The [docs](https://www.boost.org/doc/libs/latest/libs/utility/doc/html/utility/utilities/string_view.html) do not mention the `contains` members. Also `ends_with` and friends are still marked as "boost extensions": https://github.com/boostorg/utility/blob/e675dfc8139061c9debd0847cecf34963ad6539b/include/boost/utility/string_view.hpp#L244 They are part of C++20 `std::string_view` now.
The docs do not mention the
containsmembers.Also
ends_withand friends are still marked as "boost extensions":utility/include/boost/utility/string_view.hpp
Line 244 in e675dfc
They are part of C++20
std::string_viewnow.