diff options
Diffstat (limited to 'libstdc++-v3/include/bits/streambuf_iterator.h')
| -rw-r--r-- | libstdc++-v3/include/bits/streambuf_iterator.h | 402 |
1 files changed, 402 insertions, 0 deletions
diff --git a/libstdc++-v3/include/bits/streambuf_iterator.h b/libstdc++-v3/include/bits/streambuf_iterator.h new file mode 100644 index 000000000..83ae6785c --- /dev/null +++ b/libstdc++-v3/include/bits/streambuf_iterator.h @@ -0,0 +1,402 @@ +// Streambuf iterators + +// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, +// 2006, 2007, 2009, 2010, 2011 +// 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 3, 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. + +// Under Section 7 of GPL version 3, you are granted additional +// permissions described in the GCC Runtime Library Exception, version +// 3.1, as published by the Free Software Foundation. + +// You should have received a copy of the GNU General Public License and +// a copy of the GCC Runtime Library Exception along with this program; +// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see +// <http://www.gnu.org/licenses/>. + +/** @file bits/streambuf_iterator.h + * This is an internal header file, included by other library headers. + * Do not attempt to use it directly. @headername{iterator} + */ + +#ifndef _STREAMBUF_ITERATOR_H +#define _STREAMBUF_ITERATOR_H 1 + +#pragma GCC system_header + +#include <streambuf> +#include <debug/debug.h> + +namespace std _GLIBCXX_VISIBILITY(default) +{ +_GLIBCXX_BEGIN_NAMESPACE_VERSION + + /** + * @addtogroup iterators + * @{ + */ + + // 24.5.3 Template class istreambuf_iterator + /// Provides input iterator semantics for streambufs. + template<typename _CharT, typename _Traits> + class istreambuf_iterator + : public iterator<input_iterator_tag, _CharT, typename _Traits::off_type, + _CharT*, _CharT&> + { + public: + // Types: + //@{ + /// Public typedefs + 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; + //@} + + template<typename _CharT2> + friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value, + ostreambuf_iterator<_CharT2> >::__type + copy(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>, + ostreambuf_iterator<_CharT2>); + + template<bool _IsMove, typename _CharT2> + friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value, + _CharT2*>::__type + __copy_move_a2(istreambuf_iterator<_CharT2>, + istreambuf_iterator<_CharT2>, _CharT2*); + + template<typename _CharT2> + friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value, + istreambuf_iterator<_CharT2> >::__type + find(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>, + const _CharT2&); + + private: + // 24.5.3 istreambuf_iterator + // p 1 + // If the end of stream is reached (streambuf_type::sgetc() + // returns traits_type::eof()), the iterator becomes equal to + // the "end of stream" iterator value. + // NB: This implementation assumes the "end of stream" value + // is EOF, or -1. + mutable streambuf_type* _M_sbuf; + mutable int_type _M_c; + + public: + /// Construct end of input stream iterator. + _GLIBCXX_CONSTEXPR istreambuf_iterator() throw() + : _M_sbuf(0), _M_c(traits_type::eof()) { } + + /// Construct start of input stream iterator. + istreambuf_iterator(istream_type& __s) throw() + : _M_sbuf(__s.rdbuf()), _M_c(traits_type::eof()) { } + + /// Construct start of streambuf iterator. + istreambuf_iterator(streambuf_type* __s) throw() + : _M_sbuf(__s), _M_c(traits_type::eof()) { } + + /// Return the current character pointed to by iterator. This returns + /// streambuf.sgetc(). It cannot be assigned. NB: The result of + /// operator*() on an end of stream is undefined. + char_type + operator*() const + { +#ifdef _GLIBCXX_DEBUG_PEDANTIC + // Dereferencing a past-the-end istreambuf_iterator is a + // libstdc++ extension + __glibcxx_requires_cond(!