/*

  * 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

 #define _STLP_INTERNAL_ISTREAM

 // this block is included by _ostream.h, we include it here to lower #include level

 #if defined (_STLP_HAS_WCHAR_T) && !defined (_STLP_INTERNAL_CWCHAR)

 #  include <stl/_cwchar.h>

 #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

 #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>& __istr);

 template <class _CharT, class _Traits>

 bool _M_init_noskip(basic_istream<_CharT, _Traits>& __istr);

 //----------------------------------------------------------------------

 // 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> {

   typedef basic_istream<_CharT, _Traits> _Self;

 #if defined (_STLP_MSVC) && (_STLP_MSVC >= 1300 && _STLP_MSVC <= 1310)

   //explicitely defined as private to avoid warnings:

   basic_istream(_Self const&);

   _Self& operator = (_Self const&);

 #endif

 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_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);

   _Self& operator>> (int& __val);

   _Self& operator>> (unsigned short& __val);

   _Self& operator>> (unsigned int& __val);

   _Self& operator>> (long& __val);

   _Self& operator>> (unsigned long& __val);

 #ifdef _STLP_LONG_LONG

   _Self& operator>> (_STLP_LONG_LONG& __val);

   _Self& operator>> (unsigned _STLP_LONG_LONG& __val);

 #endif

   _Self& operator>> (float& __val);

   _Self& operator>> (double& __val);

 # ifndef _STLP_NO_LONG_DOUBLE

   _Self& operator>> (long double& __val);

 # endif

 # ifndef _STLP_NO_BOOL

   _Self& operator>> (bool& __val);

 # endif

   _Self& operator>> (void*& __val);

 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>& __istr,

                     bool __noskipws = false) :

       _M_ok((__noskipws || !(__istr.flags() & ios_base::skipws)) ? _M_init_noskip(__istr) : _M_init_skip(__istr) )

       /* , _M_buf(__istr.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>& __istr, _No_Skip_WS) : /* _M_buf(__istr.rdbuf()), */

       _M_ok(_M_init_noskip(__istr)) {}

     ~sentry() {}

     operator bool() const { return _M_ok; }

   private:                        // Disable assignment and copy constructor.

     //Implementation is here only to avoid warning with some compilers.

     sentry(const _Self&) : _M_ok(false) {}

     _Self& operator=(const _Self&) { return *this; }

   };

 # 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_str, _CharT& __c) {

   __in_str._M_formatted_get(__c);

   return __in_str;

 }

 template <class _Traits>

 inline basic_istream<char, _Traits>& _STLP_CALL

 operator>>(basic_istream<char, _Traits>& __in_str, unsigned char& __c) {

   __in_str._M_formatted_get(__REINTERPRET_CAST(char&,__c));

   return __in_str;

 }

 template <class _Traits>

 inline basic_istream<char, _Traits>& _STLP_CALL

 operator>>(basic_istream<char, _Traits>& __in_str, signed char& __c) {

   __in_str._M_formatted_get(__REINTERPRET_CAST(char&,__c));

   return __in_str;

 }

 template <class _CharT, class _Traits>

 inline basic_istream<_CharT, _Traits>& _STLP_CALL

 operator>>(basic_istream<_CharT, _Traits>& __in_str, _CharT* __s) {

   __in_str._M_formatted_get(__s);

   return __in_str;

 }

 template <class _Traits>

 inline basic_istream<char, _Traits>& _STLP_CALL

 operator>>(basic_istream<char, _Traits>& __in_str, unsigned char* __s) {

   __in_str._M_formatted_get(__REINTERPRET_CAST(char*,__s));

   return __in_str;

 }

 template <class _Traits>

 inline basic_istream<char, _Traits>& _STLP_CALL

 operator>>(basic_istream<char, _Traits>& __in_str, signed char* __s) {

   __in_str._M_formatted_get(__REINTERPRET_CAST(char*,__s));

   return __in_str;

 }

 //----------------------------------------------------------------------

 // istream manipulator.

 template <class _CharT, class _Traits>

 basic_istream<_CharT, _Traits>& _STLP_CALL

 ws(basic_istream<_CharT, _Traits>& __istr) {

   if (!__istr.eof()) {

     typedef typename basic_istream<_CharT, _Traits>::sentry      _Sentry;

     _Sentry __sentry(__istr, _No_Skip_WS()); // Don't skip whitespace.

     if (__sentry)

       __istr._M_skip_whitespace(false);

   }

   return __istr;

 }

 // Helper functions for istream<>::sentry constructor.

 template <class _CharT, class _Traits>

 inline bool _M_init_skip(basic_istream<_CharT, _Traits>& __istr) {

   if (__istr.good()) {

     if (__istr.tie())

       __istr.tie()->flush();

     __istr._M_skip_whitespace(true);

   }

   if (!__istr.good()) {

     __istr.setstate(ios_base::failbit);

     return false;

   } else

     return true;

 }

 template <class _CharT, class _Traits>

 inline bool _M_init_noskip(basic_istream<_CharT, _Traits>& __istr) {

   if (__istr.good()) {

     if (__istr.tie())

       __istr.tie()->flush();

     if (!__istr.rdbuf())

       __istr.setstate(ios_base::badbit);

   }

   else

     __istr.setstate(ios_base::failbit);

   return __istr.good();

 }

 //----------------------------------------------------------------------

 // 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>& __istr)

 { return __istr.rdbuf(); }

 _STLP_END_NAMESPACE

 #if defined (_STLP_EXPOSE_STREAM_IMPLEMENTATION) && !defined (_STLP_LINK_TIME_INSTANTIATION)

 #  include <stl/_istream.c>

 #endif

 #endif /* _STLP_INTERNAL_ISTREAM */

 // Local Variables:

 // mode:C++

 // End: