[swift-users] function advancedBy() bugs

[zh ao]

I just make a clearer example.

do {

    var str = "abcdefg"

    var str1 = str + "hijklmn"

    var range = str.startIndex..<str1.endIndex

    range.startIndex = range.startIndex.advancedBy(10)

    //fatal error: cannot increment endIndex

}


It seams that range.startIndex internally contains a fault
endIndex(str.endIndex, it should be its own endIndex, range.endIndex),
which leads the issue.


Zhaoxin

On Wed, May 18, 2016 at 12:02 AM, Dmitri Gribenko <gribozavr at gmail.com>
wrote:

> On Tue, May 17, 2016 at 5:46 AM, zh ao via swift-users
> <swift-users at swift.org> wrote:
> > It seams that I encountered bugs in function advancedBy().
> >
> > do {
> >     var str = "abcdefg"
> >     var range = str.startIndex..<str.endIndex // 0..<7
> >     str += "hijklmn"
> >     range.endIndex = str.endIndex // 0..<14
> >     let index = range.startIndex.advancedBy(10)
> >     //fatal error: cannot increment endIndex
> > }
>
> Hi,
>
> Thank you for the report.  To me, this issue looks the same as
> https://bugs.swift.org/browse/SR-1487.
>
> Dmitri
>
> --
> main(i,j){for(i=2;;i++){for(j=2;j<i;j++){if(!(i%j)){j=0;break;}}if
> (j){printf("%d\n",i);}}} /*Dmitri Gribenko <gribozavr at gmail.com>*/
>
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