1 files changed, 29 insertions, 0 deletions
diff --git a/boost/parameter/aux_/use_default_tag.hpp b/boost/parameter/aux_/use_default_tag.hpp
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+++ b/boost/parameter/aux_/use_default_tag.hpp
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+// Copyright Daniel Wallin 2006.
+// 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_USE_DEFAULT_TAG_HPP
+#define BOOST_PARAMETER_USE_DEFAULT_TAG_HPP
+
+#include <boost/config.hpp>
+
+namespace boost { namespace parameter { namespace aux {
+
+    struct use_default_tag
+    {
+        inline BOOST_CONSTEXPR BOOST_DEFAULTED_FUNCTION(use_default_tag(), {})
+
+        inline BOOST_CONSTEXPR BOOST_DEFAULTED_FUNCTION(
+            use_default_tag(use_default_tag const&), {}
+        )
+
+        inline BOOST_CONSTEXPR use_default_tag operator()() const
+        {
+            return *this;
+        }
+    };
+}}} // namespace boost::parameter::aux
+
+#endif  // include guard
+