std::error_category:: error_category

From cppreference.com
Utilities library
General utilities
Relational operators (deprecated in C++20)
constexpr error_category ( ) noexcept ;
(1) (since C++11)
error_category ( const error_category & ) = delete ;
(2) (since C++11)
1) Constructs the error category object.
2) Copy constructor is deleted. error_category is neither MoveConstructible nor CopyConstructible .

Parameters

(none)

Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR Applied to Behavior as published Correct behavior
LWG 2145 C++11 error_category was not constructible default constructor added