#include <fwd.hh>
This canvas browse all the points of an image 'input' of type 'I' from left to right and from top to bottom
The fonctor should provide (In addition of 'I' and 'input') three methods :
F shall feature:
{
--- as typedef:
I;
--as attributes:
input;
p;
--- as method:
void init();
void next();
void final();
}