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65 lines
1.5 KiB
65 lines
1.5 KiB
/* Copyright 2006-2009 Joaquin M Lopez Munoz. |
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* Distributed under the Boost Software License, Version 1.0. |
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* (See accompanying file LICENSE_1_0.txt or copy at |
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* http://www.boost.org/LICENSE_1_0.txt) |
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* |
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* See http://www.boost.org/libs/flyweight for library home page. |
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*/ |
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#ifndef BOOST_FLYWEIGHT_DETAIL_IS_PLACEHOLDER_EXPR_HPP |
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#define BOOST_FLYWEIGHT_DETAIL_IS_PLACEHOLDER_EXPR_HPP |
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#if defined(_MSC_VER)&&(_MSC_VER>=1200) |
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#pragma once |
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#endif |
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#include <boost/type_traits/is_same.hpp> |
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#include <boost/mpl/apply.hpp> |
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#include <boost/mpl/aux_/lambda_support.hpp> |
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#include <boost/mpl/not.hpp> |
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#include <boost/preprocessor/facilities/intercept.hpp> |
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#include <boost/preprocessor/repetition/enum_params.hpp> |
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namespace boost{ |
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namespace flyweights{ |
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namespace detail{ |
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/* is_placeholder_expression<T> indicates whether T is an |
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* MPL placeholder expression. |
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*/ |
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template<typename T> |
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struct is_placeholder_expression_helper |
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{ |
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template< |
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BOOST_PP_ENUM_PARAMS( |
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BOOST_MPL_LIMIT_METAFUNCTION_ARITY,typename BOOST_PP_INTERCEPT) |
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> |
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struct apply{ |
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typedef int type; |
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}; |
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BOOST_MPL_AUX_LAMBDA_SUPPORT(1,is_placeholder_expression_helper,(T)) |
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}; |
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template<typename T> |
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struct is_placeholder_expression: |
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mpl::not_<is_same< |
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typename mpl::apply< |
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is_placeholder_expression_helper<T>, |
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BOOST_PP_ENUM_PARAMS( |
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BOOST_MPL_LIMIT_METAFUNCTION_ARITY,int BOOST_PP_INTERCEPT) |
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>::type, |
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int |
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> > |
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{}; |
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} /* namespace flyweights::detail */ |
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} /* namespace flyweights */ |
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} /* namespace boost */ |
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#endif
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