xref: /openbsd-src/gnu/gcc/libstdc++-v3/include/ext/pod_char_traits.h (revision 404b540a9034ac75a6199ad1a32d1bbc7a0d4210)
1*404b540aSrobert // POD character, std::char_traits specialization -*- C++ -*-
2*404b540aSrobert 
3*404b540aSrobert // Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
4*404b540aSrobert //
5*404b540aSrobert // This file is part of the GNU ISO C++ Library.  This library is free
6*404b540aSrobert // software; you can redistribute it and/or modify it under the
7*404b540aSrobert // terms of the GNU General Public License as published by the
8*404b540aSrobert // Free Software Foundation; either version 2, or (at your option)
9*404b540aSrobert // any later version.
10*404b540aSrobert 
11*404b540aSrobert // This library is distributed in the hope that it will be useful,
12*404b540aSrobert // but WITHOUT ANY WARRANTY; without even the implied warranty of
13*404b540aSrobert // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14*404b540aSrobert // GNU General Public License for more details.
15*404b540aSrobert 
16*404b540aSrobert // You should have received a copy of the GNU General Public License along
17*404b540aSrobert // with this library; see the file COPYING.  If not, write to the Free
18*404b540aSrobert // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
19*404b540aSrobert // USA.
20*404b540aSrobert 
21*404b540aSrobert // As a special exception, you may use this file as part of a free software
22*404b540aSrobert // library without restriction.  Specifically, if other files instantiate
23*404b540aSrobert // templates or use macros or inline functions from this file, or you compile
24*404b540aSrobert // this file and link it with other files to produce an executable, this
25*404b540aSrobert // file does not by itself cause the resulting executable to be covered by
26*404b540aSrobert // the GNU General Public License.  This exception does not however
27*404b540aSrobert // invalidate any other reasons why the executable file might be covered by
28*404b540aSrobert // the GNU General Public License.
29*404b540aSrobert 
30*404b540aSrobert /** @file ext/pod_char_traits.h
31*404b540aSrobert  *  This file is a GNU extension to the Standard C++ Library.
32*404b540aSrobert  */
33*404b540aSrobert 
34*404b540aSrobert // Gabriel Dos Reis <gdr@integrable-solutions.net>
35*404b540aSrobert // Benjamin Kosnik <bkoz@redhat.com>
36*404b540aSrobert 
37*404b540aSrobert #ifndef _POD_CHAR_TRAITS_H
38*404b540aSrobert #define _POD_CHAR_TRAITS_H 1
39*404b540aSrobert 
40*404b540aSrobert #include <string>
41*404b540aSrobert 
42*404b540aSrobert _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
43*404b540aSrobert 
44*404b540aSrobert   // POD character abstraction.
45*404b540aSrobert   // NB: The char_type parameter is a subset of int_type, as to allow
46*404b540aSrobert   // int_type to properly hold the full range of char_type values as
47*404b540aSrobert   // well as EOF.
48*404b540aSrobert   /// @brief A POD class that serves as a character abstraction class.
49*404b540aSrobert   template<typename V, typename I, typename S = mbstate_t>
50*404b540aSrobert     struct character
51*404b540aSrobert     {
52*404b540aSrobert       typedef V				value_type;
53*404b540aSrobert       typedef I				int_type;
54*404b540aSrobert       typedef S				state_type;
55*404b540aSrobert       typedef character<V, I, S>	char_type;
56*404b540aSrobert 
57*404b540aSrobert       value_type	value;
58*404b540aSrobert 
59*404b540aSrobert       template<typename V2>
60*404b540aSrobert         static char_type
fromcharacter61*404b540aSrobert         from(const V2& v)
62*404b540aSrobert         {
63*404b540aSrobert 	  char_type ret = { static_cast<value_type>(v) };
64*404b540aSrobert 	  return ret;
65*404b540aSrobert 	}
66*404b540aSrobert 
67*404b540aSrobert       template<typename V2>
68*404b540aSrobert         static V2
tocharacter69*404b540aSrobert         to(const char_type& c)
70*404b540aSrobert         {
71*404b540aSrobert 	  V2 ret = { static_cast<V2>(c.value) };
72*404b540aSrobert 	  return ret;
73*404b540aSrobert 	}
74*404b540aSrobert 
75*404b540aSrobert     };
76*404b540aSrobert 
77*404b540aSrobert   template<typename V, typename I, typename S>
78*404b540aSrobert     inline bool
79*404b540aSrobert     operator==(const character<V, I, S>& lhs, const character<V, I, S>& rhs)
80*404b540aSrobert     { return lhs.value == rhs.value; }
81*404b540aSrobert 
82*404b540aSrobert   template<typename V, typename I, typename S>
83*404b540aSrobert     inline bool
84*404b540aSrobert     operator<(const character<V, I, S>& lhs, const character<V, I, S>& rhs)
85*404b540aSrobert     { return lhs.value < rhs.value; }
86*404b540aSrobert 
87*404b540aSrobert _GLIBCXX_END_NAMESPACE
88*404b540aSrobert 
89*404b540aSrobert _GLIBCXX_BEGIN_NAMESPACE(std)
90*404b540aSrobert 
91*404b540aSrobert   /// char_traits<__gnu_cxx::character> specialization.
