//LABKA 2-4 v.1 Class
#pragma once

class Polynom {
private:
    struct Monom {
        double coef{ 0 };
        double pow{ 0 };
        Monom* next;
    };
    Monom* first{ nullptr };
public:
    Polynom() = default;
    Polynom(const Polynom&);
    Polynom(Polynom&&);
    Polynom& operator = (const Polynom&);
    Polynom& operator = (Polynom&&);
    Polynom& operator + (const Polynom&) const;
    Polynom& operator - (const Polynom&) const;
    Polynom& operator += (const Polynom&) const;
    ~Polynom();

    void in(std::istream&, std::string inputStreamType);
    void out(std::ostream&, std::string outputStreamType) const;

    void push(const Monom&);
    bool pop(Monom&);
    void dispose();

    class Iter {
    public:
        Iter() = default;
        Iter(Monom*);
        Monom& operator*();
        Iter& operator ++ (); // ++i
        Iter& operator ++ (int); // i++
        bool operator == (const Iter&);
        bool operator != (const Iter&);
    private:
        Monom* current{ nullptr };
    };
    Iter begin() const;
    Iter end() const;
};

void operator >>(std::istream& s, Polynom& p);
void operator <<(std::ostream& s, const Polynom& p);

void close(std::istream& s);
void close(std::ostream& s);