how to reset directory iterator to the beginning of the folder

[masterinex]

i would like to reset the directory iterator to the beginning of the folder again , after it has reached end to compute the total file size of each extension in the current folder.

  

void scan2(path const& folder)
{
	cout << "\nScanning current folder:\n ";
	directory_iterator dir(folder);									   
	directory_iterator end;		


	
	while (dir != end)
	{
		//cout << dir->path();




         // algorithms and computations here 

	}

	++dir;
	}
	cout << endl;


	dir = folder.begin();


}

[JLBorges]

dir = directory_iterator(folder); // reset directory iterator to the beginning of the folder