liuxiaolong
2021-07-20 58d904a328c0d849769b483e901a0be9426b8209
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/*-----------------------------------------------------------------------------+    
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_ADDS_INVERSELY_HPP_JOFA_100829
#define BOOST_ICL_TYPE_TRAITS_ADDS_INVERSELY_HPP_JOFA_100829
 
#include <boost/icl/type_traits/has_inverse.hpp>
#include <boost/icl/functors.hpp>
 
namespace boost{ namespace icl
{
 
template<class Type, class Combiner>
struct adds_inversely
{
    typedef adds_inversely type;
    BOOST_STATIC_CONSTANT(bool, 
        value = (mpl::and_<has_inverse<Type>, is_negative<Combiner> >::value)); 
};
 
}} // namespace boost icl
 
#endif // BOOST_ICL_TYPE_TRAITS_ADDS_INVERSELY_HPP_JOFA_100829