_M_at_eof(), + _M_message(__gnu_debug::__msg_deref_istreambuf) + ._M_iterator(*this)); +#endif + return traits_type::to_char_type(_M_get()); + } + + /// Advance the iterator. Calls streambuf.sbumpc(). + istreambuf_iterator& + operator++() + { + __glibcxx_requires_cond(!_M_at_eof(), + _M_message(__gnu_debug::__msg_inc_istreambuf) + ._M_iterator(*this)); + if (_M_sbuf) + { + _M_sbuf->sbumpc(); + _M_c = traits_type::eof(); + } + return *this; + } + + /// Advance the iterator. Calls streambuf.sbumpc(). + istreambuf_iterator + operator++(int) + { + __glibcxx_requires_cond(!_M_at_eof(), + _M_message(__gnu_debug::__msg_inc_istreambuf) + ._M_iterator(*this)); + + istreambuf_iterator __old = *this; + if (_M_sbuf) + { + __old._M_c = _M_sbuf->sbumpc(); + _M_c = traits_type::eof(); + } + return __old; + } + + // _GLIBCXX_RESOLVE_LIB_DEFECTS + // 110 istreambuf_iterator::equal not const + // NB: there is also number 111 (NAD, Future) pending on this function. + /// Return true both iterators are end or both are not end. + bool + equal(const istreambuf_iterator& __b) const + { return _M_at_eof() == __b._M_at_eof(); } + + private: + int_type + _M_get() const + { + const int_type __eof = traits_type::eof(); + int_type __ret = __eof; + if (_M_sbuf) + { + if (!traits_type::eq_int_type(_M_c, __eof)) + __ret = _M_c; + else if (!traits_type::eq_int_type((__ret = _M_sbuf->sgetc()), + __eof)) + _M_c = __ret; + else + _M_sbuf = 0; + } + return __ret; + } + + bool + _M_at_eof() const + { + const int_type __eof = traits_type::eof(); + return traits_type::eq_int_type(_M_get(), __eof); + } + }; + + template<typename _CharT, typename _Traits> + inline bool + operator==(const istreambuf_iterator<_CharT, _Traits>& __a, + const istreambuf_iterator<_CharT, _Traits>& __b) + { return __a.equal(__b); } + + template<typename _CharT, typename _Traits> + inline bool + operator!=(const istreambuf_iterator<_CharT, _Traits>& __a, + const istreambuf_iterator<_CharT, _Traits>& __b) + { return !__a.equal(__b); } + + /// Provides output iterator semantics for streambufs. + template<typename _CharT, typename _Traits> + class ostreambuf_iterator + : public iterator<output_iterator_tag, void, void, void, void> + { + public: + // Types: + //@{ + /// Public typedefs + typedef _CharT char_type; + typedef _Traits traits_type; + typedef basic_streambuf<_CharT, _Traits> streambuf_type; + typedef basic_ostream<_CharT, _Traits> ostream_type; + //@} + + template<typename _CharT2> + friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value, + ostreambuf_iterator<_CharT2> >::__type + copy(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>, + ostreambuf_iterator<_CharT2>); + + private: + streambuf_type* _M_sbuf; + bool _M_failed; + + public: + /// Construct output iterator from ostream. + ostreambuf_iterator(ostream_type& __s) throw () + : _M_sbuf(__s.rdbuf()), _M_failed(!_M_sbuf) { } + + /// Construct output iterator from streambuf. + ostreambuf_iterator(streambuf_type* __s) throw () + : _M_sbuf(__s), _M_failed(!_M_sbuf) { } + + /// Write character to streambuf. Calls streambuf.sputc(). + ostreambuf_iterator& + operator=(_CharT __c) + { + if (!_M_failed && + _Traits::eq_int_type(_M_sbuf->sputc(__c), _Traits::eof())) + _M_failed = true; + return *this; + } + + /// Return *this. + ostreambuf_iterator& + operator*() + { return *this; } + + /// Return *this. + ostreambuf_iterator& + operator++(int) + { return *this; } + + /// Return *this. + ostreambuf_iterator& + operator++() + { return *this; } + + /// Return true if previous operator=() failed. + bool + failed() const throw() + { return _M_failed; } + + ostreambuf_iterator& + _M_put(const _CharT* __ws, streamsize __len) + { + if (__builtin_expect(!