[mlpack] [mlpack/mlpack] Added copy constructor, move constructor and copy assignment operator. (#826)

[Ryan Curtin]

rcurtin commented on this pull request.



>  
+}
+
+template <typename MatType, typename TagType>
+DTree<MatType, TagType>& DTree<MatType, TagType>::operator=(DTree<MatType, TagType>&& obj)
+{
+    if (this != &obj){  

I think the test to see if this is the same as the object being copied is unnecessary.

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