8d9254fc8a
From-SVN: r279813
199 lines
5.4 KiB
C++
199 lines
5.4 KiB
C++
// POD character, std::char_traits specialization -*- C++ -*-
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// Copyright (C) 2002-2020 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/** @file ext/pod_char_traits.h
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* This file is a GNU extension to the Standard C++ Library.
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*/
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// Gabriel Dos Reis <gdr@integrable-solutions.net>
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// Benjamin Kosnik <bkoz@redhat.com>
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#ifndef _POD_CHAR_TRAITS_H
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#define _POD_CHAR_TRAITS_H 1
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#pragma GCC system_header
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#include <string>
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namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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// POD character abstraction.
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// NB: The char_type parameter is a subset of int_type, as to allow
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// int_type to properly hold the full range of char_type values as
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// well as EOF.
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/// @brief A POD class that serves as a character abstraction class.
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template<typename _Value, typename _Int, typename _St = std::mbstate_t>
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struct character
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{
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typedef _Value value_type;
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typedef _Int int_type;
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typedef _St state_type;
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typedef character<_Value, _Int, _St> char_type;
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value_type value;
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template<typename V2>
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static char_type
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from(const V2& v)
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{
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char_type ret = { static_cast<value_type>(v) };
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return ret;
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}
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template<typename V2>
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static V2
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to(const char_type& c)
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{
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V2 ret = { static_cast<V2>(c.value) };
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return ret;
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}
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};
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template<typename _Value, typename _Int, typename _St>
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inline bool
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operator==(const character<_Value, _Int, _St>& lhs,
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const character<_Value, _Int, _St>& rhs)
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{ return lhs.value == rhs.value; }
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template<typename _Value, typename _Int, typename _St>
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inline bool
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operator<(const character<_Value, _Int, _St>& lhs,
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const character<_Value, _Int, _St>& rhs)
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{ return lhs.value < rhs.value; }
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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/// char_traits<__gnu_cxx::character> specialization.
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template<typename _Value, typename _Int, typename _St>
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struct char_traits<__gnu_cxx::character<_Value, _Int, _St> >
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{
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typedef __gnu_cxx::character<_Value, _Int, _St> char_type;
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typedef typename char_type::int_type int_type;
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typedef typename char_type::state_type state_type;
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typedef fpos<state_type> pos_type;
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typedef streamoff off_type;
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static void
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assign(char_type& __c1, const char_type& __c2)
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{ __c1 = __c2; }
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static bool
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eq(const char_type& __c1, const char_type& __c2)
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{ return __c1 == __c2; }
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static bool
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lt(const char_type& __c1, const char_type& __c2)
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{ return __c1 < __c2; }
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static int
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compare(const char_type* __s1, const char_type* __s2, size_t __n)
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{
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for (size_t __i = 0; __i < __n; ++__i)
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if (!eq(__s1[__i], __s2[__i]))
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return lt(__s1[__i], __s2[__i]) ? -1 : 1;
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return 0;
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}
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static size_t
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length(const char_type* __s)
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{
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const char_type* __p = __s;
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while (__p->value)
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++__p;
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return (__p - __s);
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}
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static const char_type*
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find(const char_type* __s, size_t __n, const char_type& __a)
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{
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for (const char_type* __p = __s; size_t(__p - __s) < __n; ++__p)
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if (*__p == __a)
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return __p;
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return 0;
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}
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static char_type*
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move(char_type* __s1, const char_type* __s2, size_t __n)
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{
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if (__n == 0)
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return __s1;
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return static_cast<char_type*>
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(__builtin_memmove(__s1, __s2, __n * sizeof(char_type)));
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}
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static char_type*
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copy(char_type* __s1, const char_type* __s2, size_t __n)
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{
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if (__n == 0)
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return __s1;
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std::copy(__s2, __s2 + __n, __s1);
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return __s1;
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}
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static char_type*
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assign(char_type* __s, size_t __n, char_type __a)
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{
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std::fill_n(__s, __n, __a);
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return __s;
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}
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static char_type
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to_char_type(const int_type& __i)
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{ return char_type::template from(__i); }
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static int_type
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to_int_type(const char_type& __c)
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{ return char_type::template to<int_type>(__c); }
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static bool
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eq_int_type(const int_type& __c1, const int_type& __c2)
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{ return __c1 == __c2; }
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static int_type
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eof()
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{
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int_type __r = { static_cast<typename __gnu_cxx::__conditional_type
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<std::__is_integer<int_type>::__value,
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int_type, int>::__type>(-1) };
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return __r;
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}
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static int_type
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not_eof(const int_type& __c)
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{ return eq_int_type(__c, eof()) ? int_type() : __c; }
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};
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace
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#endif
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