banan-os/BAN/include/BAN/Iterators.h

#pragma once

#include <BAN/Assert.h>

namespace BAN
{

	template<typename T, typename Container>
	class IteratorSimple
	{
	public:
		IteratorSimple() = default;

		const T& operator*() const
		{
			ASSERT(m_pointer);
			return *m_pointer;
		}
		T& operator*()
		{
			ASSERT(m_pointer);
			return *m_pointer;
		}

		const T* operator->() const
		{
			ASSERT(m_pointer);
			return m_pointer;
		}
		T* operator->()
		{
			ASSERT(m_pointer);
			return m_pointer;
		}

		IteratorSimple& operator++()
		{
			ASSERT(m_pointer);
			++m_pointer;
			return *this;
		}
		IteratorSimple operator++(int)
		{
			auto temp = *this;
			++(*this);
			return temp;
		}

		IteratorSimple& operator--()
		{
			ASSERT(m_pointer);
			return --m_pointer;
		}
		IteratorSimple operator--(int)
		{
			auto temp = *this;
			--(*this);
			return temp;
		}

		bool operator==(const IteratorSimple& other) const
		{
			return m_pointer == other.m_pointer;
		}
		bool operator!=(const IteratorSimple& other) const
		{
			return !(*this == other);
		}

		operator bool() const
		{
			return m_pointer;
		}

	private:
		IteratorSimple(T* pointer)
			: m_pointer(pointer)
		{
		}

	private:
		T* m_pointer = nullptr;

		friend Container;
	};

	template<typename T, typename Container>
	class ConstIteratorSimple
	{
	public:
		ConstIteratorSimple() = default;
		ConstIteratorSimple(IteratorSimple<T, Container> other)
			: m_pointer(other.m_pointer)
		{
		}

		const T& operator*() const
		{
			ASSERT(m_pointer);
			return *m_pointer;
		}

		const T* operator->() const
		{
			ASSERT(m_pointer);
			return m_pointer;
		}

		ConstIteratorSimple& operator++()
		{
			ASSERT(m_pointer);
			++m_pointer;
			return *this;
		}
		ConstIteratorSimple operator++(int)
		{
			auto temp = *this;
			++(*this);
			return temp;
		}

		ConstIteratorSimple& operator--()
		{
			ASSERT(m_pointer);
			return --m_pointer;
		}
		ConstIteratorSimple operator--(int)
		{
			auto temp = *this;
			--(*this);
			return temp;
		}

		bool operator==(const ConstIteratorSimple& other) const
		{
			return m_pointer == other.m_pointer;
		}
		bool operator!=(const ConstIteratorSimple& other) const
		{
			return !(*this == other);
		}

		operator bool() const
		{
			return !!m_pointer;
		}

	private:
		ConstIteratorSimple(const T* pointer)
			: m_pointer(pointer)
		{
		}

	private:
		const T* m_pointer = nullptr;

		friend Container;
	};
}