The function is_one determines if a value is equal to 1 or not.
The function is guaranteed to be well defined in case the argument type
is a model of the IntegralDomainWithoutDivision concept.
#include <CGAL/number_utils.h>
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| The result_type is convertible to bool. |
IntegralDomainWithoutDivision
AlgebraicStructureTraits::IsOne