back Return the last segment Synopsis string back() const noexcept; Declared in file <include/boost/url/segments_base.hpp> on line 272 Defined in file <include/boost/url/impl/segments_base.hpp> on line 114 Description Preconditions this->empty() == false Example assert( url_view( "/path/to/file.txt" ).segments().back() == "file.txt" ); Preconditions this->empty() == false Effects return *--end(); Complexity Linear in this->back().size(). Exception Safety Calls to allocate may throw.