number.hpp

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 * Copyright (c) 2023-2025 NWSOFT                                                                 *
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#pragma once
 
#include "rounding.hpp"
#include "testing.hpp"
#include "types/rounding.hpp"
#include "util.hpp"
 
#include <functional>
#include <string>
#include <utility>

namespace steppable
{
    class Number
    {
        std::string value;

        size_t prec;

        RoundingMode mode = RoundingMode::USE_CURRENT_PREC;
 
        template<__internals::utils::StringLiteral fnName>
        [[nodiscard]] size_t determinePrec(const Number& rhs) const
        {
            size_t usePrec = 0;
            if (mode == RoundingMode::USE_MAXIMUM_PREC)
                usePrec = std::max(prec, rhs.prec);
            else if (mode == RoundingMode::USE_MINIMUM_PREC)
                usePrec = std::min(prec, rhs.prec);
            else if (mode == RoundingMode::USE_CURRENT_PREC)
                usePrec = prec;
            else if (mode == RoundingMode::USE_OTHER_PREC)
                usePrec = rhs.prec;
            else if (mode == RoundingMode::DISCARD_ALL_DECIMALS)
                usePrec = 0;
            else
            {
                usePrec = 0;
                output::warning(std::string(fnName.value), "Invalid precision specified"s);
            }
 
            return usePrec;
        }
 
    public:
        Number(std::string value = "0", size_t prec = 10, RoundingMode mode = RoundingMode::USE_CURRENT_PREC);

        template<concepts::Numeric ValueT>
        Number(ValueT value, size_t prec = 10, RoundingMode mode = RoundingMode::USE_CURRENT_PREC) :
            value(std::to_string(value)), prec(prec), mode(mode)
        {
        }
 
        void set(std::string newVal) { value = std::move(newVal); }
 
        void setPrec(size_t newPrec, RoundingMode mode = RoundingMode::USE_CURRENT_PREC)
        {
            this->mode = mode;
            prec = newPrec;
            value = __internals::numUtils::roundOff(value, prec);
        }

        Number operator+(const Number& rhs) const;

        Number operator-(const Number& rhs) const;

        Number operator*(const Number& rhs) const;

        Number operator/(const Number& rhs) const;

        [[nodiscard]] Number mod(const Number& rhs) const;

        Number operator%(const Number& rhs) const;

        Number operator^(const Number& rhs);

        Number& operator+=(const Number& rhs);

        Number& operator-=(const Number& rhs);

        Number& operator*=(const Number& rhs);

        Number& operator/=(const Number& rhs);

        Number& operator%=(const Number& rhs);

        Number& operator^=(const Number& rhs);

        bool operator==(const Number& rhs) const;

        bool operator!=(const Number& rhs) const;

        bool operator<(const Number& rhs) const;

        bool operator>(const Number& rhs) const;

        bool operator<=(const Number& rhs) const;

        bool operator>=(const Number& rhs) const;

        Number operator++();

        Number operator--();

        Number operator-() const;

        Number operator+() const;

        [[nodiscard]] std::string present() const;

        [[nodiscard]] Number abs() const
        {
            if (*this > 0)
                return *this;
            return -(*this);
        }
    };

    namespace literals
    {
        inline Number operator""_n(long double value) { return Number(value); }
 
        inline Number operator""_n(unsigned long long value) { return Number(value); }
    } // namespace literals
} // namespace steppable
 
template<>
struct std::hash<steppable::Number>
{
    size_t operator()(const steppable::Number& n) const { return hash<std::string>()(n.present()); }
};
 
std::ostream& operator<<(std::ostream& os, const steppable::Number& number);