operator==,!=,<(std::error_condition) (3) - Linux Manuals

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

NAME

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

Synopsis

Defined in header <system_error>
bool operator==( const error_condition& lhs, const error_condition& rhs ) noexcept; (1) (since C++11)
bool operator!=( const error_condition& lhs, const error_condition& rhs ) noexcept; (2) (since C++11)
bool operator<( const error_condition& lhs, const error_condition& rhs ) noexcept; (3) (since C++11)
bool operator==( const error_code& code, const error_condition& cond ) noexcept; (4) (since C++11)
bool operator==( const error_condition& cond, const error_code& code ) noexcept; (4) (since C++11)
bool operator!=( const error_code& code, const error_condition& cond ) noexcept; (5) (since C++11)
bool operator!=( const error_condition& cond, const error_code& code ) noexcept; (5) (since C++11)

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

Parameters

lhs, rhs - error conditions 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) true if either code.category().equivalent(code.value(), cond) or cond.category().equivalent(code, cond.value()).
5) true if neither code.category().equivalent(code.value(), cond) nor cond.category().equivalent(code, cond.value()).