整理

include/boost/mpl/aux_/size_impl.hpp

@@ -0,0 +1,52 @@
+
+#ifndef BOOST_MPL_AUX_SIZE_IMPL_HPP_INCLUDED
+#define BOOST_MPL_AUX_SIZE_IMPL_HPP_INCLUDED
+
+// Copyright Aleksey Gurtovoy 2000-2004
+//
+// 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/size_fwd.hpp>
+#include <boost/mpl/begin_end.hpp>
+#include <boost/mpl/distance.hpp>
+#include <boost/mpl/aux_/traits_lambda_spec.hpp>
+#include <boost/mpl/aux_/config/workaround.hpp>
+
+namespace boost { namespace mpl {
+
+// default implementation; conrete sequences might override it by 
+// specializing either the 'size_impl' or the primary 'size' template
+
+template< typename Tag >
+struct size_impl
+{
+    template< typename Sequence > struct apply
+#if !BOOST_WORKAROUND(BOOST_BORLANDC, BOOST_TESTED_AT(0x561))
+        : distance<
+              typename begin<Sequence>::type
+            , typename end<Sequence>::type
+            >
+    {
+#else
+    {
+        typedef typename distance<
+              typename begin<Sequence>::type
+            , typename end<Sequence>::type
+            >::type type;
+#endif
+    };
+};
+
+BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(1, size_impl)
+
+}}
+
+#endif // BOOST_MPL_AUX_SIZE_IMPL_HPP_INCLUDED