nearest(Geometry const &, unsigned)

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##### nearest(Geometry const &, unsigned)

Generate nearest() predicate.

###### Description

When nearest predicate is passed to the query, k-nearest neighbour search will be performed. `nearest()` predicate takes a ``Geometry`` from which distances to ``Values`` are calculated and the maximum number of ``Values`` that should be returned. Internally boost::geometry::comparable_distance() is used to perform the calculation.

###### Synopsis

    template<typename Geometry>
    unspecified nearest(Geometry const & geometry, unsigned k)

###### Parameter(s)

Type | Name | Description
--- | --- | ---
`Geometry const &` | `geometry` | The geometry from which distance is calculated.
`unsigned` | `k` | The maximum number of values to return.

###### Example

    bgi::query(spatial_index, bgi::nearest(pt, 5), std::back_inserter(result));
    bgi::query(spatial_index, bgi::nearest(pt, 5) && bgi::intersects(box), std::back_inserter(result));
    bgi::query(spatial_index, bgi::nearest(box, 5), std::back_inserter(result));

| Warning
Only one `nearest()` predicate may be used in a query.