Annex D (normative) Compatibility features [depr]

D.12 Relational operators [depr.relops]

The header <utility> has the following additions: namespace std::rel_ops { template<class T> bool operator!=(const T&, const T&); template<class T> bool operator> (const T&, const T&); template<class T> bool operator<=(const T&, const T&); template<class T> bool operator>=(const T&, const T&); }
To avoid redundant definitions of operator!= out of operator== and operators >, <=, and >= out of operator<, the library provides the following:
template<class T> bool operator!=(const T& x, const T& y);
Preconditions: T meets the Cpp17EqualityComparable requirements (Table 28).
Returns: !(x == y).
template<class T> bool operator>(const T& x, const T& y);
Preconditions: T meets the Cpp17LessThanComparable requirements (Table 29).
Returns: y < x.
template<class T> bool operator<=(const T& x, const T& y);
Preconditions: T meets the Cpp17LessThanComparable requirements (Table 29).
Returns: !(y < x).
template<class T> bool operator>=(const T& x, const T& y);
Preconditions: T meets the Cpp17LessThanComparable requirements (Table 29).
Returns: !(x < y).