private void DestroyCurrent()
{
if (_current != null)
{
_current.Destroy();
}
_current = null;
}
public bool MoveNext()
{
// The caller may have stashed a reference to the "view" away somewhere, so we need
// to allocate a new view object.
// The common use for this at the moment will be where T is a COM RCW class; and as
// such one would expect construction / destruction of T to dwarf the 24 or 32 bytes
// of GC overhead per element when iterating. (Particularly given that view objects
// should be short lived and stay on ephemeral GC generations)
// If GC profiling shows that DisposableEnumerableView objects are a lot of GC overhead,
// one may need to replace this wrapper with something that sacrifices some amount of
// safety for perf.
this.DestroyCurrent();
if (_backingEnumerator.MoveNext())
{
_current = new DisposableEnumerableView <T>(_backingEnumerator.Current);
return(true);
}
return(false);
}