#include <fcl/string.hh>
#include <fcl/boolean.hh>
#include <bintree.hh>

class SimpleList
{
public:
    // Constructor
    SimpleList(string str, SimpleList* nxt);  

    //Destructor
    ~SimpleList();

    //Enquirer
    bool ok(char ch);

    // Accessors
    void read(string s);
    string write() const;
    void print() const;
    void next(SimpleList* ptr);
    SimpleList* nxt();

    // Arithmetic operations (destructive)
    longint hashnumber();

    //Auxiliaries
    void clean();
    int hangon(char ch);

private:
    string str_;
    SimpleList* nxt_;
    int len_;
};