| /*-----------------------------------------------------------------------------+ |
| Copyright (c) 2010-2010: Joachim Faulhaber |
| +------------------------------------------------------------------------------+ |
| Distributed under the Boost Software License, Version 1.0. |
| (See accompanying file LICENCE.txt or copy at |
| http://www.boost.org/LICENSE_1_0.txt) |
| +-----------------------------------------------------------------------------*/ |
| #ifndef BOOST_ICL_TYPE_TRAITS_ON_ABSORBTION_HPP_JOFA_100915 |
| #define BOOST_ICL_TYPE_TRAITS_ON_ABSORBTION_HPP_JOFA_100915 |
| |
| namespace boost{ namespace icl |
| { |
| |
| template<class Type, class Combiner, bool absorbs_identities> |
| struct on_absorbtion; |
| |
| template<class Type, class Combiner> |
| struct on_absorbtion<Type, Combiner, false> |
| { |
| typedef on_absorbtion type; |
| typedef typename Type::codomain_type codomain_type; |
| |
| static bool is_absorbable(const codomain_type&){ return false; } |
| }; |
| |
| template<class Type, class Combiner> |
| struct on_absorbtion<Type, Combiner, true> |
| { |
| typedef on_absorbtion type; |
| typedef typename Type::codomain_type codomain_type; |
| typedef typename Type::codomain_combine codomain_combine; |
| |
| static bool is_absorbable(const codomain_type& co_value) |
| { |
| return co_value == Combiner::identity_element(); |
| } |
| }; |
| |
| }} // namespace boost icl |
| |
| #endif |
| |
| |