92*404b540aSrobert   template<typename V, typename I, typename S>
93*404b540aSrobert     struct char_traits<__gnu_cxx::character<V, I, S> >
94*404b540aSrobert     {
95*404b540aSrobert       typedef __gnu_cxx::character<V, I, S>	char_type;
96*404b540aSrobert       typedef typename char_type::int_type	int_type;
97*404b540aSrobert       typedef typename char_type::state_type	state_type;
98*404b540aSrobert       typedef fpos<state_type>			pos_type;
99*404b540aSrobert       typedef streamoff				off_type;
100*404b540aSrobert 
101*404b540aSrobert       static void
102*404b540aSrobert       assign(char_type& __c1, const char_type& __c2)
103*404b540aSrobert       { __c1 = __c2; }
104*404b540aSrobert 
105*404b540aSrobert       static bool
106*404b540aSrobert       eq(const char_type& __c1, const char_type& __c2)
107*404b540aSrobert       { return __c1 == __c2; }
108*404b540aSrobert 
109*404b540aSrobert       static bool
110*404b540aSrobert       lt(const char_type& __c1, const char_type& __c2)
111*404b540aSrobert       { return __c1 < __c2; }
112*404b540aSrobert 
113*404b540aSrobert       static int
114*404b540aSrobert       compare(const char_type* __s1, const char_type* __s2, size_t __n)
115*404b540aSrobert       {
116*404b540aSrobert 	for (size_t __i = 0; __i < __n; ++__i)
117*404b540aSrobert 	  if (!eq(__s1[__i], __s2[__i]))
118*404b540aSrobert 	    return lt(__s1[__i], __s2[__i]) ? -1 : 1;
119*404b540aSrobert 	return 0;
120*404b540aSrobert       }
121*404b540aSrobert 
122*404b540aSrobert       static size_t
123*404b540aSrobert       length(const char_type* __s)
124*404b540aSrobert       {
125*404b540aSrobert 	const char_type* __p = __s;
126*404b540aSrobert 	while (__p->value)
127*404b540aSrobert 	  ++__p;
128*404b540aSrobert 	return (__p - __s);
129*404b540aSrobert       }
130*404b540aSrobert 
131*404b540aSrobert       static const char_type*
132*404b540aSrobert       find(const char_type* __s, size_t __n, const char_type& __a)
133*404b540aSrobert       {
134*404b540aSrobert 	for (const char_type* __p = __s; size_t(__p - __s) < __n; ++__p)
135*404b540aSrobert 	  if (*__p == __a)
136*404b540aSrobert 	    return __p;
137*404b540aSrobert 	return 0;
138*404b540aSrobert       }
139*404b540aSrobert 
140*404b540aSrobert       static char_type*
141*404b540aSrobert       move(char_type* __s1, const char_type* __s2, size_t __n)
142*404b540aSrobert       {
143*404b540aSrobert 	return static_cast<char_type*>(std::memmove(__s1, __s2,
144*404b540aSrobert 						    __n * sizeof(char_type)));
145*404b540aSrobert       }
146*404b540aSrobert 
147*404b540aSrobert       static char_type*
148*404b540aSrobert       copy(char_type* __s1, const char_type* __s2, size_t __n)
149*404b540aSrobert       {
150*404b540aSrobert 	std::copy(__s2, __s2 + __n, __s1);
151*404b540aSrobert 	return __s1;
152*404b540aSrobert       }
153*404b540aSrobert 
154*404b540aSrobert       static char_type*
155*404b540aSrobert       assign(char_type* __s, size_t __n, char_type __a)
156*404b540aSrobert       {
157*404b540aSrobert 	std::fill_n(__s, __n, __a);
158*404b540aSrobert         return __s;
159*404b540aSrobert       }
160*404b540aSrobert 
161*404b540aSrobert       static char_type
162*404b540aSrobert       to_char_type(const int_type& __i)
163*404b540aSrobert       { return char_type::template from(__i); }
164*404b540aSrobert 
165*404b540aSrobert       static int_type
166*404b540aSrobert       to_int_type(const char_type& __c)
167*404b540aSrobert       { return char_type::template to<int_type>(__c); }
168*404b540aSrobert 
169*404b540aSrobert       static bool
170*404b540aSrobert       eq_int_type(const int_type& __c1, const int_type& __c2)
171*404b540aSrobert       { return __c1 == __c2; }
172*404b540aSrobert 
173*404b540aSrobert       static int_type
174*404b540aSrobert       eof()
175*404b540aSrobert       {
176*404b540aSrobert 	int_type __r = { -1 };
177*404b540aSrobert 	return __r;
178*404b540aSrobert       }
179*404b540aSrobert 
180*404b540aSrobert       static int_type
181*404b540aSrobert       not_eof(const int_type& __c)
182*404b540aSrobert       { return eq_int_type(__c, eof()) ? int_type() : __c; }
183*404b540aSrobert     };
184*404b540aSrobert 
185*404b540aSrobert _GLIBCXX_END_NAMESPACE
186*404b540aSrobert 
187*404b540aSrobert #endif
188