cursor_ptr.h

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/*
Copyright (c) 2026 MrXie1109
 
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
 
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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SOFTWARE.
*/
 
#pragma once
#include <cstddef>
 
namespace console
{
    template <class T>
    class cursor_ptr
    {
        T *original_ptr; 
        T *current_ptr;  
 
    public:
        cursor_ptr() : original_ptr(nullptr), current_ptr(nullptr) {}

        cursor_ptr(T *p) : original_ptr(p), current_ptr(p) {}

        cursor_ptr(const cursor_ptr &cp)
            : original_ptr(nullptr), current_ptr(cp.current_ptr) {}

        cursor_ptr(cursor_ptr &&cp)
            : original_ptr(cp.original_ptr), current_ptr(cp.current_ptr)
        {
            cp.original_ptr = nullptr;
        }

        T &operator*() { return *current_ptr; }
        T *operator->() { return current_ptr; }
        T &operator[](size_t i) { return *(current_ptr + i); }
        T *get() { return current_ptr; }
        operator T *() { return current_ptr; }

        const T &operator*() const { return *current_ptr; }
        const T *operator->() const { return current_ptr; }
        const T &operator[](size_t i) const { return *(current_ptr + i); }
        const T *get() const { return current_ptr; }
        operator const T *() const { return current_ptr; }

        ~cursor_ptr() { delete original_ptr; }

        cursor_ptr &operator++()
        {
            ++current_ptr;
            return *this;
        }
        cursor_ptr operator++(int)
        {
            cursor_ptr tmp(*this);
            ++current_ptr;
            return tmp;
        }
        cursor_ptr &operator--()
        {
            --current_ptr;
            return *this;
        }
        cursor_ptr operator--(int)
        {
            cursor_ptr tmp(*this);
            --current_ptr;
            return tmp;
        }


        cursor_ptr operator+(int sep) const
        {
            cursor_ptr cp;
            cp.current_ptr = current_ptr + sep;
            return cp;
        }
        cursor_ptr operator-(int sep) const
        {
            cursor_ptr cp;
            cp.current_ptr = current_ptr - sep;
            return cp;
        }
        const cursor_ptr &operator+=(int sep)
        {
            current_ptr += sep;
            return *this;
        }
        const cursor_ptr &operator-=(int sep)
        {
            current_ptr -= sep;
            return *this;
        }
        int operator-(const cursor_ptr &cp) const
        {
            return current_ptr - cp.current_ptr;
        }


        bool operator==(const cursor_ptr &cp) const
        {
            return current_ptr == cp.current_ptr;
        }
        bool operator==(const T *p) const
        {
            return current_ptr == p;
        }
        friend bool operator==(const T *p, const cursor_ptr &cp)
        {
            return cp == p;
        }
        bool operator!=(const cursor_ptr &cp) const
        {
            return current_ptr != cp.current_ptr;
        }
        bool operator!=(const T *p) const
        {
            return current_ptr != p;
        }
        friend bool operator!=(const T *p, const cursor_ptr &cp)
        {
            return cp != p;
        }



        const cursor_ptr &operator=(T *p)
        {
            if (original_ptr == p)
                return *this;
            delete original_ptr;
            original_ptr = p;
            current_ptr = p;
            return *this;
        }

        const cursor_ptr &operator=(const cursor_ptr &cp)
        {
            if (this == &cp)
                return *this;
            delete original_ptr;
            original_ptr = nullptr;
            current_ptr = cp.current_ptr;
            return *this;
        }

        const cursor_ptr &operator=(cursor_ptr &&cp)
        {
            if (this == &cp)
                return *this;
            delete original_ptr;
            current_ptr = cp.current_ptr;
            original_ptr = cp.original_ptr;
            cp.original_ptr = nullptr;
            return *this;
        }


        void swap(cursor_ptr &cp)
        {
            T *p1 = current_ptr, *p2 = original_ptr;
            current_ptr = cp.current_ptr;
            original_ptr = cp.original_ptr;
            cp.current_ptr = p1;
            cp.original_ptr = p2;
        }
    };

