11.2.0/ext/pod_char_traits.h

// POD character, std::char_traits specialization -*- C++ -*-

// Copyright (C) 2002-2021 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 ext/pod_char_traits.h
 *  This file is a GNU extension to the Standard C++ Library.
 */

// Gabriel Dos Reis <gdr@integrable-solutions.net>
// Benjamin Kosnik <bkoz@redhat.com>

#ifndef _POD_CHAR_TRAITS_H
#define _POD_CHAR_TRAITS_H 1

#pragma GCC system_header

#include <string>

namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

  // POD character abstraction.
  // NB: The char_type parameter is a subset of int_type, as to allow
  // int_type to properly hold the full range of char_type values as
  // well as EOF.
  /// @brief A POD class that serves as a character abstraction class.
  template<typename _Value, typename _Int, typename _St = std::mbstate_t>
    struct character
    {
      typedef _Value                            value_type;
      typedef _Int                              int_type;
      typedef _St                               state_type;
      typedef character<_Value, _Int, _St>      char_type;

      value_type        value;

      template<typename V2>
        static char_type
        from(const V2& v)
        {
          char_type ret = { static_cast<value_type>(v) };
          return ret;
        }

      template<typename V2>
        static V2
        to(const char_type& c)
        {
          V2 ret = { static_cast<V2>(c.value) };
          return ret;
        }

    };

  template<typename _Value, typename _Int, typename _St>
    inline bool
    operator==(const character<_Value, _Int, _St>& lhs,
               const character<_Value, _Int, _St>& rhs)
    { return lhs.value == rhs.value; }

  template<typename _Value, typename _Int, typename _St>
    inline bool
    operator<(const character<_Value, _Int, _St>& lhs,
              const character<_Value, _Int, _St>& rhs)
    { return lhs.value < rhs.value; }

_GLIBCXX_END_NAMESPACE_VERSION
} // namespace

namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

  /// char_traits<__gnu_cxx::character> specialization.
  template<typename _Value, typename _Int, typename _St>
    struct char_traits<__gnu_cxx::character<_Value, _Int, _St> >
    {
      typedef __gnu_cxx::character<_Value, _Int, _St>   char_type;
      typedef typename char_type::int_type              int_type;
      typedef typename char_type::state_type            state_type;
      typedef fpos<state_type>                          pos_type;
      typedef streamoff                                 off_type;

      static void
      assign(char_type& __c1, const char_type& __c2)
      { __c1 = __c2; }

      static bool
      eq(const char_type& __c1, const char_type& __c2)
      { return __c1 == __c2; }

      static bool
      lt(const char_type& __c1, const char_type& __c2)
      { return __c1 < __c2; }

      static int
      compare(const char_type* __s1, const char_type* __s2, size_t __n)
      {
        for (size_t __i = 0; __i < __n; ++__i)
          if (!eq(__s1[__i], __s2[__i]))
            return lt(__s1[__i], __s2[__i]) ? -1 : 1;
        return 0;
      }

      static size_t
      length(const char_type* __s)
      {
        const char_type* __p = __s;
        while (__p->value)
          ++__p;
        return (__p - __s);
      }

      static const char_type*
      find(const char_type* __s, size_t __n, const char_type& __a)
      {
        for (const char_type* __p = __s; size_t(__p - __s) < __n; ++__p)
          if (*__p == __a)
            return __p;
        return 0;
      }

      static char_type*
      move(char_type* __s1, const char_type* __s2, size_t __n)
      { 
        if (__n == 0)
          return __s1;
        return static_cast<char_type*>
          (__builtin_memmove(__s1, __s2, __n * sizeof(char_type)));
      }

      static char_type*
      copy(char_type* __s1, const char_type* __s2, size_t __n)
      {
        if (__n == 0)
          return __s1;
        std::copy(__s2, __s2 + __n, __s1);
        return __s1;
      }

      static char_type*
      assign(char_type* __s, size_t __n, char_type __a)
      {
        std::fill_n(__s, __n, __a);
        return __s;
      }

      static char_type
      to_char_type(const int_type& __i)
      { return char_type::template from(__i); }

      static int_type
      to_int_type(const char_type& __c)
      { return char_type::template to<int_type>(__c); }

      static bool
      eq_int_type(const int_type& __c1, const int_type& __c2)
      { return __c1 == __c2; }

      static int_type
      eof() 
      {
        int_type __r = { static_cast<typename __gnu_cxx::__conditional_type
                         <std::__is_integer<int_type>::__value,
                         int_type, int>::__type>(-1) };
        return __r;
      }

      static int_type
      not_eof(const int_type& __c)
      { return eq_int_type(__c, eof()) ? int_type() : __c; }
    };

