From Jason Turner

[depr.relops]

C++17 → C++20 1.5 KB 56 lines
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C++ Weekly: Ep 175

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+ ## Relational operators <a id="depr.relops">[[depr.relops]]</a>
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+
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+ The header `<utility>` has the following additions:
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+
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+ ``` cpp
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+ namespace std::rel_ops {
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+ template<class T> bool operator!=(const T&, const T&);
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+ template<class T> bool operator> (const T&, const T&);
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+ template<class T> bool operator<=(const T&, const T&);
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+ template<class T> bool operator>=(const T&, const T&);
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+ }
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+ ```
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+
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+ To avoid redundant definitions of `operator!=` out of `operator==` and
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+ operators `>`, `<=`, and `>=` out of `operator<`, the library provides
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+ the following:
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+
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+ ``` cpp
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+ template<class T> bool operator!=(const T& x, const T& y);
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+ ```
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+
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+ *Requires:* Type `T` is *Cpp17EqualityComparable*
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+ ([[cpp17.equalitycomparable]]).
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+
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+ *Returns:* `!(x == y)`.
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+
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+ ``` cpp
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+ template<class T> bool operator>(const T& x, const T& y);
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+ ```
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+
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+ *Requires:* Type `T` is *Cpp17LessThanComparable*
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+ ([[cpp17.lessthancomparable]]).
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+
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+ *Returns:* `y < x`.
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+
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+ ``` cpp
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+ template<class T> bool operator<=(const T& x, const T& y);
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+ ```
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+
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+ *Requires:* Type `T` is *Cpp17LessThanComparable*
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+ ([[cpp17.lessthancomparable]]).
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+
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+ *Returns:* `!(y < x)`.
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+
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+ ``` cpp
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+ template<class T> bool operator>=(const T& x, const T& y);
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+ ```
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+
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+ *Requires:* Type `T` is *Cpp17LessThanComparable*
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+ ([[cpp17.lessthancomparable]]).
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+
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+ *Returns:* `!(x < y)`.
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+