operator==,!=,<,<=>(std::error_condition) - cppreference.com

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Defined in header

<system_error>

booloperator==(conststd::error_condition&lhs,conststd::error_condition&rhs)noexcept; (1) (since C++11)booloperator!=(conststd::error_condition&lhs,conststd::error_condition&rhs)noexcept; (2) (since C++11)
(until C++20)booloperator<(conststd::error_condition&lhs,conststd::error_condition&rhs)noexcept; (3) (since C++11)
(until C++20)std::strong_orderingoperator<=>(conststd::error_condition&lhs,conststd::error_condition&rhs)noexcept; (4) (since C++20)booloperator==(conststd::error_code&code,conststd::error_condition&cond)noexcept; (5) (since C++11)booloperator==(conststd::error_condition&cond,conststd::error_code&code)noexcept; (5) (since C++11)
(until C++20)booloperator!=(conststd::error_code&code,conststd::error_condition&cond)noexcept; (6) (since C++11)
(until C++20)booloperator!=(conststd::error_condition&cond,conststd::error_code&code)noexcept; (6) (since C++11)
(until C++20)Compares two error conditions.

1) Checks whether lhs and rhs are equal.

2) Checks whether lhs and rhs are not equal.

3) Checks whether lhs is less thanrhs.

4) Obtains three-way comparison result of lhs and rhs.

5) Checks whether code is a semantic match for cond.

6) Checks whether code is not a semantic match for cond.

The <, <=, >, >=, and != operators are

synthesized

from operator<=> and operator== respectively.

(since C++20)Parameters

lhs, rhs, cond - error conditions to compare code - the error code to compare Return value

1)true if the error category and error value compare equal.

2)true if the error category or error value compare are not equal.

3)true if lhs.category()<rhs.category(). Otherwise, true if lhs.category()==rhs.category()&&lhs.value()<rhs.value(). Otherwise, false.

4)lhs.category()<=>rhs.category() if it is not std::strong_ordering::equal. Otherwise, lhs.value()<=>rhs.value().

5)true if either code.category().equivalent(code.value(),cond) or cond.category().equivalent(code,cond.value()).

6)true if neither code.category().equivalent(code.value(),cond) nor cond.category().equivalent(code,cond.value()).

See also