Is it good to introduce owner transfer based string<->[]byte conversions?
After the conversion, the being converted string/[]byte values mustn't be
used any more.
Such as
tlsCertData, _ = ioutil.ReadFile("/etc/ssl/mycert")
var tlsCert string = bultin.ByteSlice2String(tlsCertData)
// forbid using tlsCertData any more
_ = tlsCertData // error: tlsCertData can only used after a re-assignment.
On Friday, September 11, 2020 at 3:09:57 PM UTC-4 Ian Lance Taylor wrote:
> On Fri, Sep 11, 2020 at 9:45 AM Kevin Chadwick <m8il...@gmail.com> wrote:
> >
> > I apologise if this has already been discussed. Google didn't turn up
> anything
> > directly related.
> >
> > If you read a file using the following that returns a byte slice.
> >
> > tlsCertb, err := ioutil.ReadFile("/etc/ssl/mycert")
> > if err != nil {
> > log.Fatal(err)
> > }
> > tlsCert = string(tlsCertb)
> >
> > Is there a way to get a string without the cast.
> >
> > Otherwise couldn't the language automatically return a string rather
> than a byte
> > slice in these cases if the receiving var is already a string?
> >
> > e.g.
> >
> > var string tlsCert
> > tlsCert, err = ioutil.ReadFile("/etc/ssl/mycert")
> > if err != nil {
> > log.Fatal(err)
> > }
>
> The way Go works, ioutil.ReadFile is compiled with the io/ioutil
> package. It can't change based on how it is called. So it is always
> going to return []byte.
>
> The only way to implement what you suggest would be to add an implicit
> conversion from []byte to string. But that seems problematic. In
> general Go avoids implicit conversions except to interface types. And
> a conversion to string does require a copy, so it doesn't seem like a
> great idea to do that implicitly.
>
> If this happens a lot in your code, it seems easy enough to use a tiny
> helper function.
>
> Ian
>
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