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3.5.3 Boolean Types

Static Semantics

   {Boolean} There is a predefined enumeration type named Boolean, [declared in the visible part of package Standard]. {False} {True} It has the two enumeration literals False and True ordered with the relation False < True. {boolean type} Any descendant of the predefined type Boolean is called a boolean type.
Implementation Note: An implementation is not required to support enumeration representation clauses on boolean types that impose an unacceptable implementation burden. See 13.4, ``Enumeration Representation Clauses''. However, it is generally straightforward to support representations where False is zero and True is 2**n - 1 for some n.

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