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Old   July 19, 2010, 16:23
Default List cannot be trusted...?
  #1
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David Gaden
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Location: Winnipeg, Canada
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Why does setSize() trash my data?

I have:
Code:
class: equationMaster
{
    List<equation> eqns_;
}
Where equation is itself a list:
Code:
class: equation
:
    public List<operation>
{
    // null constructor, friend operators << and >>
   // construct from components and IStream
}
and operation is
Code:
class: operation
{
   // four labels defined, some with enumeration
   // null constructor, friend operators << and >>
   // construct from components and IStream
}
Now, when I do this:
Code:
eqns_.setSize(eqns_size() + 1);
it trashes my operation list.

Anyone with any ideas what is going on? Have I overused lists?

Any assistance would be appreciated...

-Dave
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Old   July 20, 2010, 03:04
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  #2
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Mark Olesen
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Quote:
Originally Posted by marupio View Post
it trashes my operation list.

Anyone with any ideas what is going on? Have I overused lists?

Any assistance would be appreciated...
I'd guess that the copy operation in setSize() might be causing issues.
Without actually knowing anything about your classes, you might nonetheless take a look at PtrList and see it that makes more sense for some of your operations.
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Old   July 20, 2010, 10:26
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David Gaden
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Thanks Mark. (I thought it might be a constructor issue.) I did switch to PtrList and it is behaving now.
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