From 744e02fb01214c84b9487f3c135844fdc1b011e2 Mon Sep 17 00:00:00 2001
From: ADAM David Alan Martin <adam@recursive.engineer>
Date: Tue, 19 Oct 2021 22:28:45 -0400
Subject: [PATCH] Concept-like overloading of functions support.

When using `enable_if` clauses in templates, we need an NTTP
in the mix to let us get good overloading support.  The boolean
true/false trick of the `enable_if` second parameter actually
doesn't work for many situations.
---
 Meta/overload.h | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)
 create mode 100644 Meta/overload.h

diff --git a/Meta/overload.h b/Meta/overload.h
new file mode 100644
index 0000000..a9421ea
--- /dev/null
+++ b/Meta/overload.h
@@ -0,0 +1,32 @@
+static_assert( __cplusplus > 201700, "C++17 Required" );
+
+#pragma once
+
+#include <Alepha/Alepha.h>
+
+namespace Alepha::Hydrogen::Meta
+{
+	inline namespace exports { inline namespace template_overload {} }
+
+	namespace detail::template_overload
+	{
+		inline namespace exports {}
+
+		template< std::size_t >
+		struct holder
+		{
+			struct overload_t;
+		};
+
+		namespace exports
+		{
+			template< std::size_t i >
+			using overload= typename holder< i >::overload_t *;
+		}
+	}
+
+	namespace exports::template_overload
+	{
+		using namespace detail::template_overload::exports;
+	}
+}