84 lines
2.3 KiB
C++
Executable File
84 lines
2.3 KiB
C++
Executable File
/*-----------------------------------------------------------------------------+
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Copyright (c) 2008-2011: 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_TYPE_TRAITS_SUCC_PRED_HPP_JOFA_080913
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#define BOOST_ICL_TYPE_TRAITS_SUCC_PRED_HPP_JOFA_080913
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#include <boost/icl/type_traits/is_increasing.hpp>
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namespace boost{ namespace icl
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{
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template <class IncrementableT>
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inline static IncrementableT succ(IncrementableT x) { return ++x; }
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template <class DecrementableT>
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inline static DecrementableT pred(DecrementableT x) { return --x; }
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namespace detail
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{
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template <class DomainT, bool increasing = true>
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struct successor;
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template <class DomainT>
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struct successor<DomainT, true>
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{
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typedef successor type;
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inline static DomainT apply(DomainT value){ return ++value; }
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};
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template <class DomainT>
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struct successor<DomainT, false>
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{
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typedef successor type;
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inline static DomainT apply(DomainT value){ return --value; }
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};
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template <class DomainT, bool increasing = true>
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struct predecessor;
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template <class DomainT>
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struct predecessor<DomainT, true>
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{
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typedef predecessor type;
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inline static DomainT apply(DomainT value){ return --value; }
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};
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template <class DomainT>
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struct predecessor<DomainT, false>
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{
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typedef predecessor type;
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inline static DomainT apply(DomainT value){ return ++value; }
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};
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} // namespace detail
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//------------------------------------------------------------------------------
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template <class DomainT, class Compare>
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struct successor
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{
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inline static DomainT apply(DomainT value)
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{
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return detail::successor
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<DomainT, is_increasing<DomainT,Compare>::value>::apply(value);
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}
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};
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template <class DomainT, class Compare>
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struct predecessor
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{
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inline static DomainT apply(DomainT value)
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{
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return detail::predecessor
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<DomainT, is_increasing<DomainT,Compare>::value>::apply(value);
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}
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};
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}} // namespace boost icl
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#endif
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