && !defined (_STLP_CWCHAR)
#  include <cwchar>
# endif

# ifndef _STLP_INTERNAL_IOS_H
#  include <stl/_ios.h>                  // For basic_ios<>.  Includes <iosfwd>.
# endif

#ifndef _STLP_INTERNAL_OSTREAM_H
# include <stl/_ostream.h>              // Needed as a base class of basic_iostream.
#endif

#ifndef _STLP_INTERNAL_ISTREAMBUF_ITERATOR_H
# include <stl/_istreambuf_iterator.h>
#endif

#include <stl/_ctraits_fns.h>    // Helper functions that allow char traits
                                // to be used as function objects.
_STLP_BEGIN_NAMESPACE

template <class _CharT, class _Traits, class _Number> 
ios_base::iostate _STLP_CALL
_M_get_num(basic_istream<_CharT, _Traits>& __that, _Number& __val);

#if defined (_STLP_USE_TEMPLATE_EXPORT)
template <class _CharT, class _Traits>
class _Isentry;
#endif

struct _No_Skip_WS {};        // Dummy class used by sentry.

template <class _CharT, class _Traits>
bool _M_init_skip(basic_istream<_CharT, _Traits>& __is);
template <class _CharT, class _Traits>
bool _M_init_noskip(basic_istream<_CharT, _Traits>& __is);

//----------------------------------------------------------------------
// Class basic_istream, a class that performs formatted input through
// a stream buffer.

// The second template parameter, _Traits, defaults to char_traits<_CharT>.
// The default is declared in header <iosfwd>, and it isn't declared here
// because C++ language rules do not allow it to be declared twice. 

template <class _CharT, class _Traits>
class basic_istream : virtual public basic_ios<_CharT, _Traits> {
public:
                         // Types
  typedef _CharT                     char_type;
  typedef typename _Traits::int_type int_type;
  typedef typename _Traits::pos_type pos_type;
  typedef typename _Traits::off_type off_type;
  typedef _Traits                    traits_type;
  typedef basic_ios<_CharT, _Traits>     _Basic_ios;
  typedef basic_istream<_CharT, _Traits> _Self;

  typedef basic_ios<_CharT, _Traits>& (_STLP_CALL *__ios_fn)(basic_ios<_CharT, _Traits>&);
  typedef ios_base& (_STLP_CALL *__ios_base_fn)(ios_base&);
  typedef _Self& (_STLP_CALL *__istream_fn)(_Self&);

public:                         // Constructor and destructor.
  explicit basic_istream(basic_streambuf<_CharT, _Traits>* __buf) :
    basic_ios<_CharT, _Traits>(), _M_gcount(0) {
    this->init(__buf);
  }
  ~basic_istream() {};

public:                         // Nested sentry class.

public:                         // Hooks for manipulators.  The arguments are
                                // function pointers.
  _Self& operator>> (__istream_fn __f) { return __f(*this); }
  _Self& operator>> (__ios_fn __f) {  __f(*this); return *this; }
  _Self& operator>> (__ios_base_fn __f) { __f(*this); return *this; }

public:                         // Formatted input of numbers.
  _Self& operator>> (short& __val) {
    long __lval;
    unsigned short __uval;
   _M_get_num(*this, __lval);
    __val = __STATIC_CAST(short, __lval);
    __uval = __lval;
    // check if we lose digits
    //    if ((__val != __lval) && ((unsigned short)__val != __lval))
    if ((__val != __lval) && ((long)__uval != __lval))
      this->setstate(ios_base::failbit); 
    return *this; 
  }
  _Self& operator>> (int& __val) { 
    long __lval;
    unsigned int __uval;
    _M_get_num(*this, __lval);
    __val = __lval;
    __uval = __lval;
    // check if we lose digits
    //    if ((__val != __lval) && ((unsigned int)__val != __lval))
    if ((__val != __lval) && ((long)__uval != __lval))
      this->setstate(ios_base::failbit); 
    return *this;
  }
  _Self& operator>> (unsigned short& __val) { _M_get_num(*this, __val); return *this; }
  _Self& operator>> (unsigned int& __val) { _M_get_num(*this, __val); return *this; }
  _Self& operator>> (long& __val) { _M_get_num(*this, __val); return *this; }
  _Self& operator>> (unsigned long& __val) { _M_get_num(*this, __val); return *this; }
#ifdef _STLP_LONG_LONG
  _Self& operator>> (_STLP_LONG_LONG& __val) { _M_get_num(*this, __val); return *this; }
  _Self& operator>> (unsigned _STLP_LONG_LONG& __val) { _M_get_num(*this, __val); return *this; }
#endif 
  _Self& operator>> (float& __val)  { _M_get_num(*this, __val); return *this; }
  _Self& operator>> (double& __val) { _M_get_num(*this, __val); return *this; }
# ifndef _STLP_NO_LONG_DOUBLE
  _Self& operator>> (long double& __val) { _M_get_num(*this, __val); return *this; }
# endif
# ifndef _STLP_NO_BOOL
  _Self& operator>> (bool& __val) { _M_get_num(*this, __val); return *this; }
# endif
  _Self& operator>> (void*& __val) { _M_get_num(*this, __val); return *this; }

