REG file parser using the Boost Spirit Parser Framework

#ifndef __STATUS_OBSERVER_H_INCLUDED__
#define __STATUS_OBSERVER_H_INCLUDED__

#include "IRegFileObserver.hpp"
#include <string>

namespace reg_parser
{

template<class charT,class streamT>
class CRegStatusObserver:public IRegFileObserver<charT>
{
    size_t bufferStart_;
    size_t bufferSize_;
    size_t previousStatus_;

	streamT& out_;
public:
    CRegStatusObserver(size_t bufferStart,
					   size_t bufferSize,
					   streamT& out)
        : bufferStart_(bufferStart)
		, bufferSize_(bufferSize)
		, previousStatus_(0)
		, out_(out)
    {}
	
    void OnKeyFound(const charT* begin, const charT* end)
    {
        UpdateStatus((size_t)end);
    }

    void OnValueFound(const charT* nameBegin, const charT* nameEnd,
                      const charT* dataBegin, const charT* dataEnd)
    {
        UpdateStatus((size_t)dataEnd);
    }
private:
    void UpdateStatus(size_t end)
    {
        float percent = (float)((size_t)end - bufferStart_)/bufferSize_;
        size_t status = (size_t)percent*100;
        if( (previousStatus_) < status )
        {
            previousStatus_ = status;
            out_ << "\r     " << "\r" << status << "%"; 
        }
    }
};

}//namespace reg_parser

#endif // __STATUS_OBSERVER_H_INCLUDED__