# basic_ios.tcc

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    00001 // basic_ios member functions -*- C++ -*-
    00002
    00003 // Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
    00004 // 2009  Free Software Foundation, Inc.
    00005 //
    00006 // This file is part of the GNU ISO C++ Library.  This library is free
    00007 // software; you can redistribute it and/or modify it under the
    00008 // terms of the GNU General Public License as published by the
    00009 // Free Software Foundation; either version 3, or (at your option)
    00010 // any later version.
    00011
    00012 // This library is distributed in the hope that it will be useful,
    00013 // but WITHOUT ANY WARRANTY; without even the implied warranty of
    00014 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    00015 // GNU General Public License for more details.
    00016
    00017 // Under Section 7 of GPL version 3, you are granted additional
    00018 // permissions described in the GCC Runtime Library Exception, version
    00019 // 3.1, as published by the Free Software Foundation.
    00020
    00021 // You should have received a copy of the GNU General Public License and
    00022 // a copy of the GCC Runtime Library Exception along with this program;
    00023 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
    00024 // <http://www.gnu.org/licenses/>.
    00025
    00026 /** @file basic_ios.tcc
    00027  *  This is an internal header file, included by other library headers.
    00028  *  You should not attempt to use it directly.
    00029  */
    00030
    00031 #ifndef _BASIC_IOS_TCC
    00032 #define _BASIC_IOS_TCC 1
    00033
    00034 #pragma GCC system_header
    00035
    00036 _GLIBCXX_BEGIN_NAMESPACE(std)
    00037
    00038   template<typename _CharT, typename _Traits>
    00039     void
    00040     basic_ios<_CharT, _Traits>::clear(iostate __state)
    00041     {
    00042       if (this->rdbuf())
    00043     _M_streambuf_state = __state;
    00044       else
    00045       _M_streambuf_state = __state | badbit;
    00046       if (this->exceptions() & this->rdstate())
    00047     __throw_ios_failure(__N("basic_ios::clear"));
    00048     }
    00049
    00050   template<typename _CharT, typename _Traits>
    00051     basic_streambuf<_CharT, _Traits>*
    00052     basic_ios<_CharT, _Traits>::rdbuf(basic_streambuf<_CharT, _Traits>* __sb)
    00053     {
    00054       basic_streambuf<_CharT, _Traits>* __old = _M_streambuf;
    00055       _M_streambuf = __sb;
    00056       this->clear();
    00057       return __old;
    00058     }
    00059
    00060   template<typename _CharT, typename _Traits>
    00061     basic_ios<_CharT, _Traits>&
    00062     basic_ios<_CharT, _Traits>::copyfmt(const basic_ios& __rhs)
    00063     {
    00064       // _GLIBCXX_RESOLVE_LIB_DEFECTS
    00065       // 292. effects of a.copyfmt (a)
    00066       if (this != &__rhs)
    00067     {
    00068       // Per 27.1.1, do not call imbue, yet must trash all caches
    00069       // associated with imbue()
    00070
    00071       // Alloc any new word array first, so if it fails we have "rollback".
    00072       _Words* __words = (__rhs._M_word_size <= _S_local_word_size) ?
    00073                          _M_local_word : new _Words[__rhs._M_word_size];
    00074
    00075       // Bump refs before doing callbacks, for safety.
    00076       _Callback_list* __cb = __rhs._M_callbacks;
    00077       if (__cb)
    00078         __cb->_M_add_reference();
    00079       _M_call_callbacks(erase_event);
    00080       if (_M_word != _M_local_word)
    00081         {
    00082           delete [] _M_word;
    00083           _M_word = 0;
    00084         }
    00085       _M_dispose_callbacks();
    00086
    00087       // NB: Don't want any added during above.