    template <class T>
    class cursor_ptr<T[]>
    {
        T *original_ptr;
        T *current_ptr;
 
    public:
        cursor_ptr() : original_ptr(nullptr), current_ptr(nullptr) {}

        cursor_ptr(T *p) : original_ptr(p), current_ptr(p) {}

        cursor_ptr(const cursor_ptr &cp)
            : original_ptr(nullptr), current_ptr(cp.current_ptr) {}

        cursor_ptr(cursor_ptr &&cp)
            : original_ptr(cp.original_ptr), current_ptr(cp.current_ptr)
        {
            cp.original_ptr = nullptr;
        }

        T &operator*() { return *current_ptr; }
        T *operator->() { return current_ptr; }
        T &operator[](size_t i) { return *(current_ptr + i); }
        T *get() { return current_ptr; }
        operator T *() { return current_ptr; }

        const T &operator*() const { return *current_ptr; }
        const T *operator->() const { return current_ptr; }
        const T &operator[](size_t i) const { return *(current_ptr + i); }
        const T *get() const { return current_ptr; }
        operator const T *() const { return current_ptr; }

        ~cursor_ptr() { delete[] original_ptr; }

        cursor_ptr &operator++()
        {
            ++current_ptr;
            return *this;
        }
        cursor_ptr operator++(int)
        {
            cursor_ptr tmp(*this);
            ++current_ptr;
            return tmp;
        }
        cursor_ptr &operator--()
        {
            --current_ptr;
            return *this;
        }
        cursor_ptr operator--(int)
        {
            cursor_ptr tmp(*this);
            --current_ptr;
            return tmp;
        }


        cursor_ptr operator+(int sep) const
        {
            cursor_ptr cp;
            cp.current_ptr = current_ptr + sep;
            return cp;
        }
        cursor_ptr operator-(int sep) const
        {
            cursor_ptr cp;
            cp.current_ptr = current_ptr - sep;
            return cp;
        }
        const cursor_ptr &operator+=(int sep)
        {
            current_ptr += sep;
            return *this;
        }
        const cursor_ptr &operator-=(int sep)
        {
            current_ptr -= sep;
            return *this;
        }
        int operator-(const cursor_ptr &cp) const
        {
            return current_ptr - cp.current_ptr;
        }


        bool operator==(const cursor_ptr &cp) const
        {
            return current_ptr == cp.current_ptr;
        }
        bool operator==(const T *p) const
        {
            return current_ptr == p;
        }
        friend bool operator==(const T *p, const cursor_ptr &cp)
        {
            return cp == p;
        }
        bool operator!=(const cursor_ptr &cp) const
        {
            return current_ptr != cp.current_ptr;
        }
        bool operator!=(const T *p) const
        {
            return current_ptr != p;
        }
        friend bool operator!=(const T *p, const cursor_ptr &cp)
        {
            return cp != p;
        }


        const cursor_ptr &operator=(T *p)
        {
            if (original_ptr == p)
                return *this;
            delete[] original_ptr;
            original_ptr = p;
            current_ptr = p;
            return *this;
        }
        const cursor_ptr &operator=(const cursor_ptr &cp)
        {
            if (this == &cp)
                return *this;
            delete[] original_ptr;
            original_ptr = nullptr;
            current_ptr = cp.current_ptr;
            return *this;
        }
        const cursor_ptr &operator=(cursor_ptr &&cp)
        {
            if (this == &cp)
                return *this;
            delete[] original_ptr;
            current_ptr = cp.current_ptr;
            original_ptr = cp.original_ptr;
            cp.original_ptr = nullptr;
            return *this;
        }


        void swap(cursor_ptr &cp)
        {
            T *p1 = current_ptr, *p2 = original_ptr;
            current_ptr = cp.current_ptr;
            original_ptr = cp.original_ptr;
            cp.current_ptr = p1;
            cp.original_ptr = p2;
        }
    };
}