It creates a new slice header, but the backing array is not copied.
On Thu, Jan 18, 2018 at 3:35 PM Peng Yu <pengyu...@gmail.com> wrote:
> Dan & Bruno,
>
> I didn't realize that it is as simple as that :) Thanks.
>
> Does it involve any extra copy of the byte slice? Or f.Write literally
> access the memory of d and only access 2 bytes of data for writing to
> the buffer?
>
> On Thu, Jan 18, 2018 at 5:13 PM, Dan Kortschak
> <dan.kortsc...@adelaide.edu.au> wrote:
> > If you want to write a length shorter than the slice, make the slice
> > shorter. No, seriously...
> >
> > n, err := f.Write(d[:2])
> >
> > On Thu, 2018-01-18 at 17:04 -0600, Peng Yu wrote:
> >> Hi,
> >>
> >> The following example shows how to write a byte slice to a buffer.
> >> But
> >> what if I want only write a length shorter (say 2 instead of 5) than
> >> the size of the slice. Is there a function that allows users to
> >> specify the length to write? Thanks.
> >>
> >> $ cat main.go
> >> #!/usr/bin/env gorun
> >> // vim: set noexpandtab tabstop=2:
> >> package main
> >>
> >> import (
> >> "os"
> >> "bufio"
> >> "fmt"
> >> )
> >>
> >> func main() {
> >> f := bufio.NewWriter(os.Stdout)
> >> d := []byte{'s', 'o', 'm', 'e', '\n'}
> >> n, err := f.Write(d)
> >> f.Flush()
> >> fmt.Printf("wrote %d bytes, error %q\n", n, err)
> >> }
> >>
> >> --
> >> Regards,
> >> Peng
> >>
>
>
>
> --
> Regards,
> Peng
>
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