Jiaming Yuan b61d534472
Span: use size_t' for index_type, add front' and `back'. (#4935)
* Use `size_t' for index_type.  Add `front' and `back'.

* Remove a batch of `static_cast'.
2019-10-14 09:13:33 -04:00
..
2019-09-05 19:09:38 -04:00