On Saturday 23 January 2010 14:53:14 Garth N. Wells wrote: > Johan Hake wrote: > > On Saturday 23 January 2010 06:00:32 Garth N. Wells wrote: > >> In C++, we can treat a Constant as a double, e.g. > >> > >> Constant dt(0.1) > >> double t = 0.0l > >> t += dt > >> > >> but this doesn't work in Python. Is there an elegant was to do this? Or > >> is it just a case of defining __add__, etc in constant.py? > > > > No, as you are not adding something to Constant ;) > > > > But we might want to rename the double() operator in cpp.Constant to > > __float__(self) in the SWIG interface, so one can do the above.
It turned out that we already have this. However it does not kick in because the ufl.Coefficient implements __radd__, which get called and t becomes an ufl.Coefficient. Quite weird if you ask me. Not sure we want to remove the __radd__ method from ufl. A quick fix would be to: t += float(dt) which invokes the wrapped double operator. Another example where C++ is simpler than Python. Johan _______________________________________________ Mailing list: https://launchpad.net/~dolfin Post to : [email protected] Unsubscribe : https://launchpad.net/~dolfin More help : https://help.launchpad.net/ListHelp
