Fri, 29 Apr 2011 11:30:19 +0200, mark florisson wrote:
> On 29 April 2011 11:03, Pauli Virtanen <p...@iki.fi> wrote:
[clip]
>> Are you planning to special-case the "real_t complex" syntax? Shooting
>> from the sidelines, one more generic solution might be, e.g.,
>
> I'm sorry, I'm not sure what syntax you are referring to. Are you
> talking about actual complex numbers?
This:
On 28 April 2011 23:30, Robert Bradshaw <rober...@math.washington.edu>
wrote:
> OK, I take back what I said, I was looking at the RHS, not the LHS. If
> one needs to specialize in this manner, explicitly creating two
> branches should typically be enough. The same for casting. The one
> exception (perhaps) is "my_fused_type complex." Otherwise it's
> starting to feel too much like C++ template magic and complexity for
> little additional benefit.
That is, declaring a complex type matching a real one.
>> ctypedef cython.fused_type(A, B) struct_t
>> ctypedef cython.fused_type(float, double, paired=struct_t) real_t
>> ctypedef cython.fused_type(int_t, string_t, paired=struct_t) var_t
>>
>> and just restrict the specialization to cases that make sense.
>
> The paired means you're declaring types of attributes?
No, just that real_t is specialized to float whenever struct_t is specialized
to A and to double when B. Or a more realistic example,
ctypedef cython.fused_type(float, double) real_t
ctypedef cython.fused_type(float complex, double complex) complex_t
cdef real_plus_one(complex_t a):
real_t b = a.real
return b + 1
which I suppose would not be a very unusual thing in numerical codes.
This would also allow writing the case you had earlier as
cdef cython.fused_type(string_t, int, paired=struct_t) attr_t
cdef func(struct_t mystruct, int i):
cdef attr_t var
if typeof(mystruct) is typeof(int):
var = mystruct.attrib + i
...
else:
var = mystruct.attrib + i
...
Things would need to be done explicitly instead of implicitly, though,
but it would remove the need for any special handling of
the "complex" keyword.
--
Pauli Virtanen
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