# vstring_util.h

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    00001 // Versatile string utility -*- C++ -*-
    00002
    00003 // Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.
    00004 //
    00005 // This file is part of the GNU ISO C++ Library.  This library is free
    00006 // software; you can redistribute it and/or modify it under the
    00007 // terms of the GNU General Public License as published by the
    00008 // Free Software Foundation; either version 2, or (at your option)
    00009 // any later version.
    00010
    00011 // This library is distributed in the hope that it will be useful,
    00012 // but WITHOUT ANY WARRANTY; without even the implied warranty of
    00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    00014 // GNU General Public License for more details.
    00015
    00016 // You should have received a copy of the GNU General Public License along
    00017 // with this library; see the file COPYING.  If not, write to the Free
    00018 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
    00019 // USA.
    00020
    00021 // As a special exception, you may use this file as part of a free software
    00022 // library without restriction.  Specifically, if other files instantiate
    00023 // templates or use macros or inline functions from this file, or you compile
    00024 // this file and link it with other files to produce an executable, this
    00025 // file does not by itself cause the resulting executable to be covered by
    00026 // the GNU General Public License.  This exception does not however
    00027 // invalidate any other reasons why the executable file might be covered by
    00028 // the GNU General Public License.
    00029
    00030 /** @file ext/vstring_util.h
    00031  *  This file is a GNU extension to the Standard C++ Library.
    00032  *  This is an internal header file, included by other library headers.
    00033  *  You should not attempt to use it directly.
    00034  */
    00035
    00036 #ifndef _VSTRING_UTIL_H
    00037 #define _VSTRING_UTIL_H 1
    00038
    00039 #pragma GCC system_header
    00040
    00041 #include <ext/vstring_fwd.h>
    00042 #include <debug/debug.h>
    00043 #include <bits/stl_function.h>  // For less
    00044 #include <bits/functexcept.h>
    00045 #include <bits/localefwd.h>
    00046 #include <bits/ostream_insert.h>
    00047 #include <bits/stl_iterator.h>
    00048 #include <ext/numeric_traits.h>
    00049 #include <bits/stl_move.h>
    00050
    00051 _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
    00052
    00053   template<typename _CharT, typename _Traits, typename _Alloc>
    00054     struct __vstring_utility
    00055     {
    00056       typedef typename _Alloc::template rebind<_CharT>::other _CharT_alloc_type;
    00057
    00058       typedef _Traits                       traits_type;
    00059       typedef typename _Traits::char_type           value_type;
    00060       typedef typename _CharT_alloc_type::size_type     size_type;
    00061       typedef typename _CharT_alloc_type::difference_type   difference_type;
    00062       typedef typename _CharT_alloc_type::pointer       pointer;
    00063       typedef typename _CharT_alloc_type::const_pointer     const_pointer;
    00064
    00065       // For __sso_string.
    00066       typedef __gnu_cxx::
    00067       __normal_iterator<pointer, __gnu_cxx::
    00068             __versa_string<_CharT, _Traits, _Alloc,
    00069                        __sso_string_base> >
    00070         __sso_iterator;
    00071       typedef __gnu_cxx::
    00072       __normal_iterator<const_pointer, __gnu_cxx::
    00073             __versa_string<_CharT, _Traits, _Alloc,
    00074                        __sso_string_base> >
    00075         __const_sso_iterator;
    00076
    00077       // For __rc_string.
    00078       typedef __gnu_cxx::
    00079       __normal_iterator<pointer, __gnu_cxx::
    00080             __versa_string<_CharT, _Traits, _Alloc,
    00081                        __rc_string_base> >
    00082         __rc_iterator;
    00083       typedef __gnu_cxx::
    00084       __normal_iterator<const_pointer, __gnu_cxx::
    00085             __versa_string<_CharT, _Traits, _Alloc,
    00086                        __rc_string_base> >
    00087         __const_rc_iterator;
    00088
    00089       // NB:  When the allocator is empty, deriving from it saves space
    00090       // (http://www.cantrip.org/emptyopt.html).
