ircd::util: Split custom_ptr; make strong type; pointer conversion.

include/ircd/util/custom_ptr.h

@@ -0,0 +1,34 @@
+// 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_CUSTOM_PTR_H
+
+namespace ircd::util
+{
+	template<class T> struct custom_ptr;
+}
+
+template<class T>
+struct ircd::util::custom_ptr
+:std::unique_ptr<T, std::function<void (T *)>>
+{
+	operator T *() const;
+
+	using std::unique_ptr<T, std::function<void (T *)>>::unique_ptr;
+};
+
+template<class T>
+ircd::util::custom_ptr<T>::operator
+T *()
+const
+{
+	return this->get();
+}

include/ircd/util/util.h

@@ -35,6 +35,7 @@ namespace ircd
 #include "unwind.h"
 #include "reentrance.h"
 #include "enum.h"
+#include "custom_ptr.h"
 #include "syscall.h"
 #include "env.h"
 #include "va_rtti.h"
@@ -63,13 +64,6 @@ namespace ircd
 namespace ircd {
 namespace util {
 
-/// A standard unique_ptr but accepting an std::function for T as its custom
-/// deleter. This reduces the boilerplate burden on declaring the right
-/// unique_ptr template for custom deleters every single time.
-///
-template<class T>
-using custom_ptr = std::unique_ptr<T, std::function<void (T *)>>;
-
 //
 // Misc size() participants.
 //