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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_PREDICATE_HPP_JOFA_101102 #define BOOST_ICL_TYPE_TRAITS_PREDICATE_HPP_JOFA_101102 namespace boost{namespace icl { // naming convention // predicate: n-ary predicate // property: unary predicate // relation: binary predicate // Unary predicates template <class Type> class property { public: typedef Type argument_type; typedef bool result_type; }; template <class Type> class member_property : public property<Type> { public: member_property( bool(Type::* pred)()const ): property<Type>(), m_pred(pred){} bool operator()(const Type& x)const { return (x.*m_pred)(); } private: bool(Type::* m_pred)()const; } ; // Binary predicates: relations template <class LeftT, class RightT> class relation { public: typedef LeftT first_argument_type; typedef RightT second_argument_type; typedef bool result_type; }; }} // namespace icl boost #endif
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