ircd::util: Add the construction utility device.

include/ircd/util/construction.h

@@ -0,0 +1,37 @@
+// Matrix Construct
+//
+// Copyright (C) Matrix Construct Developers, Authors & Contributors
+// Copyright (C) 2016-2019 Jason Volk <jason@zemos.net>
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice is present in all copies. The
+// full license for this software is available in the LICENSE file.
+
+#pragma once
+#define HAVE_IRCD_UTIL_CONSTRUCTION_H
+
+namespace ircd
+{
+	inline namespace util
+	{
+		struct construction;
+	}
+}
+
+struct ircd::util::construction
+{
+	template<class F,
+	         class... A>
+	construction(F&&, A&&...);
+};
+
+template<class F,
+         class... A>
+extern inline
+__attribute__((always_inline, gnu_inline, artificial))
+ircd::util::construction::construction(F&& f,
+                                       A&&... a)
+{
+	f(std::forward<A>(a)...);
+}

include/ircd/util/util.h

@@ -32,6 +32,7 @@ namespace ircd
 
 #include "typography.h"
 #include "unit_literal.h"
+#include "construction.h"
 #include "unwind.h"
 #include "reentrance.h"
 #include "enum.h"