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Extract a subset of geometries from a BoostGeometries object.
# S4 method for BoostMultiPolygons,ANY,ANY [(x, i)# S4 method for BoostMultiLines,ANY,ANY [(x, i)# S4 method for BoostMultiPoints,ANY,ANY [(x, i)
# S4 method for BoostMultiLines,ANY,ANY [(x, i)
# S4 method for BoostMultiPoints,ANY,ANY [(x, i)
A BoostGeometries object.
An integer vector index.