gistfile1.pyx

# case 1
if (some condition......):
    some code........
else:
    # THIS WORKS #
    # currently this only works for rangeOfString: method 
    f_type.size = 0
    f_type.alignment = 0
    f_type.type = FFI_TYPE_STRUCT
    f_type.elements = elements
    elements[0] = &ffi_type_uint64
    elements[1] = &ffi_type_uint64
    elements[2] = NULL

#########################################################

# case 2
    cdef void _resolve_complex_ffi_type(self):
        cdef: 
            ffi_type *f_type
            ffi_type **elements

        f_type = <ffi_type*>malloc(sizeof(ffi_type))
        elements = <ffi_type**>malloc(sizeof(ffi_type*) * 3)
        
        f_type.size = 0
        f_type.alignment = 0
        f_type.type = FFI_TYPE_STRUCT
        f_type.elements = elements
        elements[0] = &ffi_type_uint64
        elements[1] = &ffi_type_uint64
        elements[2] = NULL

        self.f_result_type = f_type

.
.
.
.


if (some condition......):
    some code........
else:
    # THIS DOES NOT WORK #
    self._resolve_complex_ffi_type()