英文:
Go - operator overloading
问题
我已经开始学习Go，并且正在尝试理解下面的代码：
time.Sleep(1000 * time.Millisecond) // 正常工作
time.Sleep("1000ms") // 不工作
如果你将 time.Milliseconds 打印到控制台，你会看到 1ms。所以我认为我可以简单地使用值 "1000ms" 调用该方法，但是我得到了一个错误。接下来，我搜索了Go中的运算符重载，但是它不支持。我理解 time.Sleep 接受 time.Milliseconds 数据类型，但是如果Go不支持像 * 这样的运算符重载，它是如何实现的呢？
英文:
I have started to study Go and I am trying to understand what happens below:
<!-- language: lang-go -->
time.Sleep(1000 * time.Millisecond) // Works
time.Sleep("1000ms") // Doesn't work
<!-- end snippet -->
If you print to the console time.Milliseconds you can see 1ms. So I think that I can simply call that method with the value "1000ms", but I get an error. Next I searched for operator overloading in Go, but it doesn't support it. I understand that time.Sleep gets the time.Milliseconds data type, but how does Go allow it if it doesn't support overloading operators like *?
答案1
得分: 5
Sleep()接受一个Duration类型的参数，该类型是int64。因此，如果不将字符串类型的对象进行类型转换，你无法将其作为参数传递。
你之所以得到输出1ms，是因为使用了以下方法：
(time.Duration) String() string
英文:
Sleep() accept a Duration type which is int64. So you can't pass string type object as an argument without typecasting it.
You got the output 1ms because of this method
(time.Duration) String() string
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