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Remove all values from the index.
            It calls rtree::clear().
          
template<typename Value,typename Parameters,typename IndexableGetter,typename EqualTo,typename Allocator>voidclear(rtree< Value, Parameters, IndexableGetter, EqualTo, Allocator > &tree)
| Type | Name | Description | 
|---|---|---|
| 
                       | 
                       | The spatial index. |