19 Diagnostics library [diagnostics]

19.5 System error support [syserr]

19.5.6 Comparison operator functions [syserr.compare]

bool operator==(const error_code& lhs, const error_code& rhs) noexcept;
Returns: lhs.category() == rhs.category() && lhs.value() == rhs.value()
bool operator==(const error_code& lhs, const error_condition& rhs) noexcept;
Returns: lhs.category().equivalent(lhs.value(), rhs) || rhs.category().equivalent(lhs, rhs.value())
bool operator==(const error_condition& lhs, const error_condition& rhs) noexcept;
Returns: lhs.category() == rhs.category() && lhs.value() == rhs.value()
strong_ordering operator<=>(const error_code& lhs, const error_code& rhs) noexcept;
Effects: Equivalent to: if (auto c = lhs.category() <=> rhs.category(); c != 0) return c; return lhs.value() <=> rhs.value();
strong_ordering operator<=>(const error_condition& lhs, const error_condition& rhs) noexcept;
Returns: if (auto c = lhs.category() <=> rhs.category(); c != 0) return c; return lhs.value() <=> rhs.value();