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///////////////////////////////////////////////////////////////////////////////
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// Copyright 2008 Eric Niebler. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_XPRESSIVE_DETAIL_UTILITY_TRAITS_UTILS_HPP_EAN_10_04_2005
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#define BOOST_XPRESSIVE_DETAIL_UTILITY_TRAITS_UTILS_HPP_EAN_10_04_2005
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// MS compatible compilers support #pragma once
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#if defined(_MSC_VER) && (_MSC_VER >= 1020)
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# pragma warning(push)
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# pragma warning(disable : 4100) // unreferenced formal parameter
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#include <boost/mpl/bool.hpp>
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#include <boost/mpl/assert.hpp>
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#include <boost/utility/enable_if.hpp>
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#include <boost/type_traits/is_same.hpp>
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#include <boost/iterator/transform_iterator.hpp>
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#include <boost/xpressive/detail/utility/algorithm.hpp>
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namespace boost { namespace xpressive { namespace detail
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///////////////////////////////////////////////////////////////////////////////
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template<typename ToChar, typename FromChar, typename Traits>
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char_cast(FromChar from, Traits const &, typename enable_if<is_same<ToChar, FromChar> >::type * = 0)
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template<typename ToChar, typename FromChar, typename Traits>
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char_cast(FromChar from, Traits const &tr, typename disable_if<is_same<ToChar, FromChar> >::type * = 0)
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BOOST_MPL_ASSERT((is_same<FromChar, char>));
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return tr.widen(from);
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///////////////////////////////////////////////////////////////////////////////
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template<typename Traits>
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typedef typename Traits::char_type result_type;
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explicit widen_fun(Traits const &tr)
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result_type operator()(char ch) const
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return this->traits_.widen(ch);
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Traits const &traits_;
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///////////////////////////////////////////////////////////////////////////////
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, typename ToChar = typename detail::range_data<To>::type
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, typename FromChar = typename detail::range_data<From>::type
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BOOST_MPL_ASSERT((is_same<FromChar, char>));
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typedef To const result_type;
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template<typename Traits>
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result_type operator()(From const &from, Traits const &tr) const
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widen_fun<Traits> widen(tr);
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boost::make_transform_iterator(detail::data_begin(from), widen)
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, boost::make_transform_iterator(detail::data_end(from), widen)
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template<typename To, typename From, typename Char>
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struct string_cast_<To, From, Char, Char>
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typedef To const result_type;
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template<typename Traits>
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result_type operator()(From const &from, Traits const &) const
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To to(detail::data_begin(from), detail::data_end(from));
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template<typename From, typename Char>
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struct string_cast_<From, From, Char, Char>
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typedef From const &result_type;
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template<typename Traits>
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result_type operator()(From const &from, Traits const &) const
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///////////////////////////////////////////////////////////////////////////////
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template<typename To, typename From, typename Traits>
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typename string_cast_<To, From>::result_type
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string_cast(From const &from, Traits const &tr)
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return string_cast_<To, From>()(from, tr);
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///////////////////////////////////////////////////////////////////////////////
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template<typename Char, typename Traits>
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inline Char translate(Char ch, Traits const &tr, mpl::false_) // case-sensitive
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return tr.translate(ch);
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template<typename Char, typename Traits>
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inline Char translate(Char ch, Traits const &tr, mpl::true_) // case-insensitive
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return tr.translate_nocase(ch);
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}}} // namespace boost::xpressive::detail
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#if defined(_MSC_VER) && (_MSC_VER >= 1020)
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# pragma warning(pop)