### Unexpected Exception Tracing Output

#### Effect

You get unexpected exception tracing output on standard error, even though the related exception causing the output is caught.

#### Reason

For each exception raised, the write function of class IException::TraceFn is called and writes information about the raised exception to standard error. This trace function write is called whether the related exception is caught or not.

#### Solution

To suppress the trace output, provide your own IException::TraceFn::write tracing function by subclassing IException::TraceFn and register the subclass with setTraceFunction.

Introduction to the Collection Classes
Overall Implementation Structure
Exceptions Defined and Used by the Collection Classes
Exception Causes
Exceptions Caused by System Failures and Restrictions

Enabling Exception Checking
Instantiating the Collection Classes