Header file: MapBoundary.h.

The AcMapPolylineBoundary defines a series of points connected by straight lines that define a polyline. An AcMapPolylineBoundary object may or may not be fully closed. If it is not closed, a query can select only those drawing objects that cross the polyline. If it is closed, a query can select drawing objects that either cross or lie inside the polyline boundary.

Do not subclass from this class.

You get an AcMapPolylineBoundary pointer using the new operator, and you are responsible for deleting allocated memory using the delete operator.