整理

include/boost/mpl/map/aux_/erase_key_impl.hpp

@@ -0,0 +1,53 @@
+
+#ifndef BOOST_MPL_MAP_AUX_ERASE_KEY_IMPL_HPP_INCLUDED
+#define BOOST_MPL_MAP_AUX_ERASE_KEY_IMPL_HPP_INCLUDED
+
+// Copyright Aleksey Gurtovoy 2003-2004
+// 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/erase_key_fwd.hpp>
+#include <boost/mpl/map/aux_/has_key_impl.hpp>
+#include <boost/mpl/map/aux_/item.hpp>
+#include <boost/mpl/map/aux_/tag.hpp>
+#include <boost/mpl/identity.hpp>
+#include <boost/mpl/base.hpp>
+#include <boost/mpl/eval_if.hpp>
+
+#include <boost/type_traits/is_same.hpp>
+
+namespace boost { namespace mpl {
+
+template<>
+struct erase_key_impl< aux::map_tag >
+{
+    template< 
+          typename Map
+        , typename Key
+        > 
+    struct apply
+        : eval_if< 
+              has_key_impl<aux::map_tag>::apply<Map,Key>
+            , eval_if< 
+                  is_same< Key,typename Map::key_ > 
+                , base<Map>
+                , identity< m_mask<Key,Map> >
+                >
+            , identity<Map>
+            >
+    {
+    };
+};
+
+}}
+
+#endif // BOOST_MPL_MAP_AUX_ERASE_KEY_IMPL_HPP_INCLUDED