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Showing content from https://en.cppreference.com/w/cpp/language/../error/error_code/../error_category/operator_cmp.html below:

std::error_category::operator==,!=,<,<=> - cppreference.com

bool operator==( const error_category& rhs ) const noexcept;

(1) (since C++11)

bool operator!=( const error_category& rhs ) const noexcept;

(2) (since C++11)
(until C++20)

bool operator<( const error_category& rhs ) const noexcept;

(3) (since C++11)
(until C++20) (4) (since C++20)

Compares to another error category.

1) Checks whether *this and rhs refer to the same object.

2) Checks whether *this and rhs do not refer to the same object.

3)

Orders

*this

and

rhs

by the order of

this

and

&rhs

. Equivalent to

std::less<const error_category*>()(this, &rhs)

The <, <=, >, >=, and != operators are synthesized from operator<=> and operator== respectively.

(since C++20) [edit] Parameters rhs - specifies the error_category to compare [edit] Return value

1) true if *this and rhs refer to the same object, false otherwise.

2) true if *this and rhs do not refer to the same object, false otherwise.

3) true if *this is less than rhs as defined by the order of this and &rhs.

4) std::strong_order::less if *this is less than rhs as defined by the order of this and &rhs, otherwise std::strong_order::greater if rhs is less than *this in the order, otherwise std::strong_order::equal.

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