backend_tests.py 文件源码

def test_cast_float(self):
        ffi = FFI(backend=self.Backend())
        a = ffi.cast("float", 12)
        assert float(a) == 12.0
        a = ffi.cast("float", 12.5)
        assert float(a) == 12.5
        a = ffi.cast("float", b"A")
        assert float(a) == ord("A")
        a = ffi.cast("int", 12.9)
        assert int(a) == 12
        a = ffi.cast("char", 66.9 + 256)
        assert ffi.string(a) == b"B"
        #
        a = ffi.cast("float", ffi.cast("int", 12))
        assert float(a) == 12.0
        a = ffi.cast("float", ffi.cast("double", 12.5))
        assert float(a) == 12.5
        a = ffi.cast("float", ffi.cast("char", b"A"))
        assert float(a) == ord("A")
        a = ffi.cast("int", ffi.cast("double", 12.9))
        assert int(a) == 12
        a = ffi.cast("char", ffi.cast("double", 66.9 + 256))
        assert ffi.string(a) == b"B"