From 48f8af3e73dc35d19a3d54ff70520eff64dabd09 Mon Sep 17 00:00:00 2001
From: Kohei Takahashi <flast@flast.jp>
Date: Sat, 7 Jul 2018 08:17:26 +0900
Subject: [PATCH] filter_view: Removed redundant filter operation

Iterator constructor always filters and determines right position.
---
 .../view/filter_view/detail/next_impl.hpp     | 26 ++++---------------
 1 file changed, 5 insertions(+), 21 deletions(-)

diff --git a/include/boost/fusion/view/filter_view/detail/next_impl.hpp b/include/boost/fusion/view/filter_view/detail/next_impl.hpp
index 4f174557..bd1404b9 100644
--- a/include/boost/fusion/view/filter_view/detail/next_impl.hpp
+++ b/include/boost/fusion/view/filter_view/detail/next_impl.hpp
@@ -1,5 +1,6 @@
 /*=============================================================================
     Copyright (c) 2001-2011 Joel de Guzman
+    Copyright (c) 2018 Kohei Takahashi
 
     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)
@@ -8,14 +9,10 @@
 #define FUSION_NEXT_IMPL_06052005_0900
 
 #include <boost/fusion/support/config.hpp>
-#include <boost/fusion/algorithm/query/detail/find_if.hpp>
-#include <boost/fusion/iterator/value_of.hpp>
+#include <boost/fusion/iterator/next.hpp>
+#include <boost/fusion/iterator/equal_to.hpp>
 #include <boost/mpl/eval_if.hpp>
 #include <boost/mpl/identity.hpp>
-#include <boost/mpl/lambda.hpp>
-#include <boost/mpl/quote.hpp>
-#include <boost/mpl/bind.hpp>
-#include <boost/mpl/placeholders.hpp>
 
 namespace boost { namespace fusion
 {
@@ -48,26 +45,13 @@ namespace boost { namespace fusion
                     >::type
                 next_type;
 
-                typedef typename
-                    detail::static_find_if<
-                        next_type
-                      , last_type
-                      , mpl::bind1<
-                            typename mpl::lambda<pred_type>::type
-                          , mpl::bind1<mpl::quote1<result_of::value_of>,mpl::_1>
-                        >
-                    >
-                filter;
-
-                typedef filter_iterator<
-                    category, typename filter::type, last_type, pred_type>
-                type;
+                typedef filter_iterator<category, next_type, last_type, pred_type> type;
 
                 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
                 static type
                 call(Iterator const& i)
                 {
-                    return type(filter::iter_call(i.first));
+                    return type(fusion::next(i.first));
                 }
             };
         };