/*-----------------------------------------------------------------------------+
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Copyright (c) 2009-2009: Joachim Faulhaber
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+------------------------------------------------------------------------------+
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Distributed under the Boost Software License, Version 1.0.
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(See accompanying file LICENCE.txt or copy at
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http://www.boost.org/LICENSE_1_0.txt)
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+-----------------------------------------------------------------------------*/
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#ifndef BOOST_ICL_DETAIL_MAPPED_REFERENCE_HPP_JOFA_091108
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#define BOOST_ICL_DETAIL_MAPPED_REFERENCE_HPP_JOFA_091108
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#include <boost/type_traits/is_const.hpp>
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#include <boost/type_traits/remove_const.hpp>
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#include <boost/mpl/if.hpp>
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#include <boost/icl/type_traits/is_concept_equivalent.hpp>
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namespace boost{namespace icl
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{
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template<class FirstT, class SecondT> class mapped_reference;
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//------------------------------------------------------------------------------
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template<class Type>
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struct is_mapped_reference_combinable{
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typedef is_mapped_reference_combinable type;
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BOOST_STATIC_CONSTANT(bool, value = false);
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};
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template<class FirstT, class SecondT>
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struct is_mapped_reference_combinable<std::pair<const FirstT,SecondT> >
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{
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typedef is_mapped_reference_combinable<std::pair<const FirstT,SecondT> > type;
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BOOST_STATIC_CONSTANT(bool, value = true);
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};
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template<class FirstT, class SecondT>
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struct is_mapped_reference_combinable<std::pair<FirstT,SecondT> >
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{
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typedef is_mapped_reference_combinable<std::pair<FirstT,SecondT> > type;
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BOOST_STATIC_CONSTANT(bool, value = true);
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};
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//------------------------------------------------------------------------------
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template<class Type>
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struct is_mapped_reference_or_combinable{
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typedef is_mapped_reference_or_combinable type;
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BOOST_STATIC_CONSTANT(bool, value = is_mapped_reference_combinable<Type>::value);
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};
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template<class FirstT, class SecondT>
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struct is_mapped_reference_or_combinable<mapped_reference<FirstT,SecondT> >
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{
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typedef is_mapped_reference_or_combinable<mapped_reference<FirstT,SecondT> > type;
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BOOST_STATIC_CONSTANT(bool, value = true);
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};
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//------------------------------------------------------------------------------
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template<class FirstT, class SecondT>
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class mapped_reference
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{
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private:
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mapped_reference& operator = (const mapped_reference&);
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public:
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typedef FirstT first_type;
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typedef SecondT second_type;
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typedef mapped_reference type;
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typedef typename
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mpl::if_<is_const<second_type>,
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second_type&,
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const second_type&>::type second_reference_type;
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typedef std::pair< first_type, second_type> std_pair_type;
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typedef std::pair<const first_type, second_type> key_std_pair_type;
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const first_type& first ;
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second_reference_type second;
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mapped_reference(const FirstT& fst, second_reference_type snd) : first(fst), second(snd){}
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template<class FstT, class SndT>
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mapped_reference(const mapped_reference<FstT, SndT>& source):
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first(source.first), second(source.second){}
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template<class FstT, class SndT>
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operator std::pair<FstT,SndT>(){ return std::pair<FstT,SndT>(first, second); }
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template<class Comparand>
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typename enable_if<is_mapped_reference_or_combinable<Comparand>, bool>::type
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operator == (const Comparand& right)const
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{ return first == right.first && second == right.second; }
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template<class Comparand>
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typename enable_if<is_mapped_reference_or_combinable<Comparand>, bool>::type
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operator != (const Comparand& right)const
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{ return !(*this == right); }
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template<class Comparand>
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typename enable_if<is_mapped_reference_or_combinable<Comparand>, bool>::type
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operator < (const Comparand& right)const
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{
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return first < right.first
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||(!(right.first < first) && second < right.second);
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}
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template<class Comparand>
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typename enable_if<is_mapped_reference_or_combinable<Comparand>, bool>::type
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operator > (const Comparand& right)const
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{
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return first > right.first
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||(!(right.first > first) && second > right.second);
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}
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template<class Comparand>
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typename enable_if<is_mapped_reference_or_combinable<Comparand>, bool>::type
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operator <= (const Comparand& right)const
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{
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return !(*this > right);
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}
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template<class Comparand>
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typename enable_if<is_mapped_reference_or_combinable<Comparand>, bool>::type
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operator >= (const Comparand& right)const
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{
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return !(*this < right);
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}
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};
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//------------------------------------------------------------------------------
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template<class FirstT, class SecondT, class StdPairT>
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inline typename enable_if<is_mapped_reference_combinable<StdPairT>, bool>::type
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operator == ( const StdPairT& left,
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const mapped_reference<FirstT, SecondT>& right)
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{
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return right == left;
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}
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template<class FirstT, class SecondT, class StdPairT>
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inline typename enable_if<is_mapped_reference_combinable<StdPairT>, bool>::type
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operator != ( const StdPairT& left,
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const mapped_reference<FirstT, SecondT>& right)
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{
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return !(right == left);
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}
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//------------------------------------------------------------------------------
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template<class FirstT, class SecondT, class StdPairT>
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inline typename enable_if<is_mapped_reference_combinable<StdPairT>, bool>::type
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operator < ( const StdPairT& left,
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const mapped_reference<FirstT, SecondT>& right)
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{
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return right > left;
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}
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//------------------------------------------------------------------------------
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template<class FirstT, class SecondT, class StdPairT>
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inline typename enable_if<is_mapped_reference_combinable<StdPairT>, bool>::type
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operator > ( const StdPairT& left,
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const mapped_reference<FirstT, SecondT>& right)
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{
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return right < left;
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}
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//------------------------------------------------------------------------------
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template<class FirstT, class SecondT, class StdPairT>
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inline typename enable_if<is_mapped_reference_combinable<StdPairT>, bool>::type
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operator <= ( const StdPairT& left,
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const mapped_reference<FirstT, SecondT>& right)
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{
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return !(right < left);
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}
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//------------------------------------------------------------------------------
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template<class FirstT, class SecondT, class StdPairT>
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inline typename enable_if<is_mapped_reference_combinable<StdPairT>, bool>::type
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operator >= ( const StdPairT& left,
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const mapped_reference<FirstT, SecondT>& right)
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{
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return !(left < right);
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}
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//------------------------------------------------------------------------------
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//------------------------------------------------------------------------------
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template<class FirstT, class SecondT>
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inline mapped_reference<FirstT, SecondT> make_mapped_reference(const FirstT& left, SecondT& right)
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{ return mapped_reference<FirstT, SecondT>(left, right); }
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}} // namespace icl boost
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#endif // BOOST_ICL_DETAIL_MAPPED_REFERENCE_HPP_JOFA_091108
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