New upstream version 8.1.0

thirdparty/source/boost_1_61_0/boost/mpl/always.hpp

@@ -0,0 +1,38 @@
+
+#ifndef BOOST_MPL_ALWAYS_HPP_INCLUDED
+#define BOOST_MPL_ALWAYS_HPP_INCLUDED
+
+// Copyright Aleksey Gurtovoy 2001-2004
+//
+// 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/aux_/preprocessor/default_params.hpp>
+#include <boost/mpl/aux_/na.hpp>
+#include <boost/mpl/aux_/arity_spec.hpp>
+
+namespace boost { namespace mpl {
+
+template< typename Value > struct always
+{
+    template<
+        BOOST_MPL_PP_DEFAULT_PARAMS(BOOST_MPL_LIMIT_METAFUNCTION_ARITY, typename T, na)
+        >
+    struct apply
+    {
+        typedef Value type;
+    };
+};
+
+BOOST_MPL_AUX_ARITY_SPEC(0, always)
+
+}}
+
+#endif // BOOST_MPL_ALWAYS_HPP_INCLUDED