整理

include/boost/mpl/remove_if.hpp

@@ -0,0 +1,83 @@
+
+#ifndef BOOST_MPL_REMOVE_IF_HPP_INCLUDED
+#define BOOST_MPL_REMOVE_IF_HPP_INCLUDED
+
+// Copyright Aleksey Gurtovoy 2000-2004
+// Copyright David Abrahams 2003-2004
+//
+// 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)
+//
+// See http://www.boost.org/libs/mpl for documentation.
+
+// $Id$
+// $Date$
+// $Revision$
+
+#include <boost/mpl/fold.hpp>
+#include <boost/mpl/reverse_fold.hpp>
+#include <boost/mpl/eval_if.hpp>
+#include <boost/mpl/identity.hpp>
+#include <boost/mpl/protect.hpp>
+#include <boost/mpl/lambda.hpp>
+#include <boost/mpl/apply.hpp>
+#include <boost/mpl/aux_/inserter_algorithm.hpp>
+
+namespace boost { namespace mpl {
+
+namespace aux {
+
+template< typename Pred, typename InsertOp > struct remove_if_helper
+{
+    template< typename Sequence, typename U > struct apply
+    {
+        typedef typename eval_if<
+              typename apply1<Pred,U>::type
+            , identity<Sequence>
+            , apply2<InsertOp,Sequence,U>
+            >::type type;
+    };
+};
+
+template<
+      typename Sequence
+    , typename Predicate
+    , typename Inserter
+    >
+struct remove_if_impl
+    : fold<
+          Sequence
+        , typename Inserter::state
+        , protect< aux::remove_if_helper<
+              typename lambda<Predicate>::type
+            , typename Inserter::operation
+            > >
+        >
+{
+};
+
+template<
+      typename Sequence
+    , typename Predicate
+    , typename Inserter
+    >
+struct reverse_remove_if_impl
+    : reverse_fold<
+          Sequence
+        , typename Inserter::state
+        , protect< aux::remove_if_helper<
+              typename lambda<Predicate>::type
+            , typename Inserter::operation
+            > >
+        >
+{
+};
+
+} // namespace aux
+
+BOOST_MPL_AUX_INSERTER_ALGORITHM_DEF(3, remove_if)
+
+}}
+
+#endif // BOOST_MPL_REMOVE_IF_HPP_INCLUDED