Casey Carter d6a2242d97 [span] Tell MSVC how to avoid range-checking (#664) ...

* [span] implement non-member + as a hidden friend

Drive-by: remove garbage `operator-(difference_type, span_iterator)`.

* [span] Use pointers for range-based-for on MSVC

2018-05-09 14:01:22 -07:00

..

gsl

[span] Tell MSVC how to avoid range-checking (#664)

2018-05-09 14:01:22 -07:00