UT_String question

[Stalkerx777]

Hi. I have a problem with tokenizing UT_String.

While in if scope, tokenize works fine, but when it goes out of scope, array memory get trashed. I guess it because of UT_String tmp variable which gets deleted. Why is that happening? Btw, tokenize calling harden() inside, so the string is deep copied...

UT_ValArray<UT_String> *mimics_parmnames = new UT_ValArray<UT_String>();
mimics_asset = opdir->findOBJNode(args.argp('m'));
if (mimics_asset)
{
    UT_String tmp;
    tmp = args.argp('c');
    tmp.tokenize(*mimics_parmnames);
    if(mimics_parmnames->entries())
       bake_mimics = true;
    cout << "In: " << *mimics_parmnames << endl; // Everything is ok here
}
cout << "Out: " << *mimics_parmnames << endl; // Memory trashed here

[edward]

The default behaviour of UT_String is always do shallow references. So the elements in mimic_parmnames is referencing the tokenized data in tmp. What you want is do:

UT_StringArray mimics_parmnames;

This is almost the same as UT_Array<UT_DeepString>.

[Stalkerx777]

Oh, that how it is.... Yeah, i knew about shallow reference, i just thought i need a deep copy of my tmp string, not an array of deepstrings. Now i get it. When tokenize calls UT_Array<UT_String>::append(), it actually calls copy constructor of UT_String, which is shallow by default, right? That's why we need UT_DeepString (which is the same as UT_String(ALLWAYS_DEEP))

 

Now, it works, thanks Edward! 

[edward]

Right. Making "tmp" deep doesn't help you because it will get deleted when it goes out of scope.