22 Diagnostics library [diagnostics]

22.5 System error support [syserr]

22.5.2 Class error_­category [syserr.errcat]

22.5.2.3 Class error_­category non-virtual members [syserr.errcat.nonvirtuals]

constexpr error_category() noexcept;
1
#
Effects: Constructs an object of class error_­category.
bool operator==(const error_category& rhs) const noexcept;
2
#
Returns: this == &rhs.
bool operator!=(const error_category& rhs) const noexcept;
3
#
Returns: !(*this == rhs).
bool operator<(const error_category& rhs) const noexcept;
4
#
Returns: less<const error_­category*>()(this, &rhs).
[ Note
:
less ([comparisons]) provides a total ordering for pointers.
— end note
 ]