_M_failed, true) + && __builtin_expect(this->_M_sbuf->sputn(__ws, __len) != __len, + false)) + _M_failed = true; + return *this; + } + }; + + // Overloads for streambuf iterators. + template<typename _CharT> + typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value, + ostreambuf_iterator<_CharT> >::__type + copy(istreambuf_iterator<_CharT> __first, + istreambuf_iterator<_CharT> __last, + ostreambuf_iterator<_CharT> __result) + { + if (__first._M_sbuf && !__last._M_sbuf && !__result._M_failed) + { + bool __ineof; + __copy_streambufs_eof(__first._M_sbuf, __result._M_sbuf, __ineof); + if (!__ineof) + __result._M_failed = true; + } + return __result; + } + + template<bool _IsMove, typename _CharT> + typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value, + ostreambuf_iterator<_CharT> >::__type + __copy_move_a2(_CharT* __first, _CharT* __last, + ostreambuf_iterator<_CharT> __result) + { + const streamsize __num = __last - __first; + if (__num > 0) + __result._M_put(__first, __num); + return __result; + } + + template<bool _IsMove, typename _CharT> + typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value, + ostreambuf_iterator<_CharT> >::__type + __copy_move_a2(const _CharT* __first, const _CharT* __last, + ostreambuf_iterator<_CharT> __result) + { + const streamsize __num = __last - __first; + if (__num > 0) + __result._M_put(__first, __num); + return __result; + } + + template<bool _IsMove, typename _CharT> + typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value, + _CharT*>::__type + __copy_move_a2(istreambuf_iterator<_CharT> __first, + istreambuf_iterator<_CharT> __last, _CharT* __result) + { + typedef istreambuf_iterator<_CharT> __is_iterator_type; + typedef typename __is_iterator_type::traits_type traits_type; + typedef typename __is_iterator_type::streambuf_type streambuf_type; + typedef typename traits_type::int_type int_type; + + if (__first._M_sbuf && !__last._M_sbuf) + { + streambuf_type* __sb = __first._M_sbuf; + int_type __c = __sb->sgetc(); + while (!traits_type::eq_int_type(__c, traits_type::eof())) + { + const streamsize __n = __sb->egptr() - __sb->gptr(); + if (__n > 1) + { + traits_type::copy(__result, __sb->gptr(), __n); + __sb->__safe_gbump(__n); + __result += __n; + __c = __sb->underflow(); + } + else + { + *__result++ = traits_type::to_char_type(__c); + __c = __sb->snextc(); + } + } + } + return __result; + } + + template<typename _CharT> + typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value, + istreambuf_iterator<_CharT> >::__type + find(istreambuf_iterator<_CharT> __first, + istreambuf_iterator<_CharT> __last, const _CharT& __val) + { + typedef istreambuf_iterator<_CharT> __is_iterator_type; + typedef typename __is_iterator_type::traits_type traits_type; + typedef typename __is_iterator_type::streambuf_type streambuf_type; + typedef typename traits_type::int_type int_type; + + if (__first._M_sbuf && !__last._M_sbuf) + { + const int_type __ival = traits_type::to_int_type(__val); + streambuf_type* __sb = __first._M_sbuf; + int_type __c = __sb->sgetc(); + while (!traits_type::eq_int_type(__c, traits_type::eof()) + && !traits_type::eq_int_type(__c, __ival)) + { + streamsize __n = __sb->egptr() - __sb->gptr(); + if (__n > 1) + { + const _CharT* __p = traits_type::find(__sb->gptr(), + __n, __val); + if (__p) + __n = __p - __sb->gptr(); + __sb->__safe_gbump(__n); + __c = __sb->sgetc(); + } + else + __c = __sb->snextc(); + } + + if (!traits_type::eq_int_type(__c, traits_type::eof())) + __first._M_c = __c; + else + __first._M_sbuf = 0; + } + return __first; + } + +// @} group iterators + +_GLIBCXX_END_NAMESPACE_VERSION +} // namespace + +#endif |