tape.hpp

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#ifndef TAPE_HPP
#define TAPE_HPP
 
#include "direction.hpp"
#include "string.hpp"
#include "symbol.hpp"
 
#include <iostream>
#include <map>
#include <ostream>
 
class Tape
{
  public:
    Tape() noexcept : head_pos_(0) {}
 
    explicit Tape(String str) noexcept(false);
 
    [[nodiscard]] Symbol read() const noexcept;
 
    void write(Symbol symbol) noexcept(false) { this->cells_[this->head_pos_] = symbol; }
 
    void move(Direction dir) noexcept
    {
        switch (dir)
        {
            case Direction::LEFT:
                --this->head_pos_;
                break;
            case Direction::RIGHT:
                ++this->head_pos_;
                break;
            case Direction::STAY:
            default:
                break;
        }
    }
 
    void print(std::ostream &os = std::cout) const noexcept;
 
    friend std::ostream &operator<<(std::ostream &os, const Tape &tape) noexcept;
 
  private:
    int head_pos_;                
    std::map<int, Symbol> cells_; 
};
 
#endif // TAPE_HPP