【Duke】不安全编程 038 - PingPongGooo/GoFoundation GitHub Wiki

unsafe 使用场景， 外部c程序 ，交互时用到 unsafe

“不安全”行为的危险性

i := 10
f := *(*float64)(unsafe.Pointer(&i))

func TestUnsafe(t *testing.T)  {
	i := 10
	f := *(*float64)(unsafe.Pointer(&i))
	t.Log(unsafe.Pointer(&i))
	t.Log(f)
}

=== RUN   TestUnsafe
--- PASS: TestUnsafe (0.00s)
    flexible_reflect_test.go:88: 0xc00000a358
    flexible_reflect_test.go:89: 5e-323
PASS

type MyInt int

// 合理的类型转换
func TestConvert(t *testing.T){
	a := []int{1,2,3,4}
	b := *(*[]MyInt)(unsafe.Pointer(&a))
	t.Log(b)
}

=== RUN   TestConvert
--- PASS: TestConvert (0.00s)
    flexible_reflect_test.go:98: [1 2 3 4]
PASS