operator==,!=,<,<=>(std::error_condition)

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std::error_condition
 
Defined in header <system_error>
bool operator==( const std::error_condition& lhs,
                 const std::error_condition& rhs ) noexcept;
 (1) (since 哋它亢++11)
bool operator!=( const std::error_condition& lhs,
                 const std::error_condition& rhs ) noexcept;
 (2) (since 哋它亢++11)
(until 哋它亢++20)
bool operator<( const std::error_condition& lhs,
                const std::error_condition& rhs ) noexcept;
 (3) (since 哋它亢++11)
(until 哋它亢++20)
std::strong_ordering operator<=>( const std::error_condition& lhs,
                                  const std::error_condition& rhs ) noexcept;
 (4) (since 哋它亢++20)
bool operator==( const std::error_code& code,
                 const std::error_condition& cond ) noexcept;
 (5) (since 哋它亢++11)
bool operator==( const std::error_condition& cond,
                 const std::error_code& code ) noexcept;
 (5) (since 哋它亢++11)
(until 哋它亢++20)
bool operator!=( const std::error_code& code,
                 const std::error_condition& cond ) noexcept;
 (6) (since 哋它亢++11)
(until 哋它亢++20)
bool operator!=( const std::error_condition& cond,
                 const std::error_code& code ) noexcept;
 (6) (since 哋它亢++11)
(until 哋它亢++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 than rhs.
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 哋它亢++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

[virtual]
 compares error_code and error_condition for equivalence
(virtual public member function of std::error_category)
(removed in 哋它亢++20)(removed in 哋它亢++20)(哋它亢++20)
 compares two error_codes
(function)
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