NAME¶

std::error_category - std::error_category

Synopsis¶

Defined in header <system_error>
class error_category; (since C++11)

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
(public member function)
destructor destructs an error_category
[virtual] (virtual public member function)
operator= not copy assignable
[deleted] (public member function)
name obtains the name of the category
[virtual] (virtual public member function)
default_error_condition maps error_code to error_condition
[virtual] (virtual public member function)
equivalent compares error_code and error_condition for equivalence
[virtual] (virtual public member function)
message obtains the explanatory string
[virtual] (virtual public member function)
operator==
operator!=
operator< compares two error categories
operator<=> (function)
(removed in C++20)
(removed in C++20)
(C++20)

Specific error categories

See also¶

error_condition holds a portable error code
(C++11) (class)
error_code holds a platform-dependent error code
(C++11) (class)

generic_category identifies the generic error category
(C++11) (function)
system_category identifies the operating system error category
(C++11) (function)
iostream_category identifies the iostream error category
(C++11) (function)
future_category identifies the future error category
(C++11) (function)