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 provides a total ordering for pointers.  — end note ]