_GLIBCXX_END_NAMESPACE_VERSION
} // namespace

#endif
Revision:	1166
Committed:	Tue Oct 26 14:22:36 2021 UTC (4 years ago) by rossy
Content type:	text/x-chdr
File size:	5556 byte(s)
Log Message:	Daodan: Replace MinGW build env with an up-to-date MSYS2 env
#	Content
1	// POD character, std::char_traits specialization -- C++ --
2
3	// Copyright (C) 2002-2021 Free Software Foundation, Inc.
4	//
5	// This file is part of the GNU ISO C++ Library. This library is free
6	// software; you can redistribute it and/or modify it under the
7	// terms of the GNU General Public License as published by the
8	// Free Software Foundation; either version 3, or (at your option)
9	// any later version.
10
11	// This library is distributed in the hope that it will be useful,
12	// but WITHOUT ANY WARRANTY; without even the implied warranty of
13	// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14	// GNU General Public License for more details.
15
16	// Under Section 7 of GPL version 3, you are granted additional
17	// permissions described in the GCC Runtime Library Exception, version
18	// 3.1, as published by the Free Software Foundation.
19
20	// You should have received a copy of the GNU General Public License and
21	// a copy of the GCC Runtime Library Exception along with this program;
22	// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23	// <http://www.gnu.org/licenses/>.
24
25	/** @file ext/pod_char_traits.h
26	* This file is a GNU extension to the Standard C++ Library.
27	*/
28
29	// Gabriel Dos Reis <gdr@integrable-solutions.net>
30	// Benjamin Kosnik <bkoz@redhat.com>
31
32	#ifndef _POD_CHAR_TRAITS_H
33	#define _POD_CHAR_TRAITS_H 1
34
35	#pragma GCC system_header
36
37	#include <string>
38
39	namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
40	{
41	_GLIBCXX_BEGIN_NAMESPACE_VERSION
42
43	// POD character abstraction.
44	// NB: The char_type parameter is a subset of int_type, as to allow
45	// int_type to properly hold the full range of char_type values as
46	// well as EOF.
47	/// @brief A POD class that serves as a character abstraction class.
48	template<typename _Value, typename _Int, typename _St = std::mbstate_t>
49	struct character
50	{
51	typedef _Value value_type;
52	typedef _Int int_type;
53	typedef _St state_type;
54	typedef character<_Value, _Int, _St> char_type;
55
56	value_type value;
57
58	template<typename V2>
59	static char_type
60	from(const V2& v)
61	{
62	char_type ret = { static_cast<value_type>(v) };
63	return ret;
64	}
65
66	template<typename V2>
67	static V2
68	to(const char_type& c)
69	{
70	V2 ret = { static_cast<V2>(c.value) };
71	return ret;
72	}
73
74	};
75
76	template<typename _Value, typename _Int, typename _St>
77	inline bool
78	operator==(const character<_Value, _Int, _St>& lhs,
79	const character<_Value, _Int, _St>& rhs)
80	{ return lhs.value == rhs.value; }
81
82	template<typename _Value, typename _Int, typename _St>
83	inline bool
84	operator<(const character<_Value, _Int, _St>& lhs,
85	const character<_Value, _Int, _St>& rhs)
86	{ return lhs.value < rhs.value; }
87
88	_GLIBCXX_END_NAMESPACE_VERSION
89	} // namespace
90
91	namespace std _GLIBCXX_VISIBILITY(default)
92	{
93	_GLIBCXX_BEGIN_NAMESPACE_VERSION
94
95	/// char_traits<__gnu_cxx::character> specialization.
96	template<typename _Value, typename _Int, typename _St>
97	struct char_traits<__gnu_cxx::character<_Value, _Int, _St> >
98	{
99	typedef __gnu_cxx::character<_Value, _Int, _St> char_type;
100	typedef typename char_type::int_type int_type;
101	typedef typename char_type::state_type state_type;
102	typedef fpos<state_type> pos_type;
103	typedef streamoff off_type;
104
105	static void
106	assign(char_type& __c1, const char_type& __c2)
107	{ __c1 = __c2; }
108
109	static bool
110	eq(const char_type& __c1, const char_type& __c2)
111	{ return __c1 == __c2; }
112
113	static bool
114	lt(const char_type& __c1, const char_type& __c2)
115	{ return __c1 < __c2; }
116
117	static int
118	compare(const char_type* __s1, const char_type* __s2, size_t __n)
119	{
120	for (size_t __i = 0; __i < __n; ++__i)
121	if (!eq(__s1[__i], __s2[__i]))
122	return lt(__s1[__i], __s2[__i]) ? -1 : 1;
123	return 0;
124	}
125
126	static size_t
127	length(const char_type* __s)
128	{
129	const char_type* __p = __s;
130	while (__p->value)
131	++__p;
132	return (__p - __s);
133	}
134
135	static const char_type*
136	find(const char_type* __s, size_t __n, const char_type& __a)
137	{
138	for (const char_type* __p = __s; size_t(__p - __s) < __n; ++__p)
139	if (*__p == __a)
140	return __p;
141	return 0;
142	}
143
144	static char_type*
145	move(char_type* __s1, const char_type* __s2, size_t __n)
146	{
147	if (__n == 0)
148	return __s1;
149	return static_cast<char_type*>
150	(__builtin_memmove(__s1, __s2, __n * sizeof(char_type)));
151	}
152
153	static char_type*
154	copy(char_type* __s1, const char_type* __s2, size_t __n)
155	{
156	if (__n == 0)
157	return __s1;
158	std::copy(__s2, __s2 + __n, __s1);
159	return __s1;
160	}
161
162	static char_type*
163	assign(char_type* __s, size_t __n, char_type __a)
164	{
165	std::fill_n(__s, __n, __a);
166	return __s;
167	}
168
169	static char_type
170	to_char_type(const int_type& __i)
171	{ return char_type::template from(__i); }
172
173	static int_type
174	to_int_type(const char_type& __c)
175	{ return char_type::template to<int_type>(__c); }
176
177	static bool
178	eq_int_type(const int_type& __c1, const int_type& __c2)
179	{ return __c1 == __c2; }
180
181	static int_type
182	eof()
183	{
184	int_type __r = { static_cast<typename __gnu_cxx::__conditional_type
185	<std::__is_integer<int_type>::__value,
186	int_type, int>::__type>(-1) };
187	return __r;
188	}
189
190	static int_type
191	not_eof(const int_type& __c)
192	{ return eq_int_type(__c, eof()) ? int_type() : __c; }
193	};
194
195	_GLIBCXX_END_NAMESPACE_VERSION
196	} // namespace
197
198	#endif