What is the definition of the public method getRootData? Recall that thismethod has a precondition.
What will be an ideal response?
```
template
ItemType BinaryNodeTree
throw(PrecondViolatedExcept)
{
if (isEmpty())
throw PrecondViolatedExcept(
"getRootData() called, but tree is empty.");
els
return rootPtr->getItem();
} // end getRootData
```
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