cdef union double_op_params:
void* func
double c
int n
cdef struct fast_double_op:
char type
double_op_params params
cdef class FastDoubleFunc:
cdef readonly int max_height
cdef readonly int nargs
cdef readonly int nops
cdef fast_double_op* ops
cdef double* argv
cdef double* stack
# need to keep this around because structs can't contain (ref-counted) python objects
cdef py_funcs
cdef int allocate_stack(FastDoubleFunc self) except -1
cdef double _call_c(FastDoubleFunc self, double* argv) except? -2
cpdef bint is_pure_c(self)
cdef FastDoubleFunc cfunc(FastDoubleFunc self, void* func)
cdef FastDoubleFunc unop(FastDoubleFunc self, char type)
