您如何迭代一个函数产生的所有值？

I am new to go, and I have found myself writing a few for loops which look like this:

for element, err := producer.Produce(); err == nil; element, err = producer.Produce() {
    process(element)
}

where producer.Produce() is a function like reader.ReadString(' ') or fmt.Fscan(Reader, &token). I would much rather like to write

for element := range elements {
    process(element)
}

but for now, I would be satisfied to know if there is a cleaner way to iterate over the output of these kinds of functions in go. In particular, is there a nice way to get rid of this annoying duplication in the init statement and the post statement of the for statement?

I don't think there's anything quite as clean as what you're looking for. The idiomatic way to write it is:

for {
    element, err := producer.Produce()
    if err != nil {
        break
    }
    process(element)
}

Here's a way to create a channel from such a method:

elements := make(chan elementType)

val send func()
send = func() {
    if element, err := producer.Produce(); err == nil {
        elements <- element
        go send()
    } else {
      close(elements)
    }
}
go send()

for element := range elements {
    process(element)
}