• d-bugmail puremagic.com May 10 2008
• d-bugmail puremagic.com May 10 2008
• "Jarrett Billingsley" <kb3ctd2 yahoo.com> May 10 2008

http://d.puremagic.com/issues/show_bug.cgi?id=2093

           Summary: string concatenation modifies original
           Product: D
           Version: 2.014
          Platform: PC
        OS/Version: Windows
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: bugzilla digitalmars.com
        ReportedBy: bartosz relisoft.com


I will attach source code for this example. It's an XML parser. It should
produce the following output:
c:\D\Work>xml
root
    child
     color=red

         Text=foo bar baz
Instead it produces this:
c:\D\Work>xml
root
    rootd
     rootd=red

         Text=rootdar baz
The problem is that strings are modified after being copied, when the original
is concatenated upon. The problem goes away if I idup strings:
  _name = name.idup;
  _value = value.idup;
or when I replace 
  a ~= b;
with
  a = a ~ b;


-- 

http://d.puremagic.com/issues/show_bug.cgi?id=2093





------- Comment #1 from bartosz relisoft.com  2008-05-10 14:31 -------
Created an attachment (id=256)
 --> (http://d.puremagic.com/issues/attachment.cgi?id=256&action=view)
Test case


-- 

<d-bugmail puremagic.com> wrote in message 
news:bug-2093-3 http.d.puremagic.com/issues/...

 or when I replace
  a ~= b;
 with
  a = a ~ b;


~ always creates a copy, but ~= will attempt to expand the array in-place.

Now, if this is D2, and ~= is expanding an invariant(char)[] in-place, then 
_that_ is definitely an issue.