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/*=============================================================================
Copyright (c) 2001-2011 Joel de Guzman
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
==============================================================================*/
#if !defined(FUSION_SEQUENCE_FILTER_VIEW_HPP)
#define FUSION_SEQUENCE_FILTER_VIEW_HPP
#include <boost/fusion/support/detail/access.hpp>
#include <boost/fusion/support/sequence_base.hpp>
#include <boost/fusion/support/is_view.hpp>
#include <boost/fusion/view/filter_view/filter_view_iterator.hpp>
#include <boost/fusion/view/filter_view/detail/begin_impl.hpp>
#include <boost/fusion/view/filter_view/detail/end_impl.hpp>
#include <boost/fusion/view/filter_view/detail/size_impl.hpp>
#include <boost/fusion/sequence/intrinsic/begin.hpp>
#include <boost/fusion/sequence/intrinsic/end.hpp>
#include <boost/mpl/bool.hpp>
#include <boost/mpl/eval_if.hpp>
#include <boost/mpl/inherit.hpp>
#include <boost/mpl/identity.hpp>
namespace boost { namespace fusion
{
struct filter_view_tag;
struct forward_traversal_tag;
struct fusion_sequence_tag;
template <typename Sequence, typename Pred>
struct filter_view : sequence_base<filter_view<Sequence, Pred> >
{
typedef filter_view_tag fusion_tag;
typedef fusion_sequence_tag tag; // this gets picked up by MPL
typedef typename
mpl::eval_if<
traits::is_associative<Sequence>
, mpl::inherit2<forward_traversal_tag,associative_tag>
, mpl::identity<forward_traversal_tag>
>::type
category;
typedef mpl::true_ is_view;
typedef typename result_of::begin<Sequence>::type first_type;
typedef typename result_of::end<Sequence>::type last_type;
typedef Pred pred_type;
filter_view(Sequence& in_seq)
: seq(in_seq)
{}
first_type first() const { return fusion::begin(seq); }
last_type last() const { return fusion::end(seq); }
typename mpl::if_<traits::is_view<Sequence>, Sequence, Sequence&>::type seq;
private:
// silence MSVC warning C4512: assignment operator could not be generated
filter_view& operator= (filter_view const&);
};
}}
#endif
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