Casting the exception return code raises compile error

[Venkat Raghav Rajagopalan (Raghav RV)]

Hi,

I am trying to allow NULL as an except error code (return value is a better term for this?) for a function whose return type is pointer to one of the fused types (decided based on the input). I'm unable to find a nice solution "other than except *" whose overhead is pretty significant especially when the function is being called multiple times...

A fully contained sample cython snippet would be -

%%cython

ctypedef fused realloc_ptr:
    (unsigned char*)
    (size_t*)
    
cdef realloc_ptr safe_realloc(realloc_ptr* p) nogil except (<realloc_ptr> NULL):
    with gil:
        raise MemoryError("I ain't gonna work...")
    return NULL


cpdef fn():
    cdef size_t* a
    safe_realloc(&a)
    
fn()

Thanks!