Surogate 38121f2af3 Allow string_view::at() to be constexpr again on VS2015 ...

VS2015 doesn't support extended constexpr. Thanks to Lastique for the
ternary trick

2016-12-12 23:45:34 +01:00

..

boost

Allow string_view::at() to be constexpr again on VS2015

2016-12-12 23:45:34 +01:00