#ifndef _LIBCPP_ALGORITHM
#define _LIBCPP_ALGORITHM
template <class _Tp, _Tp>
struct integral_constant {
static const _Tp value = _Tp();
};
template <class _Tp>
struct is_nothrow_default_constructible
: integral_constant<bool, __is_constructible(_Tp)> {};
template <class _Tp>
struct is_nothrow_move_constructible
: integral_constant<bool, __is_constructible(_Tp, _Tp)> {};
class allocator {};
#endif