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132 lines
4.4 KiB
C++
132 lines
4.4 KiB
C++
/*-----------------------------------------------------------------------------+
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Copyright (c) 2007-2010: Joachim Faulhaber
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+------------------------------------------------------------------------------+
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Copyright (c) 1999-2006: Cortex Software GmbH, Kantstrasse 57, Berlin
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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_SET_ALGO_HPP_JOFA_990225
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#define BOOST_ICL_SET_ALGO_HPP_JOFA_990225
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#include <boost/type_traits/remove_const.hpp>
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#include <boost/icl/detail/notate.hpp>
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#include <boost/icl/concept/container.hpp>
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#include <boost/icl/concept/set_value.hpp>
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#include <boost/icl/concept/map_value.hpp>
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namespace boost{namespace icl
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{
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namespace Set
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{
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template<class ObjectT, class ConstObjectT, class IteratorT>
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bool common_range(IteratorT& lwb, IteratorT& upb, ObjectT& x1, const ConstObjectT& x2)
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{
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// lwb and upb are iterators of x1 marking the lower and upper bound of
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// the common range of x1 and x2.
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typedef typename ConstObjectT::const_iterator ConstObject_iterator;
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// ObjectT may be const or non const.
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typedef typename remove_const<ObjectT>::type PureObjectT;
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lwb = x1.end();
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upb = x1.end();
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if(icl::is_empty(x1) || icl::is_empty(x2))
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return false;
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IteratorT x1_fst_ = x1.begin();
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IteratorT x1_lst_ = x1.end(); x1_lst_--;
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ConstObject_iterator x2_fst_ = x2.begin();
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ConstObject_iterator x2_lst_ = x2.end(); x2_lst_--;
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typename ObjectT::key_compare key_less;
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if(key_less(icl::key_value< PureObjectT>(x1_lst_),
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icl::key_value<ConstObjectT>(x2_fst_))) // {x1} {x2}
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return false;
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if(key_less(icl::key_value<ConstObjectT>(x2_lst_),
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icl::key_value< PureObjectT>(x1_fst_))) // {x2} {x1}
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return false;
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// We do have a common range
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lwb = x1.lower_bound(icl::key_value<ConstObjectT>(x2_fst_));
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upb = x1.upper_bound(icl::key_value<ConstObjectT>(x2_lst_));
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return true;
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}
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/** Function template <tt>contained_in</tt> implements the subset relation.
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<tt>contained_in(sub, super)</tt> is true if <tt>sub</tt> is contained in <tt>super</tt> */
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template<class SetType>
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inline bool within(const SetType& sub, const SetType& super)
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{
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if(&super == &sub) return true;
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if(icl::is_empty(sub)) return true;
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if(icl::is_empty(super)) return false;
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typename SetType::const_iterator common_lwb_, common_upb_;
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if(!common_range(common_lwb_, common_upb_, sub, super))
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return false;
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typename SetType::const_iterator sub_ = common_lwb_, super_;
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while(sub_ != common_upb_)
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{
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super_ = super.find(*sub_++);
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if(super_ == super.end())
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return false;
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}
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return true;
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}
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template<class SetType>
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bool intersects(const SetType& left, const SetType& right)
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{
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typename SetType::const_iterator common_lwb_right_, common_upb_right_;
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if(!common_range(common_lwb_right_, common_upb_right_, right, left))
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return false;
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typename SetType::const_iterator right_ = common_lwb_right_, found_;
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while(right_ != common_upb_right_)
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{
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found_ = left.find(*right_++);
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if(found_ != left.end())
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return true; // found a common element
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}
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// found no common element
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return false;
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}
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#ifdef BOOST_MSVC
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#pragma warning(push)
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#pragma warning(disable:4996) //'std::equal': Function call with parameters that may be unsafe - this call relies on the caller to check that the passed values are correct. To disable this warning, use -D_SCL_SECURE_NO_WARNINGS. See documentation on how to use Visual C++ 'Checked Iterators'
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#endif // I do guarantee here that I am using the parameters correctly :)
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/** Function template <tt>lexicographical_equal</tt> implements
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lexicographical equality. */
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template<class SetType>
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inline bool lexicographical_equal(const SetType& left, const SetType& right)
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{
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if(&left == &right)
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return true;
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else return left.iterative_size() == right.iterative_size()
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&& std::equal(left.begin(), left.end(), right.begin());
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}
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#ifdef BOOST_MSVC
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#pragma warning(pop)
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#endif
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} // namespace Set
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}} // namespace icl boost
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#endif
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