trivialfis 2c502784ff Span class. (#3548)
* Add basic Span class based on ISO++20.

* Use Span<Entry const> instead of Inst in SparsePage.

* Add DeviceSpan in HostDeviceVector, use it in regression obj.
2018-08-14 17:58:11 +12:00
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2018-08-14 17:58:11 +12:00