/home/ntakagi/work/STLport-5.1.5/stlport/stl/_istreambuf_iterator.h Go to the documentation of this file. /* * 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. * */ // WARNING: This is an internal header file, included by other C++ // standard library headers. You should not attempt to use this header // file directly. #ifndef _STLP_INTERNAL_ISTREAMBUF_ITERATOR_H #define _STLP_INTERNAL_ISTREAMBUF_ITERATOR_H #ifndef _STLP_INTERNAL_ITERATOR_BASE_H # include <stl/_iterator_base.h> #endif #ifndef _STLP_INTERNAL_STREAMBUF # include <stl/_streambuf.h> #endif _STLP_BEGIN_NAMESPACE // defined in _istream.h template <class _CharT, class _Traits> extern basic_streambuf<_CharT, _Traits>* _STLP_CALL _M_get_istreambuf(basic_istream<_CharT, _Traits>& ) ; // We do not read any characters until operator* is called. operator* calls sgetc // unless the iterator is unchanged from the last call in which case a cached value is // used. Calls to operator++ use sbumpc. template<class _CharT, class _Traits> class istreambuf_iterator : public iterator<input_iterator_tag, _CharT, typename _Traits::off_type, _CharT*, _CharT&> { public: typedef _CharT char_type; typedef _Traits traits_type; typedef typename _Traits::int_type int_type; typedef basic_streambuf<_CharT, _Traits> streambuf_type; typedef basic_istream<_CharT, _Traits> istream_type; typedef input_iterator_tag iterator_category; typedef _CharT value_type; typedef typename _Traits::off_type difference_type; typedef const _CharT* pointer; typedef const _CharT& reference; public: istreambuf_iterator(streambuf_type* __p = 0) { this->_M_init(__p); } // istreambuf_iterator(basic_istream<_CharT, _Traits>& __is) { this->_M_init(_M_get_istreambuf(__is)); } inline istreambuf_iterator(basic_istream<_CharT, _Traits>& __is); char_type operator*() const { this->_M_getc(); return _M_c; } istreambuf_iterator<_CharT, _Traits>& operator++() { _M_buf->sbumpc(); _M_have_c = false; return *this; } istreambuf_iterator<_CharT, _Traits> operator++(int); bool equal(const istreambuf_iterator<_CharT, _Traits>& __i) const { if (this->_M_buf) this->_M_getc(); if (__i._M_buf) __i._M_getc(); return this->_M_eof == __i._M_eof; } private: void _M_init(streambuf_type* __p) { _M_buf = __p; _M_eof = (__p == 0); _M_have_c = false; } void _M_getc() const { if (_M_have_c) return; int_type __c = _M_buf->sgetc(); # if !defined (_STLP_NEED_MUTABLE) /* && ! defined (__SUNPRO_CC) */ _M_c = traits_type::to_char_type(__c); _M_eof = traits_type::eq_int_type(__c, traits_type::eof()); _M_have_c = true; # else typedef istreambuf_iterator<_CharT,_Traits> _Self; _Self* __that = __CONST_CAST(_Self*, this); __that->_M_c = __STATIC_CAST(_CharT, traits_type::to_char_type(__c)); __that->_M_eof = traits_type::eq_int_type(__c, traits_type::eof()); __that->_M_have_c = true; # endif } private: streambuf_type* _M_buf; mutable _CharT _M_c; mutable bool _M_eof; mutable bool _M_have_c; }; template<class _CharT, class _Traits> inline istreambuf_iterator<_CharT, _Traits>::istreambuf_iterator(basic_istream<_CharT, _Traits>& __is) { this->_M_init(_M_get_istreambuf(__is)); } template<class _CharT, class _Traits> inline bool _STLP_CALL operator==(const istreambuf_iterator<_CharT, _Traits>& __x, const istreambuf_iterator<_CharT, _Traits>& __y) { return __x.equal(__y); } #ifdef _STLP_USE_SEPARATE_RELOPS_NAMESPACE template<class _CharT, class _Traits> inline bool _STLP_CALL operator!=(const istreambuf_iterator<_CharT, _Traits>& __x, const istreambuf_iterator<_CharT, _Traits>& __y) { return !__x.equal(__y); } #endif /* _STLP_USE_SEPARATE_RELOPS_NAMESPACE */ # if defined (_STLP_USE_TEMPLATE_EXPORT) _STLP_EXPORT_TEMPLATE_CLASS istreambuf_iterator<char, char_traits<char> >; # if defined (INSTANTIATE_WIDE_STREAMS) _STLP_EXPORT_TEMPLATE_CLASS istreambuf_iterator<wchar_t, char_traits<wchar_t> >; # endif # endif /* _STLP_USE_TEMPLATE_EXPORT */ # ifdef _STLP_USE_OLD_HP_ITERATOR_QUERIES template <class _CharT, class _Traits> inline input_iterator_tag _STLP_CALL iterator_category(const istreambuf_iterator<_CharT, _Traits>&) { return input_iterator_tag(); } template <class _CharT, class _Traits> inline streamoff* _STLP_CALL distance_type(const istreambuf_iterator<_CharT, _Traits>&) { return (streamoff*)0; } template <class _CharT, class _Traits> inline _CharT* _STLP_CALL value_type(const istreambuf_iterator<_CharT, _Traits>&) { return (_CharT*)0; } # endif template <class _CharT, class _Traits> istreambuf_iterator<_CharT, _Traits> istreambuf_iterator<_CharT, _Traits>::operator++(int) { _M_getc(); // __tmp should avoid any future actions under // underlined buffer---during call of operator *() // (due to buffer for *this and __tmp are the same). istreambuf_iterator<_CharT, _Traits> __tmp = *this; _M_buf->sbumpc(); _M_have_c = false; return __tmp; } _STLP_END_NAMESPACE #endif /* _STLP_INTERNAL_ISTREAMBUF_ITERATOR_H */ // Local Variables: // mode:C++ // End:

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