Header <stack> implementation status Reference Implementation : Cannot implement with language itself. Need compiler support. Used C++ N STL : Partially implemented with C++ N : Fully implemented with C++ N : Not yet implemented Features Standard Implemented in Includes <compare> <initializer_list> Classes stack ss::uses_allocator<ss::stack> Functions operator== operator!= operator< operator<= operator> operator>= operator<=> ss::swap(ss::stack)