How to use function pointers with fused types in Cython

func_ptr_fused.pyx

# Demo of how to use function pointers with fused types in Cython:

cimport cython

ctypedef fused fused_type:
    cython.double
    cython.longlong

cdef double func0(double x, double y):
    return x+y

cdef long long func1(long long x, long long y):
    return x+y

ctypedef fused_type (*FUNC)(fused_type x, fused_type y)

def foo(fused_type x, fused_type y):
    cdef FUNC f
    if fused_type == cython.double:
        print 'double'
        f = func0
    else:
        print 'long'
        f = func1
    return f(x, y)