81 lines
3.2 KiB
C++
81 lines
3.2 KiB
C++
// charset_char_traits.hh
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// This file is part of libpbe; see http://anyterm.org/
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// (C) 2007-2008 Philip Endecott
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// Distributed under the Boost Software License, Version 1.0:
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//
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// Permission is hereby granted, free of charge, to any person or organization
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// obtaining a copy of the software and accompanying documentation covered by
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// this license (the "Software") to use, reproduce, display, distribute,
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// execute, and transmit the Software, and to prepare derivative works of the
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// Software, and to permit third-parties to whom the Software is furnished to
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// do so, all subject to the following:
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//
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// The copyright notices in the Software and this entire statement, including
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// the above license grant, this restriction and the following disclaimer,
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// must be included in all copies of the Software, in whole or in part, and
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// all derivative works of the Software, unless such copies or derivative
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// works are solely in the form of machine-executable object code generated by
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// a source language processor.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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#ifndef libpbe_charset_charset_char_traits_hh
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#define libpbe_charset_charset_char_traits_hh
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#include "charset_t.hh"
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#include "charset_traits.hh"
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#include <char_traits>
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namespace pbe {
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// Character Set Character Traits
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// ------------------------------
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//
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// It would be great if we could write
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// std::char_traits<iso8859_1_char>
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// but unfortunately we can't as iso8859_1_char is only a typedef, and
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// std::char_traits can't be specialised differently for it than for char,
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// iso8859_2_char, and all the others.
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//
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// So instead we can write
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// charset_char_traits<cs::iso8859_1>
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// which is a traits class compatible with std::char_traits, for iso-8859-1
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// characters. We also have
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// charset_unit_traits<cs::iso8859_1>
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// which gives the character traits for the character set's unit type, rather
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// than its character type, which will be different in the case of variable
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// length character sets like utf8.
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// They are all defined in terms of charset_traits and std::char_traits.
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template <charset_t cset>
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struct charset_char_traits {
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typedef charset_traits<cset>::char_t char_type;
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typedef std::char_traits<char_type>::int_t int_type;
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typedef std::char_traits<char_type>::pos_t pos_type;
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typedef std::char_traits<char_type>::off_t off_type;
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typedef charset_traits<cset>::state_t state_type;
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};
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template <charset_t cset>
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struct charset_unit_traits {
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typedef charset_traits<cset>::unit_t char_type;
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typedef std::char_traits<char_type>::int_t int_type;
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typedef std::char_traits<char_type>::pos_t pos_type;
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typedef std::char_traits<char_type>::off_t off_type;
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typedef charset_traits<cset>::state_t state_type;
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};
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// FIXME the state_types in the two versions should be DIFFERENT, right???
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#endif
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