From 1a6aea9ca3095203891631dce6df29ba515b212b Mon Sep 17 00:00:00 2001
From: cyborg1811m <patrick@maschek.info>
Date: Fri, 19 Jan 2024 22:46:24 +0100
Subject: [PATCH] added outline for const_list

---
 CMakeLists.txt       |   3 +-
 include/const_list.h | 102 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 104 insertions(+), 1 deletion(-)
 create mode 100644 include/const_list.h

diff --git a/CMakeLists.txt b/CMakeLists.txt
index ba1b8a5..20921a2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,7 +4,8 @@ project(const_container)
 set(CMAKE_CXX_STANDARD 20)
 
 add_library(const_container INTERFACE "${CMAKE_CURRENT_LIST_DIR}/include/const_vector.hpp"
-        include/helper.h)
+        "${CMAKE_CURRENT_LIST_DIR}/include/helper.h"
+        "${CMAKE_CURRENT_LIST_DIR}/include/const_list.h")
 target_include_directories(const_container INTERFACE "${CMAKE_CURRENT_LIST_DIR}/include")
 
 add_executable(const_container_test test/test_main.cpp)
diff --git a/include/const_list.h b/include/const_list.h
new file mode 100644
index 0000000..9e371d0
--- /dev/null
+++ b/include/const_list.h
@@ -0,0 +1,102 @@
+//
+// Created by Patrick Maschek on 19.01.2024.
+//
+
+#ifndef UDIFF_CONST_LIST_H_
+#define UDIFF_CONST_LIST_H_
+
+#include <concepts>
+#include <iterator>
+
+namespace cc {
+	
+	class const_list_node;
+	
+	template<typename N>
+	requires std::derived_from<N, const_list_node>
+	class _const_list_iterator_base {
+		protected:
+			N *_curr;
+
+		public:
+			constexpr _const_list_iterator_base() : _curr() {}
+			constexpr explicit _const_list_iterator_base(N *curr) : _curr(curr) {}
+
+			constexpr virtual const N& operator*() const { return *_curr; }
+			constexpr virtual const N* operator->() const { return _curr; }
+
+			constexpr virtual _const_list_iterator_base &operator++() noexcept = 0;
+			constexpr virtual _const_list_iterator_base &operator--() noexcept = 0;
+			constexpr virtual _const_list_iterator_base operator++(int) & noexcept = 0;
+			constexpr virtual _const_list_iterator_base operator--(int) & noexcept = 0;
+
+			constexpr bool operator==(const _const_list_iterator_base &other) { return _curr == other._curr; }
+	};
+
+	template<typename N>
+	class _const_list_iterator : public _const_list_iterator_base<N> {
+			using _Base = _const_list_iterator_base<N>;
+		public:
+			constexpr _const_list_iterator() : _Base() {}
+			constexpr explicit _const_list_iterator(N *curr) : _Base(curr) {}
+
+			constexpr N& operator*() const override { return *_Base::_curr; }
+			constexpr N* operator->() const override { return _Base::_curr; }
+
+			constexpr _const_list_iterator &operator++() noexcept override { _Base::_curr == _Base::_curr->_next; return *this; }
+			constexpr _const_list_iterator &operator--() noexcept override { _Base::_curr == _Base::_curr->_prev; return *this; }
+			constexpr _const_list_iterator operator++(int) & noexcept override { auto tmp = *this; _Base::_curr == _Base::_curr->_next; return tmp; }
+			constexpr _const_list_iterator operator--(int) & noexcept override { auto tmp = *this; _Base::_curr == _Base::_curr->_prev; return tmp; }
+	};
+
+	template<typename N>
+	class _const_const_list_iterator : public _const_list_iterator_base<N> {
+			using _Base = _const_list_iterator_base<N>;
+		public:
+			constexpr _const_const_list_iterator() : _Base() {}
+			constexpr explicit _const_const_list_iterator(N *curr) : _Base(curr) {}
+
+			constexpr _const_const_list_iterator &operator++() noexcept override { _Base::_curr == _Base::_curr->_next; return *this; }
+			constexpr _const_const_list_iterator &operator--() noexcept override { _Base::_curr == _Base::_curr->_prev; return *this; }
+			constexpr _const_const_list_iterator operator++(int) & noexcept override { auto tmp = *this; _Base::_curr == _Base::_curr->_next; return tmp; }
+			constexpr _const_const_list_iterator operator--(int) & noexcept override { auto tmp = *this; _Base::_curr == _Base::_curr->_prev; return tmp; }
+	};
+	
+	template<typename N>
+	requires std::derived_from<N, const_list_node>
+	class const_list {
+
+		public:
+			
+			using value_type = N;
+			using size_type = std::size_t;
+			using difference_type = std::ptrdiff_t;
+			using reference = value_type&;
+			using const_reference = const value_type&;
+			using pointer = value_type *;
+			using const_pointer = const value_type *;
+			using iterator = _const_list_iterator<N>;
+			using const_iterator = _const_const_list_iterator<N>;
+			using reverse_iterator = std::reverse_iterator<iterator>;
+			using const_reverse_iterator = std::reverse_iterator<const_iterator>;
+			
+			
+		private:
+			const_list_node *_start;
+			
+	};
+
+	class const_list_node {
+		private:
+			const_list_node *_prev;
+			const_list_node *_next;
+
+			friend class const_list<const_list_node>;
+			friend class _const_list_iterator_base<const_list_node>;
+	};
+	
+	
+
+} // cc
+
+#endif //UDIFF_CONST_LIST_H_