add 'as_sequence'

[SVN r16417]
2002-11-26 08:06:33 +00:00
parent 7ef7fbfdf9
commit 7bb4db7512
3 changed files with 83 additions and 0 deletions
@@ -0,0 +1,49 @@
+//-----------------------------------------------------------------------------
+// boost mpl/as_sequence.hpp header file
+// See http://www.boost.org for updates, documentation, and revision history.
+//-----------------------------------------------------------------------------
+//
+// Copyright (c) 2002
+// Aleksey Gurtovoy
+//
+// Permission to use, copy, modify, distribute and sell this software
+// and its documentation for any purpose is hereby granted without fee, 
+// provided that the above copyright notice appears in all copies and 
+// that both the copyright notice and this permission notice appear in 
+// supporting documentation. No representations are made about the 
+// suitability of this software for any purpose. It is provided "as is" 
+// without express or implied warranty.
+
+#ifndef BOOST_MPL_AS_SEQUENCE_HPP_INCLUDED
+#define BOOST_MPL_AS_SEQUENCE_HPP_INCLUDED
+
+#include "boost/mpl/is_sequence.hpp"
+#include "boost/mpl/single_view.hpp"
+#include "boost/mpl/if.hpp"
+#include "boost/mpl/aux_/void_spec.hpp"
+#include "boost/mpl/aux_/lambda_support.hpp"
+#include "boost/mpl/aux_/config/eti.hpp"
+
+namespace boost { namespace mpl {
+
+template<
+      typename BOOST_MPL_AUX_VOID_SPEC_PARAM(T)
+    >
+struct as_sequence
+    : if_< is_sequence<T>, T, single_view<T> >
+{
+    BOOST_MPL_AUX_LAMBDA_SUPPORT(1,as_sequence,(T))
+};
+
+#if defined(BOOST_MPL_MSVC_ETI_BUG)
+template<> struct as_sequence<int>
+{
+    typedef single_view<int> type;
+};
+#endif
+
+BOOST_MPL_AUX_VOID_SPEC(1, as_sequence)
+
+}} // namespace boost::mpl
+
+#endif // BOOST_MPL_AS_SEQUENCE_HPP_INCLUDED