Return true if __x is lexicographically less than __y.
true
__x
__y
Declared in <bslstp_slist.h>
<bslstp_slist.h>
template< class _Tp, class _Alloc> bool operator<( slist<_Tp, _Alloc> const& __x, slist<_Tp, _Alloc> const& __y);