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162 lines
5.3 KiB
C
162 lines
5.3 KiB
C
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/*
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* Copyright (c) 1999
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* Silicon Graphics Computer Systems, Inc.
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*
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* Copyright (c) 1999
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* Boris Fomitchev
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*
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* This material is provided "as is", with absolutely no warranty expressed
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* or implied. Any use is at your own risk.
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*
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* Permission to use or copy this software for any purpose is hereby granted
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* without fee, provided the above notices are retained on all copies.
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* Permission to modify the code and to distribute modified code is granted,
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* provided the above notices are retained, and a notice that the code was
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* modified is included with the above copyright notice.
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*
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*/
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// WARNING: This is an internal header file, included by other C++
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// standard library headers. You should not attempt to use this header
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// file directly.
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#ifndef _STLP_INTERNAL_ISTREAMBUF_ITERATOR_H
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#define _STLP_INTERNAL_ISTREAMBUF_ITERATOR_H
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#ifndef _STLP_INTERNAL_ITERATOR_BASE_H
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# include <stl/_iterator_base.h>
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#endif
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#ifndef _STLP_INTERNAL_STREAMBUF
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# include <stl/_streambuf.h>
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#endif
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_STLP_BEGIN_NAMESPACE
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// defined in _istream.h
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template <class _CharT, class _Traits>
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extern basic_streambuf<_CharT, _Traits>* _STLP_CALL _M_get_istreambuf(basic_istream<_CharT, _Traits>& ) ;
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// We do not read any characters until operator* is called. operator* calls sgetc
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// unless the iterator is unchanged from the last call in which case a cached value is
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// used. Calls to operator++ use sbumpc.
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template<class _CharT, class _Traits>
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class istreambuf_iterator :
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public iterator<input_iterator_tag, _CharT, typename _Traits::off_type, _CharT*, _CharT&>
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{
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public:
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typedef _CharT char_type;
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typedef _Traits traits_type;
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typedef typename _Traits::int_type int_type;
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typedef basic_streambuf<_CharT, _Traits> streambuf_type;
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typedef basic_istream<_CharT, _Traits> istream_type;
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typedef input_iterator_tag iterator_category;
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typedef _CharT value_type;
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typedef typename _Traits::off_type difference_type;
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typedef const _CharT* pointer;
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typedef const _CharT& reference;
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public:
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istreambuf_iterator(streambuf_type* __p = 0) { this->_M_init(__p); }
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// istreambuf_iterator(basic_istream<_CharT, _Traits>& __is) { this->_M_init(_M_get_istreambuf(__is)); }
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inline istreambuf_iterator(basic_istream<_CharT, _Traits>& __is);
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char_type operator*() const { this->_M_getc(); return _M_c; }
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istreambuf_iterator<_CharT, _Traits>& operator++() {
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_M_buf->sbumpc();
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_M_have_c = false;
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return *this;
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}
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istreambuf_iterator<_CharT, _Traits> operator++(int);
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bool equal(const istreambuf_iterator<_CharT, _Traits>& __i) const {
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if (this->_M_buf)
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this->_M_getc();
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if (__i._M_buf)
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__i._M_getc();
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return this->_M_eof == __i._M_eof;
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}
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private:
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void _M_init(streambuf_type* __p) {
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_M_buf = __p;
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_M_eof = (__p == 0);
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_M_have_c = false;
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}
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void _M_getc() const {
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if (_M_have_c)
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return;
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int_type __c = _M_buf->sgetc();
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_STLP_MUTABLE(_Self, _M_c) = traits_type::to_char_type(__c);
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_STLP_MUTABLE(_Self, _M_eof) = traits_type::eq_int_type(__c, traits_type::eof());
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_STLP_MUTABLE(_Self, _M_have_c) = true;
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}
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private:
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streambuf_type* _M_buf;
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mutable _CharT _M_c;
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mutable bool _M_eof;
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mutable bool _M_have_c;
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};
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template<class _CharT, class _Traits>
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inline istreambuf_iterator<_CharT, _Traits>::istreambuf_iterator(basic_istream<_CharT, _Traits>& __is)
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{ this->_M_init(_M_get_istreambuf(__is)); }
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template<class _CharT, class _Traits>
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inline bool _STLP_CALL operator==(const istreambuf_iterator<_CharT, _Traits>& __x,
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const istreambuf_iterator<_CharT, _Traits>& __y) {
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return __x.equal(__y);
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}
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#ifdef _STLP_USE_SEPARATE_RELOPS_NAMESPACE
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template<class _CharT, class _Traits>
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inline bool _STLP_CALL operator!=(const istreambuf_iterator<_CharT, _Traits>& __x,
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const istreambuf_iterator<_CharT, _Traits>& __y) {
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return !__x.equal(__y);
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}
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#endif /* _STLP_USE_SEPARATE_RELOPS_NAMESPACE */
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# if defined (_STLP_USE_TEMPLATE_EXPORT)
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_STLP_EXPORT_TEMPLATE_CLASS istreambuf_iterator<char, char_traits<char> >;
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# if defined (INSTANTIATE_WIDE_STREAMS)
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_STLP_EXPORT_TEMPLATE_CLASS istreambuf_iterator<wchar_t, char_traits<wchar_t> >;
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# endif
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# endif /* _STLP_USE_TEMPLATE_EXPORT */
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# ifdef _STLP_USE_OLD_HP_ITERATOR_QUERIES
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template <class _CharT, class _Traits>
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inline input_iterator_tag _STLP_CALL iterator_category(const istreambuf_iterator<_CharT, _Traits>&) { return input_iterator_tag(); }
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template <class _CharT, class _Traits>
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inline streamoff* _STLP_CALL
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distance_type(const istreambuf_iterator<_CharT, _Traits>&) { return (streamoff*)0; }
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template <class _CharT, class _Traits>
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inline _CharT* _STLP_CALL value_type(const istreambuf_iterator<_CharT, _Traits>&) { return (_CharT*)0; }
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# endif
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template <class _CharT, class _Traits>
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istreambuf_iterator<_CharT, _Traits>
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istreambuf_iterator<_CharT, _Traits>::operator++(int) {
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_M_getc(); // __tmp should avoid any future actions under
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// underlined buffer---during call of operator *()
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// (due to buffer for *this and __tmp are the same).
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istreambuf_iterator<_CharT, _Traits> __tmp = *this;
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_M_buf->sbumpc();
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_M_have_c = false;
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return __tmp;
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}
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_STLP_END_NAMESPACE
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#endif /* _STLP_INTERNAL_ISTREAMBUF_ITERATOR_H */
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// Local Variables:
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// mode:C++
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// End:
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