On Tuesday, September 4, 2018 at 11:49:23 AM UTC-5, rog wrote:
>
> selector goes away too. For example, the Stringer contract in the
> design doc purports to check that there's a method named String, which
> it does not - it could be a function-valued field instead.
>
>
In your example, you could replace fmt.Sprint(x) with x.String() to
avoid the problem.
>From my reading, you can use the following to force a 'func (t T)
String() string' method, but you'll need a separate contract for 'func
(t *T) String() string'.
contract stringer(x T) {
var _ string = T.String(x)
}
contract stringerp(x T) {
var _ string = (*T).String(&x)
}
You can also force a 'String func() string' field:
contract stringerField(x T) {
unsafe.Offsetof(x.String)
var _ string = x.String()
}
Unrelated, but more unsafe abuse allows another type of odd contract
as well:
contract FourBytesOrLarger(x T) {
var _ [unsafe.Sizeof(*(*T)(nil))-4]int
}
I don't think any of the above is a good idea, and the original
stringer contract probably does what you want it to 99% of the time.
- Todd
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