Rory Mitchell 70d208d68c
Dmatrix refactor stage 2 (#3395)
* DMatrix refactor 2

* Remove buffered rowset usage where possible

* Transition to c++11 style iterators for row access

* Transition column iterators to C++ 11
2018-10-01 01:29:03 +13:00
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2018-10-01 01:29:03 +13:00