Template:cpp/error/error category/navbar content

From cppreference.com

Member functions
error_category::error_category
error_category::~error_category
error_category::name
error_category::default_error_condition
error_category::equivalent
error_category::message
error_category::operator==error_category::operator!=error_category::operator<error_category::operator<=> (until C++20)(until C++20)(C++20)