BigNumber.h

#ifndef TA14_BIGNUMBER_H
#define TA14_BIGNUMBER_H

#include <cstdint>
#include <string>
#include <regex>

class BigNumber {
    friend std::ostream &operator<<(std::ostream &output, const BigNumber &myBig);

    friend std::istream &operator>>(std::istream &input, BigNumber &myBig);

    friend BigNumber operator+(const BigNumber &num1, const BigNumber &num2);

    friend BigNumber operator-(const BigNumber &num1, const BigNumber &num2);

protected:
    unsigned numOfDigits;

    bool validate(const std::string &str, const std::string &pattern);

    unsigned numOfTrimCharsOnLeft(const std::string &str);

    BigNumber() {}

    int8_t &operator[](size_t index);


    //max(a, b)    a.max(b)

    bool sign;
    int8_t *numArray = nullptr;
public:
    //must be private
    static BigNumber unsignedMax(const BigNumber &num1, const BigNumber &num2);

    static BigNumber unsignedMin(const BigNumber &num1, const BigNumber &num2);

    static bool unsignedGreaterOrEqual(const BigNumber &num1, const BigNumber &num2);

    static bool unsignedLessOrEqual(const BigNumber &num1, const BigNumber &num2);

    static BigNumber unsignedAdd(const BigNumber &num1, const BigNumber &num2);

    static BigNumber unsignedSubtract(const BigNumber &num1, const BigNumber &num2);

    // end of private list

    BigNumber(const std::string &str);

    BigNumber(const char *myCharArray) : BigNumber((std::string) myCharArray) {}

    BigNumber(const long &intNum);

    BigNumber(const BigNumber &myBig);   // copy constructor
    BigNumber(BigNumber &&myBig) noexcept;  // move constructor
    ~BigNumber();

    void setValues(const std::string &str);

    bool getSign() const;

    void setSign(bool signNew);

    unsigned int getNumOfDigits() const;

    BigNumber &operator=(const BigNumber &rightNum);

    BigNumber &operator=(BigNumber &&rightNum) noexcept;   // move assignment overloading
    BigNumber operator-() const;

    int operator[](size_t index) const;

    bool operator==(const BigNumber &myBig) const;

    bool operator!=(const BigNumber &myBig) const;

    bool operator>=(const BigNumber &myBig) const;

    bool operator<=(const BigNumber &myBig) const;

    bool operator>(const BigNumber &myBig) const;

    bool operator<(const BigNumber &myBig) const;

    BigNumber absoluteValue() const;

    BigNumber operator>>(unsigned shift);

    BigNumber &operator--();

    BigNumber operator--(int);

    BigNumber &operator++();

    BigNumber operator++(int);

    BigNumber &operator+=(const BigNumber &num1);

    BigNumber &operator-=(const BigNumber &num1);

    virtual std::string to_string() const;


};


#endif //TA14_BIGNUMBER_H