From 60e44cb3c8933e26d535414c49b9991cbca39154 Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Sat, 27 May 2023 20:19:15 +0200
Subject: c++: Added support for literal handling

---
 src/core/templates.h | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

(limited to 'src/core')

diff --git a/src/core/templates.h b/src/core/templates.h
index c363a16..9b4bcac 100644
--- a/src/core/templates.h
+++ b/src/core/templates.h
@@ -25,5 +25,30 @@ struct parameter_pack_type<N, TN, T...> {
 	static_assert(sizeof...(T) > 0, "Exhausted parameters");
 	using type = typename parameter_pack_type<N - 1, T...>::type;
 };
+/*
+ * Nightmare inducing compiler problems found here. Somehow non-type
+ * string_literals cannot be resolved as non-type primitive template values can.
+ * This is the workaround
+ */
+template <string_literal V, string_literal Key0, string_literal... Keys>
+struct parameter_key_pack_index_helper {
+	static constexpr size_t value =
+		(V == Key0)
+			? (0u)
+			: (1u + parameter_key_pack_index_helper<V, Keys...>::value);
+};
+
+template <string_literal V, string_literal Key0>
+struct parameter_key_pack_index_helper<V, Key0> {
+	static constexpr size_t value = (V == Key0) ? (0u) : (1u);
+};
+
+template <string_literal V, string_literal... Keys>
+struct parameter_key_pack_index {
+	static constexpr size_t value =
+		parameter_key_pack_index_helper<V, Keys...>::value;
+	static_assert(value < sizeof...(Keys),
+				  "Provided string_literal doesn't exist in searched list");
+};
 
 }
-- 
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