test_ffi_obj.py 文件源码

def test_ffi_type_not_immortal():
    import weakref, gc
    ffi = _cffi1_backend.FFI()
    t1 = ffi.typeof("int **")
    t2 = ffi.typeof("int *")
    w1 = weakref.ref(t1)
    w2 = weakref.ref(t2)
    del t1, ffi
    gc.collect()
    assert w1() is None
    assert w2() is t2
    ffi = _cffi1_backend.FFI()
    assert ffi.typeof(ffi.new("int **")[0]) is t2
    #
    ffi = _cffi1_backend.FFI()
    t1 = ffi.typeof("int ***")
    t2 = ffi.typeof("int **")
    w1 = weakref.ref(t1)
    w2 = weakref.ref(t2)
    del t2, ffi
    gc.collect()
    assert w1() is t1
    assert w2() is not None   # kept alive by t1
    ffi = _cffi1_backend.FFI()
    assert ffi.typeof("int * *") is t1.item