Here is a list of all documented functions with links to the class documentation for each member:

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- octant() : geos::noding::Octant
- offset() : geos::geom::LineSegment
- OffsetCurve() : geos::operation::buffer::OffsetCurve
- ofLine() : geos::algorithm::Length
- onEdge() : geos::operation::intersection::Rectangle
- oNext() : geos::edgegraph::HalfEdge, geos::triangulate::quadedge::QuadEdge
- onSameEdge() : geos::operation::intersection::Rectangle
- operator[]() : geos::geom::CoordinateSequence
- opposite() : geos::geom::Position
- oPrev() : geos::triangulate::quadedge::QuadEdge
- orientation() : geos::geom::CircularArc
- orientationIndex() : geos::algorithm::CGAlgorithmsDD, geos::geom::LineSegment
- orientationIndexFilter() : geos::algorithm::CGAlgorithmsDD
- OrientedCoordinateArray() : geos::noding::OrientedCoordinateArray
- orientRings() : geos::geom::Polygon
- orig() : geos::edgegraph::HalfEdge, geos::triangulate::quadedge::QuadEdge
- overlap() : geos::index::chain::MonotoneChainOverlapAction, geos::operation::relateng::EdgeSegmentOverlapAction
- overlaps() : geos::geom::Geometry, geos::geom::prep::BasicPreparedGeometry, geos::geom::prep::PreparedGeometry
- overlay() : geos::operation::overlayng::OverlayNG, geos::operation::overlayng::OverlayPoints
- OverlayGraph() : geos::operation::overlayng::OverlayGraph
- OverlayNG() : geos::operation::overlayng::OverlayNG
- OverlayPoints() : geos::operation::overlayng::OverlayPoints