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Why a cleanup stack is needed?
• If a function leaves, control returns immediately to the TRAP harness
within which it was called, generally the default TRAP harness inside
the thread’s Active Scheduler. This means that any automatic variables
within functions called inside the TRAP harness are destroyed.
However, a problem arises if any of these automatic variables are
pointers to objects allocated on the heap. When the leave occurs and
the pointer is destroyed, the object it pointed to is orphaned and a
memory leak occurs
TRAPD( error,doExampleL() );
void doExampleL()
{
CSomeObject* myObject1 = new (ELeave) CSomeObject;
CSomeObject* myObject2 = new (ELeave) CSomeObject;
delete myObject1; // Wrong
delete myObject2;
}
Where enum TLeave {ELeave} is defined in “e32std.h”