On 06/02/2011 06:39 PM, Robert Bradshaw wrote:
In looking at merging fused types, it's time to nail down the syntax. The current implementation is
ctypedef cython.fused_type(list, dict, object) fused_t
This requires an addition to the grammer to allow the "call" syntax in a type declaration, as well as special casing to make it allowed only in a typedef. What about
cython.fused_type[list, dict, object].
One advantage is that indexing is already valid in type declarations, and its the typical syntax for parameterized types. Thoughts? Any other ideas?
I don't really like overloading [] even more, and I think () (or, perhaps, 'fused_type([list, dict, object])'). But I don't feel very strongly about it. If you only want this allowed in typedefs, then, being puristic, I think that really a "fused type" is really different from a ctypedef, and that it would warrant something like a new keyword. cdef fusedtype [list, dict, object] fused_t That's rather horrible, but you get the gist. The thing is, once you use a ctypeudef, you really should allow def f(fused_type(float, double) x, fused_type(float, double) y): ... but then, how many fused types do you have, one or two? So this makes it seem to me that using ctypedef is a rather horrible hack. But, like I said, I don't feel strongly about this.
P.S. Anyone remember buffers and C++ templated types are dissallowed as typedefs?
As for buffers I just think I never got around to it... Dag Sverre