std::error_category::equivalent

std::error_category::equivalent - cppreference.com

From cppreference.com

`virtual bool equivalent( int code, const std::error_condition& condition ) const noexcept;`	(1)	(since C++11)
`virtual bool equivalent( const std::error_code& code, int condition ) const noexcept;`	(2)	(since C++11)

Checks whether error code is equivalent to an error condition for the error category represented by *this.

1) Equivalent to default_error_condition(code) == condition.

2) Equivalent to *this == code.category() && code.value() == condition.

code	-	specifies the error code to compare
condition	-	specifies the error condition to compare

true if the error code is equivalent to the given error condition for the error category represented by *this, false otherwise.