check out this doc:
http://www.python.org/doc/2.5.2/ref/numeric-types.html
[] __getitem__
() __call__
>> __rshift__
<< __lshift__
the only thing from this list that i see you cannot do is overload the
equal (=).
you can't overload foo = 'bar', but you can overload foo.spangle =
'bar' using __setattr__.
the pythonic way of doing ``foo='bar'`` is ``foo = Foo('bar')``, in
which case you handle your logic in __new__ or __init__ of Foo.
-chad
On Feb 10, 2009, at 9:59 AM, ryant wrote:
>
> I am converting a C++ plugin to Python and I ran into several operator
> overloading functions. I understand how they work in C++ but what is
> the best way to mimic them in python. My only thought right now is to
> write a Python definition like this, which means I need to find every
> operator in the file and make it use a function instead.
>
> def addStuff(self, a, b):
> c = a + b
> return c
>
>
> Here are the C++ functions:
>
>
> double* MatrixNN::operator[](unsigned i)
> {
> double *ptr = ptrDbl + (i*uDimension) ;
> return ptr ;
> }
>
> const double* MatrixNN::operator[](unsigned i) const
> {
> double *ptr = ptrDbl + (i*uDimension) ;
> return ptr ;
> }
>
> double& MatrixNN::operator()(unsigned i, unsigned j)
> {
> unsigned idx = getIndex(i, j) ;
> return (ptrDbl[idx]) ;
> }
>
> double MatrixNN::operator()(unsigned i, unsigned j) const
> {
> unsigned idx = (i*uDimension) + j ;
> return (ptrDbl[idx]) ;
> }
>
> ostream& operator<<(ostream &os, const MatrixNN &matNN)
> {
> os << "MatrixNN " << matNN.uDimension << "x" << matNN.uDimension <<
> endl ;
> if (matNN.uDimension > 0 && matNN.ptrDbl != NULL)
> {
> unsigned i,j;
> for (i=0; i < matNN.uDimension; ++i)
> {
> os << "ROW_" << i << "= " ;
> for (j=0; j < matNN.uDimension; ++j)
> {
> os << matNN[i][j] << " " ;
> }
> os << endl ;
> }
> }
> return os ;
> }
>
> MatrixNN& MatrixNN::operator=(const MatrixNN &matNN)
> {
> setDimension( matNN.uDimension );
>
> unsigned u;
> unsigned uTotal = uDimension * uDimension ;
> for (u=0; u < uTotal; ++u)
> ptrDbl[u] = matNN.ptrDbl[u] ;
>
> return (*this) ;
> }
> >
--~--~---------~--~----~------------~-------~--~----~
Yours,
Maya-Python Club Team.
-~----------~----~----~----~------~----~------~--~---
