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Date: Thu, 28 Apr 2011 09:41:57 -0400
From: Hyman Rosen <hyrosen@mail.com>
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Subject: Re: Fun with C
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Date: 2011-04-28T09:41:57-04:00
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On 4/28/2011 1:13 AM, David Thompson wrote:
> On Thu, 21 Apr 2011 15:27:40 -0400, Hyman Rosen<hyrosen@mail.com>
> wrote:
>> That doesn't work for C because a variable of an enum type
>> may hold any integer value up to the number of bits taken
>> by the largest enumerator (with a variation for negatives
>> that isn't important here). The C enum concept is meant to
>> encompass literals used as bit masks as well as singular
>> values.
>
> s/up to/up to at least/

C++ restricts the permitted values, as per 7.2/6:
     For an enumeration where e{min} is the smallest enumerator
     and e{max} is the largest, the values of the enumeration
     are the values of the underlying type in the range b{min}
     to b{max}, where b{min} and b{max} are, respectively, the
     smallest and largest values of the smallest bit-field that
     can store e{min} and e{max}.

     On a two's-complement machine, b{max} is the smallest value
     ≥ max(|e{min}|-1,|e{max}|) of the form 2**M-1; b{min} is 0
     if e{min} ≥ 0 and -(b{max}+1) otherwise.