public:                         // Copying characters into a streambuf.
  _Self& operator>>(basic_streambuf<_CharT, _Traits>*);

public:                         // Unformatted input.
  streamsize gcount() const { return _M_gcount; }
  int_type peek();

public:                         // get() for single characters
  int_type get();
  _Self& get(char_type& __c);

public:                         // get() for character arrays.
  _Self& get(char_type* __s, streamsize __n, char_type __delim);
  _Self& get(char_type* __s, streamsize __n)
    { return get(__s, __n, this->widen('\n')); }

public:                         // get() for streambufs
  _Self& get(basic_streambuf<_CharT, _Traits>& __buf,
                     char_type __delim);
  _Self& get(basic_streambuf<_CharT, _Traits>& __buf)
    { return get(__buf, this->widen('\n')); }

public:                         // getline()
  _Self& getline(char_type* __s, streamsize __n, char_type delim);
  _Self& getline(char_type* __s, streamsize __n)
    { return getline(__s, __n, this->widen('\n')); }

public:                         // read(), readsome(), ignore()
  _Self& ignore();
  _Self& ignore(streamsize __n);
#if (defined (_STLP_MSVC) && _STLP_MSVC < 1200)
  inline
#endif
  _Self& ignore(streamsize __n, int_type __delim);

  _Self& read(char_type* __s, streamsize __n);
  streamsize readsome(char_type* __s, streamsize __n);

public:                         // putback
  _Self& putback(char_type __c);
  _Self& unget();

public:                         // Positioning and buffer control.
  int sync();

  pos_type tellg();
  _Self& seekg(pos_type __pos);
  _Self& seekg(off_type, ios_base::seekdir);

public:                         // Helper functions for non-member extractors.
  void _M_formatted_get(_CharT& __c);
  void _M_formatted_get(_CharT* __s);
  void _M_skip_whitespace(bool __set_failbit);

private:                        // Number of characters extracted by the
  streamsize _M_gcount;         // most recent unformatted input function.

public:

#if defined (_STLP_USE_TEMPLATE_EXPORT)
  // If we are using DLL specs, we have not to use inner classes
  // end class declaration here
  typedef _Isentry<_CharT, _Traits>      sentry;
};
#  define sentry _Isentry
template <class _CharT, class _Traits>
class _Isentry {
  typedef _Isentry<_CharT, _Traits> _Self;
# else
  class sentry {
    typedef sentry _Self;
#endif
    
  private:
    const bool _M_ok;
    //    basic_streambuf<_CharT, _Traits>* _M_buf;
        
  public:
    typedef _Traits traits_type;
    
    explicit sentry(basic_istream<_CharT, _Traits>& __is,
                    bool __noskipws = false) : 
      _M_ok((__noskipws || !(__is.flags() & ios_base::skipws)) ? _M_init_noskip(__is) :  _M_init_skip(__is) )
      /* , _M_buf(__is.rdbuf()) */
      {}
    
    // Calling this constructor is the same as calling the previous one with 
    // __noskipws = true, except that it doesn't require a runtime test.
    sentry(basic_istream<_CharT, _Traits>& __is, _No_Skip_WS) : /* _M_buf(__is.rdbuf()), */
      _M_ok(_M_init_noskip(__is)) {}
    
