#pragma once
#include <string>
#include <functional>

class DirWalk
{
public:
    DirWalk(const std::string& DirName);
    ~DirWalk();
    // noncopyable, nonmovable.
    DirWalk(const DirWalk&) = delete;
    DirWalk& operator = (const DirWalk&) = delete;
    DirWalk(DirWalk&&) = delete;
    DirWalk& operator = (DirWalk&&) = delete;
    
    bool isReady() const;
    int next(std::string& name, bool& is_dir);
    std::string getroot() const;
private:
    struct _impl;
    _impl* _p;
};