llvm/lldb/examples/summaries/essentials

type summary add -s "${var._M_dataplus._M_p}" std::string std::basic_string<char> "std::basic_string<char,std::char_traits<char>,std::allocator<char> >"
type summary add -s "\"${var%@}\"" "NSString *"
type summary add -s "${svar%#} items" -e -x std::map<
type summary add -s "${svar%#} items" -e -x std::vector<
type summary add -s "${svar%#} items" -e -x std::list<