    00091       template<typename _Alloc1>
    00092         struct _Alloc_hider
    00093     : public _Alloc1
    00094     {
    00095       _Alloc_hider(_CharT* __ptr)
    00096       : _Alloc1(), _M_p(__ptr) { }
    00097
    00098       _Alloc_hider(const _Alloc1& __a, _CharT* __ptr)
    00099       : _Alloc1(__a), _M_p(__ptr) { }
    00100
    00101       _CharT*  _M_p; // The actual data.
    00102     };
    00103
    00104       // When __n = 1 way faster than the general multichar
    00105       // traits_type::copy/move/assign.
    00106       static void
    00107       _S_copy(_CharT* __d, const _CharT* __s, size_type __n)
    00108       {
    00109     if (__n == 1)
    00110       traits_type::assign(*__d, *__s);
    00111     else
    00112       traits_type::copy(__d, __s, __n);
    00113       }
    00114
    00115       static void
    00116       _S_move(_CharT* __d, const _CharT* __s, size_type __n)
    00117       {
    00118     if (__n == 1)
    00119       traits_type::assign(*__d, *__s);
    00120     else
    00121       traits_type::move(__d, __s, __n);
    00122       }
    00123
    00124       static void
    00125       _S_assign(_CharT* __d, size_type __n, _CharT __c)
    00126       {
    00127     if (__n == 1)
    00128       traits_type::assign(*__d, __c);
    00129     else
    00130       traits_type::assign(__d, __n, __c);
    00131       }
    00132
    00133       // _S_copy_chars is a separate template to permit specialization
    00134       // to optimize for the common case of pointers as iterators.
    00135       template<typename _Iterator>
    00136         static void
    00137         _S_copy_chars(_CharT* __p, _Iterator __k1, _Iterator __k2)
    00138         {
    00139       for (; __k1 != __k2; ++__k1, ++__p)
    00140         traits_type::assign(*__p, *__k1); // These types are off.
    00141     }
    00142
    00143       static void
    00144       _S_copy_chars(_CharT* __p, __sso_iterator __k1, __sso_iterator __k2)
    00145       { _S_copy_chars(__p, __k1.base(), __k2.base()); }
    00146
    00147       static void
    00148       _S_copy_chars(_CharT* __p, __const_sso_iterator __k1,
    00149             __const_sso_iterator __k2)
    00150       { _S_copy_chars(__p, __k1.base(), __k2.base()); }
    00151
    00152       static void
    00153       _S_copy_chars(_CharT* __p, __rc_iterator __k1, __rc_iterator __k2)
    00154       { _S_copy_chars(__p, __k1.base(), __k2.base()); }
    00155
    00156       static void
    00157       _S_copy_chars(_CharT* __p, __const_rc_iterator __k1,
    00158             __const_rc_iterator __k2)
    00159       { _S_copy_chars(__p, __k1.base(), __k2.base()); }
    00160
    00161       static void
    00162       _S_copy_chars(_CharT* __p, _CharT* __k1, _CharT* __k2)
    00163       { _S_copy(__p, __k1, __k2 - __k1); }
    00164
    00165       static void
    00166       _S_copy_chars(_CharT* __p, const _CharT* __k1, const _CharT* __k2)
    00167       { _S_copy(__p, __k1, __k2 - __k1); }
    00168
    00169       static int
    00170       _S_compare(size_type __n1, size_type __n2)
    00171       {
    00172     const difference_type __d = difference_type(__n1 - __n2);
    00173
    00174     if (__d > __numeric_traits_integer<int>::__max)
    00175       return __numeric_traits_integer<int>::__max;
    00176     else if (__d < __numeric_traits_integer<int>::__min)
    00177       return __numeric_traits_integer<int>::__min;
    00178     else
    00179       return int(__d);
    00180       }
    00181     };
    00182
    00183 _GLIBCXX_END_NAMESPACE
    00184
    00185 #endif /* _VSTRING_UTIL_H */