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44 lines
1.3 KiB
C++
44 lines
1.3 KiB
C++
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/*-----------------------------------------------------------------------------+
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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_TYPE_TRAITS_ON_ABSORBTION_HPP_JOFA_100915
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#define BOOST_ICL_TYPE_TRAITS_ON_ABSORBTION_HPP_JOFA_100915
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namespace boost{ namespace icl
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{
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template<class Type, class Combiner, bool absorbs_identities>
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struct on_absorbtion;
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template<class Type, class Combiner>
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struct on_absorbtion<Type, Combiner, false>
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{
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typedef on_absorbtion type;
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typedef typename Type::codomain_type codomain_type;
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static bool is_absorbable(const codomain_type&){ return false; }
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};
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template<class Type, class Combiner>
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struct on_absorbtion<Type, Combiner, true>
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{
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typedef on_absorbtion type;
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typedef typename Type::codomain_type codomain_type;
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typedef typename Type::codomain_combine codomain_combine;
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static bool is_absorbable(const codomain_type& co_value)
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{
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return co_value == Combiner::identity_element();
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}
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};
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}} // namespace boost icl
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#endif
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