    00088       _M_callbacks = __cb;
    00089       for (int __i = 0; __i < __rhs._M_word_size; ++__i)
    00090         __words[__i] = __rhs._M_word[__i];
    00091       _M_word = __words;
    00092       _M_word_size = __rhs._M_word_size;
    00093
    00094       this->flags(__rhs.flags());
    00095       this->width(__rhs.width());
    00096       this->precision(__rhs.precision());
    00097       this->tie(__rhs.tie());
    00098       this->fill(__rhs.fill());
    00099       _M_ios_locale = __rhs.getloc();
    00100       _M_cache_locale(_M_ios_locale);
    00101
    00102       _M_call_callbacks(copyfmt_event);
    00103
    00104       // The next is required to be the last assignment.
    00105       this->exceptions(__rhs.exceptions());
    00106     }
    00107       return *this;
    00108     }
    00109
    00110   // Locales:
    00111   template<typename _CharT, typename _Traits>
    00112     locale
    00113     basic_ios<_CharT, _Traits>::imbue(const locale& __loc)
    00114     {
    00115       locale __old(this->getloc());
    00116       ios_base::imbue(__loc);
    00117       _M_cache_locale(__loc);
    00118       if (this->rdbuf() != 0)
    00119     this->rdbuf()->pubimbue(__loc);
    00120       return __old;
    00121     }
    00122
    00123   template<typename _CharT, typename _Traits>
    00124     void
    00125     basic_ios<_CharT, _Traits>::init(basic_streambuf<_CharT, _Traits>* __sb)
    00126     {
    00127       // NB: This may be called more than once on the same object.
    00128       ios_base::_M_init();
    00129
    00130       // Cache locale data and specific facets used by iostreams.
    00131       _M_cache_locale(_M_ios_locale);
    00132
    00133       // NB: The 27.4.4.1 Postconditions Table specifies requirements
    00134       // after basic_ios::init() has been called. As part of this,
    00135       // fill() must return widen(' ') any time after init() has been
    00136       // called, which needs an imbued ctype facet of char_type to
    00137       // return without throwing an exception. Unfortunately,
    00138       // ctype<char_type> is not necessarily a required facet, so
    00139       // streams with char_type != [char, wchar_t] will not have it by
    00140       // default. Because of this, the correct value for _M_fill is
    00141       // constructed on the first call of fill(). That way,
    00142       // unformatted input and output with non-required basic_ios
    00143       // instantiations is possible even without imbuing the expected
    00144       // ctype<char_type> facet.
    00145       _M_fill = _CharT();
    00146       _M_fill_init = false;
    00147
    00148       _M_tie = 0;
    00149       _M_exception = goodbit;
    00150       _M_streambuf = __sb;
    00151       _M_streambuf_state = __sb ? goodbit : badbit;
    00152     }
    00153
    00154   template<typename _CharT, typename _Traits>
    00155     void
    00156     basic_ios<_CharT, _Traits>::_M_cache_locale(const locale& __loc)
    00157     {
    00158       if (__builtin_expect(has_facet<__ctype_type>(__loc), true))
    00159     _M_ctype = &use_facet<__ctype_type>(__loc);
    00160       else
    00161     _M_ctype = 0;
    00162
    00163       if (__builtin_expect(has_facet<__num_put_type>(__loc), true))
    00164     _M_num_put = &use_facet<__num_put_type>(__loc);
    00165       else
    00166     _M_num_put = 0;
    00167
    00168       if (__builtin_expect(has_facet<__num_get_type>(__loc), true))
    00169     _M_num_get = &use_facet<__num_get_type>(__loc);
    00170       else
    00171     _M_num_get = 0;
    00172     }
    00173
    00174   // Inhibit implicit instantiations for required instantiations,
    00175   // which are defined via explicit instantiations elsewhere.
    00176   // NB:  This syntax is a GNU extension.
    00177 #if _GLIBCXX_EXTERN_TEMPLATE
    00178   extern template class basic_ios<char>;
    00179
    00180 #ifdef _GLIBCXX_USE_WCHAR_T
    00181   extern template class basic_ios<wchar_t>;
    00182 #endif
    00183 #endif
    00184
    00185 _GLIBCXX_END_NAMESPACE
    00186
    00187 #endif