/Src/Dependencies/Boost/boost/xpressive/detail/utility/traits_utils.hpp
http://hadesmem.googlecode.com/ · C++ Header · 145 lines · 105 code · 18 blank · 22 comment · 2 complexity · 2f51be74ff943db1d1861a934a210e61 MD5 · raw file
- ///////////////////////////////////////////////////////////////////////////////
- // traits_utils.hpp
- //
- // Copyright 2008 Eric Niebler. Distributed under the Boost
- // Software License, Version 1.0. (See accompanying file
- // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
- #ifndef BOOST_XPRESSIVE_DETAIL_UTILITY_TRAITS_UTILS_HPP_EAN_10_04_2005
- #define BOOST_XPRESSIVE_DETAIL_UTILITY_TRAITS_UTILS_HPP_EAN_10_04_2005
- // MS compatible compilers support #pragma once
- #if defined(_MSC_VER) && (_MSC_VER >= 1020)
- # pragma once
- # pragma warning(push)
- # pragma warning(disable : 4100) // unreferenced formal parameter
- #endif
- #include <string>
- #include <boost/mpl/bool.hpp>
- #include <boost/mpl/assert.hpp>
- #include <boost/utility/enable_if.hpp>
- #include <boost/type_traits/is_same.hpp>
- #include <boost/iterator/transform_iterator.hpp>
- #include <boost/xpressive/detail/utility/algorithm.hpp>
- namespace boost { namespace xpressive { namespace detail
- {
- ///////////////////////////////////////////////////////////////////////////////
- // char_cast
- //
- template<typename ToChar, typename FromChar, typename Traits>
- inline ToChar
- char_cast(FromChar from, Traits const &, typename enable_if<is_same<ToChar, FromChar> >::type * = 0)
- {
- return from;
- }
- template<typename ToChar, typename FromChar, typename Traits>
- inline ToChar
- char_cast(FromChar from, Traits const &tr, typename disable_if<is_same<ToChar, FromChar> >::type * = 0)
- {
- BOOST_MPL_ASSERT((is_same<FromChar, char>));
- return tr.widen(from);
- }
- ///////////////////////////////////////////////////////////////////////////////
- // widen_fun
- //
- template<typename Traits>
- struct widen_fun
- {
- typedef typename Traits::char_type result_type;
- explicit widen_fun(Traits const &tr)
- : traits_(tr)
- {}
- result_type operator()(char ch) const
- {
- return this->traits_.widen(ch);
- }
- Traits const &traits_;
- };
- ///////////////////////////////////////////////////////////////////////////////
- // string_cast_
- //
- template<
- typename To
- , typename From
- , typename ToChar = typename detail::range_data<To>::type
- , typename FromChar = typename detail::range_data<From>::type
- >
- struct string_cast_
- {
- BOOST_MPL_ASSERT((is_same<FromChar, char>));
- typedef To const result_type;
- template<typename Traits>
- result_type operator()(From const &from, Traits const &tr) const
- {
- widen_fun<Traits> widen(tr);
- To to(
- boost::make_transform_iterator(detail::data_begin(from), widen)
- , boost::make_transform_iterator(detail::data_end(from), widen)
- );
- return to;
- }
- };
- template<typename To, typename From, typename Char>
- struct string_cast_<To, From, Char, Char>
- {
- typedef To const result_type;
- template<typename Traits>
- result_type operator()(From const &from, Traits const &) const
- {
- To to(detail::data_begin(from), detail::data_end(from));
- return to;
- }
- };
- template<typename From, typename Char>
- struct string_cast_<From, From, Char, Char>
- {
- typedef From const &result_type;
- template<typename Traits>
- result_type operator()(From const &from, Traits const &) const
- {
- return from;
- }
- };
- ///////////////////////////////////////////////////////////////////////////////
- // string_cast
- //
- template<typename To, typename From, typename Traits>
- typename string_cast_<To, From>::result_type
- string_cast(From const &from, Traits const &tr)
- {
- return string_cast_<To, From>()(from, tr);
- }
- ///////////////////////////////////////////////////////////////////////////////
- // translate
- //
- template<typename Char, typename Traits>
- inline Char translate(Char ch, Traits const &tr, mpl::false_) // case-sensitive
- {
- return tr.translate(ch);
- }
- template<typename Char, typename Traits>
- inline Char translate(Char ch, Traits const &tr, mpl::true_) // case-insensitive
- {
- return tr.translate_nocase(ch);
- }
- }}} // namespace boost::xpressive::detail
- #if defined(_MSC_VER) && (_MSC_VER >= 1020)
- # pragma warning(pop)
- #endif
- #endif