[mlpack-git] [mlpack] static assertion failed: HRectBound can only be used with the LMetric<> metric type. (#525)

[Li Dong]

When I changed `bound::BallBound<2>` to `bound::BallBound<metric::LMetric<2>>`, that error is gone, but there is still error with `bound::HRectBound<metric::LMetric<2>>`. I think it is caused by the static assert in `hrectbound.hpp`:
```
 29 //! Utility struct where Value is true if and only if the argument is of type
 30 //! LMetric.
 31 template<typename MetricType>
 32 struct IsLMetric
 33 {
 34   static const bool Value = false;
 35 };
 36 
 37 //! Specialization for IsLMetric when the argument is of type LMetric.
 38 template<int Power, bool TakeRoot>
 39 struct IsLMetric<metric::LMetric<Power, TakeRoot>>
 40 {
 41   static const bool Value = true;
 42 };
 43 
 44 } // namespace util
```

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https://github.com/mlpack/mlpack/issues/525#issuecomment-189557056
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