SYMBIAN: NewLC vs. NewL

It all has to do with the way you implement NewLC and NewL, but the STANDARD difference between NewLC and NewL is whether or not you have to CleanupStack->pop the object created.

Let's first start with the typical implementation of NewL and NewLC

static CObject* newL();
CObject* CObject::NewL() {
----CObject* self = NewLC();
----CleanupStack::Pop(self);
----return self;
}

static CObject* newLC();
CObject* CObject::NewLC() {
----CObject* self = new (ELeave)CObject();
----CleanupStack::PushL(self);
----self->Construct();
----return self;
}

As such, you would instantiate a CObject by using either of the following:

CObject* obj = CObject::NewL();

or

CObject* obj = CObject::NewLC();
// do something with obj that may require cleanup ie. cptrArray->AppendL(obj);
CleanupStack::Pop(obj);

If you do not pop the object, the stack will be messed up and you'll have a very difficult time figuring out why that is.