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// -*- C++ -*-
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// Copyright (C) 2005 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 2, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING. If not, write to the Free
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// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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// USA.
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// As a special exception, you may use this file as part of a free software
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// library without restriction. Specifically, if other files instantiate
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// templates or use macros or inline functions from this file, or you compile
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// this file and link it with other files to produce an executable, this
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// file does not by itself cause the resulting executable to be covered by
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// the GNU General Public License. This exception does not however
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// invalidate any other reasons why the executable file might be covered by
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// the GNU General Public License.
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// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
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// Permission to use, copy, modify, sell, and distribute this software
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// is hereby granted without fee, provided that the above copyright
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// notice appears in all copies, and that both that copyright notice and
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// this permission notice appear in supporting documentation. None of
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// the above authors, nor IBM Haifa Research Laboratories, make any
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// representation about the suitability of this software for any
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// purpose. It is provided "as is" without express or implied warranty.
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/**
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* @file typelist_filter.hpp
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* Contains typelist utilities.
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* Typelists are an idea by Andrei Alexandrescu.
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*/
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#ifndef TYPELIST_FILTER_HPP
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#define TYPELIST_FILTER_HPP
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#ifdef _MSC_VER
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#pragma warning(disable: 4503)
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#endif // #ifdef _MSC_VER
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#include <ext/pb_assoc/detail/type_utils.hpp>
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namespace detail
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{
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template<class Typelist_Chain, template<typename T>
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class Pred>
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struct typelist_chain_filter_;
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template<template<typename T>
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class Pred>
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struct typelist_chain_filter_<
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null_type,
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Pred>
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{
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typedef null_type type;
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};
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template<class Hd, class Tl, template<typename T>
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class Pred>
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struct typelist_chain_filter_<
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typelist_chain<Hd, Tl>,
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Pred>
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{
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typedef typename typelist_chain_filter_< Tl, Pred>::type rest;
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enum
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{
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include_hd = Pred<Hd>::value
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};
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typedef
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typename cond_type<
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include_hd,
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typelist_chain<
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Hd,
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rest>,
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rest>::type
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type;
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};
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} // namespace detail
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#endif // #ifndef TYPELIST_FILTER_HPP
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