Add boost::ignore_unused()

include/boost/core/ignore_unused.hpp

@@ -0,0 +1,70 @@
+// Copyright (c) 2014 Adam Wulkiewicz, Lodz, Poland.
+//
+// Use, modification and distribution is subject to 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_CORE_IGNORE_UNUSED_HPP
+#define BOOST_CORE_IGNORE_UNUSED_HPP
+
+#include <boost/config.hpp>
+
+namespace boost {
+
+#ifndef BOOST_NO_CXX11_VARIADIC_TEMPLATES
+
+template <typename... Ts>
+inline void ignore_unused(Ts const& ...)
+{}
+
+template <typename... Ts>
+inline void ignore_unused()
+{}
+
+#else
+
+template <typename T1>
+inline void ignore_unused(T1 const&)
+{}
+
+template <typename T1, typename T2>
+inline void ignore_unused(T1 const&, T2 const&)
+{}
+
+template <typename T1, typename T2, typename T3>
+inline void ignore_unused(T1 const&, T2 const&, T3 const&)
+{}
+
+template <typename T1, typename T2, typename T3, typename T4>
+inline void ignore_unused(T1 const&, T2 const&, T3 const&, T4 const&)
+{}
+
+template <typename T1, typename T2, typename T3, typename T4, typename T5>
+inline void ignore_unused(T1 const&, T2 const&, T3 const&, T4 const&, T5 const&)
+{}
+
+template <typename T1>
+inline void ignore_unused()
+{}
+
+template <typename T1, typename T2>
+inline void ignore_unused()
+{}
+
+template <typename T1, typename T2, typename T3>
+inline void ignore_unused()
+{}
+
+template <typename T1, typename T2, typename T3, typename T4>
+inline void ignore_unused()
+{}
+
+template <typename T1, typename T2, typename T3, typename T4, typename T5>
+inline void ignore_unused()
+{}
+
+#endif
+
+} // namespace boost
+
+#endif // BOOST_CORE_IGNORE_UNUSED_HPP