boost::text::range_adaptor_closure
// In header: <boost/text/view_adaptor.hpp> template<typename D> struct range_adaptor_closure { // types typedef int inheritance_tag_with_an_unlikely_name_; };
A backwards-compatible implementation of C++23's std::ranges::range_adaptor_closure. range_adaptor_closure may be a struct template or may be an alias, as required to maintain compatability with the standard library's view adaptors.