No idea what this is

This stuff's been laying around for months and years,
just committing and crossing fingers - pro coding here!

include/duckhandy/implem/reversed_sized_array_bt.hpp

@@ -18,6 +18,7 @@
 #ifndef idFC25566D624140559C54B39FFFE52F04
 #define idFC25566D624140559C54B39FFFE52F04
 
+#include "../variadic_repeat_bt.hpp"
 #include <type_traits>
 #include <stdexcept>
 #if !defined(INT_CONV_WITHOUT_HELPERS)
@@ -37,13 +38,16 @@ namespace dhandy {
 
 		using iterator = T*;
 		constexpr ReversedSizedArray() = default;
+		constexpr ReversedSizedArray (const ReversedSizedArray&) = default;
+		constexpr ReversedSizedArray (ReversedSizedArray&&) = default;
+		template <typename... Items> constexpr explicit ReversedSizedArray (Items&&... items);
 		~ReversedSizedArray() = default;
 
 		constexpr std::size_t size() const { return S - (m_curr + 1); }
 		constexpr bool empty() const { return m_curr + 1 == S; }
 		constexpr const T operator[] (std::size_t idx) const { if (idx >= size()) throw std::out_of_range("Out of bound array access"); return m_data[idx + m_curr + 1]; }
 		constexpr T& operator[] (std::size_t idx) { if (idx >= size()) throw std::out_of_range("Out of bound array access"); return m_data[idx + m_curr + 1]; }
-		constexpr void push_front (const T& itm) { if (size() == S) throw std::length_error("ReversedSizedArray is full"); m_data[m_curr--] = itm; }
+		constexpr void push_front (const T& itm) { /*if (size() == S) throw std::length_error("ReversedSizedArray is full");*/ m_data[m_curr--] = itm; }
 		constexpr const T* data() const { return m_data + m_curr + 1; }
 		constexpr const T* base_ptr() const { return m_data; }
 		constexpr iterator begin() { return m_data + m_curr + 1; }
@@ -67,6 +71,9 @@ namespace dhandy {
 #endif
 
 	private:
+		template <T... ItemsFill, typename... Items>
+		constexpr explicit ReversedSizedArray (bt::variadic_repeat<T, ItemsFill...>, Items&&... items);
+
 		T m_data[S];
 		std::size_t m_curr {S - 1};
 	};
@@ -78,6 +85,24 @@ namespace dhandy {
 		}
 	} //namespace implem
 
+	template <typename T, std::size_t S>
+	template <typename... Items>
+	inline constexpr ReversedSizedArray<T, S>::ReversedSizedArray (Items&&... items) :
+		ReversedSizedArray<T, S>(
+			bt::make_variadic_repeat<S - sizeof...(Items), T>{},
+			std::forward<Items>(items)...
+		)
+	{ }
+
+	template <typename T, std::size_t S>
+	template <T... ItemsFill, typename... Items>
+	constexpr ReversedSizedArray<T, S>::ReversedSizedArray (bt::variadic_repeat<T, ItemsFill...>, Items&&... items) :
+		m_data{ItemsFill..., std::forward<Items>(items)...},
+		m_curr(S - 1 - sizeof...(Items))
+	{
+		static_assert(sizeof...(ItemsFill) + sizeof...(Items) == S, "Wrong number of input elements");
+	}
+
 #if !defined(INT_CONV_WITHOUT_HELPERS)
 	template <typename T, std::size_t S>
 	inline

include/duckhandy/variadic_repeat_bt.hpp

@@ -0,0 +1,41 @@
+/* Copyright 2016-2024 Michele Santullo
+ * This file is part of "duckhandy".
+ *
+ * "duckhandy" is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * "duckhandy" is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with "duckhandy".  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <cstddef>
+
+namespace dhandy::bt {
+template <typename T, T... V>
+struct variadic_repeat {
+};
+
+namespace detail {
+	template <std::size_t N, typename T, T V0, T... V>
+	struct VariadicRepeatBuilder;
+
+	template <typename T, T V0, T... V>
+	struct VariadicRepeatBuilder<0, T, V0, V...> {
+		typedef variadic_repeat<T, V...> type;
+	};
+
+	template <std::size_t N, typename T, T V0, T... V>
+	struct VariadicRepeatBuilder : public VariadicRepeatBuilder<N-1, T, V0, V..., V0> {
+	};
+} //namespace detail
+
+template <std::size_t Count, typename T, T Val=T{}>
+using make_variadic_repeat = typename detail::VariadicRepeatBuilder<Count, T, Val>::type;
+} //namespace dhandy::bt