Added thirdparty: boost library

thirdparty/include/boost/parameter/aux_/is_maybe.hpp

@@ -0,0 +1,52 @@
+// Copyright Daniel Wallin, David Abrahams 2010.
+// 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)
+
+#ifndef BOOST_PARAMETER_IS_MAYBE_050329_HPP
+#define BOOST_PARAMETER_IS_MAYBE_050329_HPP
+
+namespace boost { namespace parameter { namespace aux {
+
+    struct maybe_base
+    {
+    };
+}}} // namespace boost::parameter::aux
+
+#if defined(BOOST_PARAMETER_CAN_USE_MP11)
+#include <type_traits>
+
+namespace boost { namespace parameter { namespace aux {
+
+    template <typename T>
+    using is_maybe = ::std::is_base_of<
+        ::boost::parameter::aux::maybe_base
+      , typename ::std::remove_const<T>::type
+    >;
+}}} // namespace boost::parameter::aux
+
+#else   // !defined(BOOST_PARAMETER_CAN_USE_MP11)
+#include <boost/mpl/bool.hpp>
+#include <boost/mpl/if.hpp>
+#include <boost/type_traits/is_base_of.hpp>
+#include <boost/type_traits/remove_const.hpp>
+
+namespace boost { namespace parameter { namespace aux {
+
+    template <typename T>
+    struct is_maybe
+      : ::boost::mpl::if_<
+            ::boost::is_base_of<
+                ::boost::parameter::aux::maybe_base
+              , typename ::boost::remove_const<T>::type
+            >
+          , ::boost::mpl::true_
+          , ::boost::mpl::false_
+        >::type
+    {
+    };
+}}} // namespace boost::parameter::aux
+
+#endif  // BOOST_PARAMETER_CAN_USE_MP11
+#endif  // include guard
+