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121 lines
4.5 KiB
C++
121 lines
4.5 KiB
C++
/*-----------------------------------------------------------------------------+
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Copyright (c) 2010-2010: 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_OPEN_INTERVAL_HPP_JOFA_100930
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#define BOOST_ICL_OPEN_INTERVAL_HPP_JOFA_100930
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#include <functional>
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#include <boost/concept/assert.hpp>
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#include <boost/icl/detail/concept_check.hpp>
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#include <boost/icl/concept/interval.hpp>
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#include <boost/icl/type_traits/value_size.hpp>
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#include <boost/icl/type_traits/type_to_string.hpp>
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namespace boost{namespace icl
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{
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template <class DomainT,
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ICL_COMPARE Compare = ICL_COMPARE_INSTANCE(ICL_COMPARE_DEFAULT, DomainT)>
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class open_interval
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{
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public:
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typedef open_interval<DomainT,Compare> type;
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typedef DomainT domain_type;
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typedef ICL_COMPARE_DOMAIN(Compare,DomainT) domain_compare;
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public:
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//==========================================================================
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//= Construct, copy, destruct
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//==========================================================================
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/** Default constructor; yields an empty interval <tt>(0,0)</tt>. */
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open_interval()
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: _lwb(identity_element<DomainT>::value()), _upb(identity_element<DomainT>::value())
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{
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BOOST_CONCEPT_ASSERT((DefaultConstructibleConcept<DomainT>));
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BOOST_CONCEPT_ASSERT((LessThanComparableConcept<DomainT>));
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}
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//NOTE: Compiler generated copy constructor is used
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/** Constructor for an open singleton interval <tt>(val-1,val+1)</tt> */
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explicit open_interval(const DomainT& val)
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: _lwb(pred(val)), _upb(succ(val))
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{
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BOOST_CONCEPT_ASSERT((DefaultConstructibleConcept<DomainT>));
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BOOST_CONCEPT_ASSERT((LessThanComparableConcept<DomainT>));
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// Only for discrete types this ctor creates an interval containing
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// a single element only.
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BOOST_STATIC_ASSERT((icl::is_discrete<DomainT>::value));
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BOOST_ASSERT((numeric_minimum<DomainT, domain_compare, is_numeric<DomainT>::value >
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::is_less_than(val) ));
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}
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/** Interval from <tt>low</tt> to <tt>up</tt> with bounds <tt>bounds</tt> */
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open_interval(const DomainT& low, const DomainT& up) :
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_lwb(low), _upb(up)
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{
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BOOST_CONCEPT_ASSERT((DefaultConstructibleConcept<DomainT>));
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BOOST_CONCEPT_ASSERT((LessThanComparableConcept<DomainT>));
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}
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DomainT lower()const{ return _lwb; }
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DomainT upper()const{ return _upb; }
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private:
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DomainT _lwb;
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DomainT _upb;
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};
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//==============================================================================
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//=T open_interval -> concept intervals
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//==============================================================================
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template<class DomainT, ICL_COMPARE Compare>
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struct interval_traits< icl::open_interval<DomainT, Compare> >
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{
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typedef DomainT domain_type;
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typedef ICL_COMPARE_DOMAIN(Compare,DomainT) domain_compare;
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typedef icl::open_interval<DomainT, Compare> interval_type;
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static interval_type construct(const domain_type& lo, const domain_type& up)
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{
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return interval_type(lo, up);
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}
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static domain_type lower(const interval_type& inter_val){ return inter_val.lower(); };
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static domain_type upper(const interval_type& inter_val){ return inter_val.upper(); };
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};
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//==============================================================================
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//= Type traits
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//==============================================================================
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template <class DomainT, ICL_COMPARE Compare>
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struct interval_bound_type< open_interval<DomainT,Compare> >
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{
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typedef interval_bound_type type;
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BOOST_STATIC_CONSTANT(bound_type, value = interval_bounds::static_open);
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};
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template <class DomainT, ICL_COMPARE Compare>
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struct type_to_string<icl::open_interval<DomainT,Compare> >
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{
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static std::string apply()
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{ return "(I)<"+ type_to_string<DomainT>::apply() +">"; }
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};
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template<class DomainT, ICL_COMPARE Compare>
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struct value_size<icl::open_interval<DomainT,Compare> >
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{
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static std::size_t apply(const icl::open_interval<DomainT>&)
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{ return 2; }
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};
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}} // namespace icl boost
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#endif
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