at¶
-
const_reference
libsemigroups::FroidurePin
::
at
(element_index_type)¶ Returns the element of the semigroup in position
pos
, or anullptr
if there is no such element.This member function attempts to enumerate the semigroup until at least
pos
+ 1 elements have been found. Ifpos
is greater than FroidurePin::size, then this member function returnsnullptr
.