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std::error_category serves as the base class for specific error category
types, such as std::system_category, std::iostream_category, etc. Each
specific category class defines the error_code - error_condition mapping and
holds the explanatory strings for all error_conditions. The objects of error
category classes are treated as singletons, passed by reference.
Member functions
(constructor)
constructs an error_category
operator=
virt. name
obtains the name of the category
virt. default_error_condition(int errorCodeEnumNr)
maps error_code to error_condition
(error_condition(ev, *this).
virt equivalent
compares error_code and error_condition for equivalence
equivalent( int code, const std::error_condition& condition )
= default_error_condition(code) == condition.
virt. message
obtains the explanatory string
operator==operator!=operator<
compares two error categories
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