From 5c34e8ae67998c53c1d4016d5b9f4c02917f0ecf Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Sun, 26 Nov 2023 22:04:04 +0100
Subject: core,codec,tools: Working on c binding generation

---
 c++/core/string_literal.h | 21 +++++++++++++++++++--
 c++/core/templates.h      | 39 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 58 insertions(+), 2 deletions(-)

(limited to 'c++/core')

diff --git a/c++/core/string_literal.h b/c++/core/string_literal.h
index d530a54..7373d5c 100644
--- a/c++/core/string_literal.h
+++ b/c++/core/string_literal.h
@@ -11,6 +11,8 @@ namespace saw {
  */
 template <class CharT, size_t N> class string_literal {
 public:
+    static_assert(N > 0, "string_literal needs a null terminator");
+
 	constexpr string_literal(const CharT (&input)[N]) noexcept {
 		for (size_t i = 0; i < N; ++i) {
 			data[i] = input[i];
@@ -31,10 +33,25 @@ public:
 	operator==(const string_literal<CharTR, NR> &) const noexcept {
 		return false;
 	}
+
+	template<size_t NR>
+    constexpr string_literal<CharT, N+NR-1> operator+(const string_literal<CharT, NR>& rhs) const noexcept {
+		CharT sum[N+NR-1];
+
+		// The weird +1 happen due to needing to skip the '\0' terminator
+		for(size_t i = 0; (i+1) < N; ++i){
+				sum[i] = data[i];
+		}
+		for(size_t i = N; (i+1) < (N+NR); ++i){
+				sum[i+1] = rhs.data[i+1];
+		}
+
+		return string_literal<CharT, N+NR-1>{sum};
+	}
 };
 
 template <typename T, T... Chars>
-constexpr string_literal<T, sizeof...(Chars)> operator""_key() {
-	return string_literal<T, sizeof...(Chars) + 1u>{Chars..., '\0'};
+constexpr string_literal<T, sizeof...(Chars)+1u> operator""_sl() {
+	return string_literal<T, sizeof...(Chars) + 1u>{{Chars..., '\0'}};
 }
 } // namespace saw
diff --git a/c++/core/templates.h b/c++/core/templates.h
index e704f37..e2851a0 100644
--- a/c++/core/templates.h
+++ b/c++/core/templates.h
@@ -102,4 +102,43 @@ struct ct_multiply<T, V0, VN...> {
 	static constexpr T value = V0 * ct_multiply<T,VN...>::value;
 };
 
+namespace impl {
+template<typename T, size_t i>
+struct ct_convert_digits_table_helper {
+		static constexpr std::array<T, 16> table = {
+				'0', '1', '2', '3',
+				'4', '5', '6', '7',
+				'8', '9', 'A', 'B',
+				'C', 'D', 'E', 'F'
+		};
+
+		static constexpr T value = table[i];
+};
+
+template<uint64_t Num, uint64_t Base, uint64_t... Digs>
+struct ct_convert_digits_helper {
+		static constexpr size_t size = ct_convert_digits_helper<Num / Base, Base, Num % Base, Digs...>::size;
+		static constexpr std::array<uint64_t, size> value = ct_convert_digits_helper<Num / Base, Base, Num % Base, Digs...>::value;
+};
+
+template<uint64_t Base, uint64_t... Digs>
+struct ct_convert_digits_helper<0, Base, Digs...> {
+		static constexpr size_t size = sizeof...(Digs);
+		static constexpr std::array<uint64_t, size> value = {Digs...};
+};
+
+template<uint64_t Base>
+struct ct_convert_digits_helper<0, Base> {
+		static constexpr size_t size = 0;
+		static constexpr std::array<uint64_t, 1> value = {0};
+};
+}
+
+template<uint64_t Num, uint64_t Base>
+struct ct_convert_to_digits {
+		static_assert(Base <= 16, "Only conversion up to hex is supported");
+
+		static constexpr size_t size = impl::ct_convert_digits_helper<Num, Base>::size;
+		static constexpr std::array<uint64_t, size> value = impl::ct_convert_digits_helper<Num, Base>::value;
+};
 }
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