forked from boostorg/regex
When passing std::size_t arguments to length(), str() and operator[] by making these templates enable_if'd on is_integral. Fixes https://github.com/boostorg/regex/issues/197.
When passing std::size_t arguments to length(), str() and operator[] by making these templates enable_if'd on is_integral. Fixes https://github.com/boostorg/regex/issues/197.