[mlpack-git] [mlpack] RangeSearch constructor: address of '<tree object>' will always evaluate to 'true' (#528)

[Li Dong]

I am using `RangeSearch` in mlpack 2.0.1 as:
```
typedef metric::EuclideanDistance MetricType;
typedef tree::BinarySpaceTree<MetricType> TreeType;
typedef range::RangeSearch<> SearchType;
...
arma::mat dataset(...);
...
TreeType datasetTree(dataset);
....
SearchType a(&datasetTree, true);
```
The C++ compiler is `g++` 5.2.0, and it print warning as:
```
: warning: address of 'datasetTree' will always evaluate to 'true'
      [-Wpointer-bool-conversion]
    SearchType a(&datasetTree, true);
               ~  ^~~~~~~~~~~
1 warning generated.
```

---
Reply to this email directly or view it on GitHub:
https://github.com/mlpack/mlpack/issues/528
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