    ~sentry() {}
    
    operator bool() const { return _M_ok; }
    
  private:                        // Disable assignment and copy constructor.
    sentry(const _Self&) : _M_ok(false) {}
    void operator=(const _Self&) {}
  };
  
# if defined (_STLP_USE_TEMPLATE_EXPORT)
#  undef sentry
# else
  // close basic_istream class definition here
};
# endif

# if defined (_STLP_USE_TEMPLATE_EXPORT)
_STLP_EXPORT_TEMPLATE_CLASS _Isentry<char, char_traits<char> >;
_STLP_EXPORT_TEMPLATE_CLASS basic_istream<char, char_traits<char> >;
#  if ! defined (_STLP_NO_WCHAR_T)
_STLP_EXPORT_TEMPLATE_CLASS _Isentry<wchar_t, char_traits<wchar_t> >;
_STLP_EXPORT_TEMPLATE_CLASS basic_istream<wchar_t, char_traits<wchar_t> >;
#  endif
# endif /* _STLP_USE_TEMPLATE_EXPORT */

// Non-member character and string extractor functions.

template <class _CharT, class _Traits>
inline basic_istream<_CharT, _Traits>& _STLP_CALL  
operator>>(basic_istream<_CharT, _Traits>& __in, _CharT& __c) {
  __in._M_formatted_get(__c);
  return __in;
}

template <class _Traits>
inline basic_istream<char, _Traits>& _STLP_CALL  
operator>>(basic_istream<char, _Traits>& __in, unsigned char& __c) {
  __in._M_formatted_get(__REINTERPRET_CAST(char&,__c));
  return __in;
}

template <class _Traits>
inline basic_istream<char, _Traits>& _STLP_CALL 
operator>>(basic_istream<char, _Traits>& __in, signed char& __c) {
  __in._M_formatted_get(__REINTERPRET_CAST(char&,__c));
  return __in;
}

template <class _CharT, class _Traits>
inline basic_istream<_CharT, _Traits>& _STLP_CALL 
operator>>(basic_istream<_CharT, _Traits>& __in, _CharT* __s) {
  __in._M_formatted_get(__s);
  return __in;
}

template <class _Traits>
inline basic_istream<char, _Traits>& _STLP_CALL 
operator>>(basic_istream<char, _Traits>& __in, unsigned char* __s) {
  __in._M_formatted_get(__REINTERPRET_CAST(char*,__s));
  return __in;
}

template <class _Traits>
inline basic_istream<char, _Traits>& _STLP_CALL 
operator>>(basic_istream<char, _Traits>& __in, signed char* __s) {
  __in._M_formatted_get(__REINTERPRET_CAST(char*,__s));
  return __in;
}

//----------------------------------------------------------------------
// istream manipulator.
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>& _STLP_CALL
ws(basic_istream<_CharT, _Traits>& __is);

//----------------------------------------------------------------------
// Class iostream.

template <class _CharT, class _Traits>
class basic_iostream 
  : public basic_istream<_CharT, _Traits>,
    public basic_ostream<_CharT, _Traits>
{
public:
  typedef basic_ios<_CharT, _Traits> _Basic_ios;

  explicit basic_iostream(basic_streambuf<_CharT, _Traits>* __buf);
  virtual ~basic_iostream();
};

# if defined (_STLP_USE_TEMPLATE_EXPORT)
_STLP_EXPORT_TEMPLATE_CLASS basic_iostream<char, char_traits<char> >;
#  if ! defined (_STLP_NO_WCHAR_T)
_STLP_EXPORT_TEMPLATE_CLASS basic_iostream<wchar_t, char_traits<wchar_t> >;
#  endif
# endif /* _STLP_USE_TEMPLATE_EXPORT */

template <class _CharT, class _Traits>
basic_streambuf<_CharT, _Traits>* _STLP_CALL _M_get_istreambuf(basic_istream<_CharT, _Traits>& __is) 
{
  return __is.rdbuf();
}

_STLP_END_NAMESPACE

# if defined (_STLP_EXPOSE_STREAM_IMPLEMENTATION) && !defined (_STLP_LINK_TIME_INSTANTIATION)
#  include <stl/_istream.c>
# endif

#endif /* _STLP_INTERNAL_ISTREAM_H */

// Local Variables:
// mode:C++
// End:

---