您可以解释func关键字和函数名称之间的参数吗？

Question

I'm new to the language and so far what I have read doesn't explain what is happening here.

I was looking at JSON decoding.

Here is a function in the package:

func (dec *Decoder) Decode(v interface{}) error

There is similar notation here:

func (dec *Decoder) Buffered() io.Reader

How do these functions access the (dec *Decoder)? Given that the second function has no parameters, I am guessing this is not something that must be passed directly in the function call but something similar?

Answer 1

These two functions are methods because they are associated with receivers. In each method declaration, (dec *Decoder) describes the receiver. If you have a *Decoder called decoder, you call Buffered on it like this:

reader := decoder.Buffered()

Take a look at the the Go tutorial lesson on this topic.