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From: comeau@panix.com (Greg Comeau)
Newsgroups: comp.lang.ada,comp.lang.c++,comp.realtime,comp.software-eng
Subject: Re: [OT] Re: Teaching new tricks to an old dog (C++ -->Ada)
Date: 12 Mar 2005 22:21:19 -0500
Organization: Comeau Computing; http://www.comeaucomputing.com
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References: <4229bad9$0$1019$afc38c87@news.optusnet.com.au>
 <d0st28$ep65@cui1.lmms.lmco.com> <1110607809.837000@at
 <1110655701.196383@athnrd02>
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Xref: g2news1.google.com comp.lang.ada:9285 comp.lang.c++:45383
 comp.realtime:1404 comp.software-eng:4970
Date: 2005-03-12T22:21:19-05:00
List-Id: <comp.lang.ada>

In article <1110655701.196383@athnrd02>,
Ioannis Vranos  <ivr@remove.this.grad.com> wrote:
>Martin Krischik wrote:
>
>> Well actualy: since 4 is not a valid value for the enum four_val the Ada
>> compiler won't compile the code - Ada does not automaticy convert enums
>> into integer.
>> 
>> The way you would do it in Ada is
>> 
>> pragma Assert (x'Valid);
>> 
>> The 'Valid attribute checks if a variable contains a valid value.
>
>
>Now that I am thinking of it, isn't it a value range?
>
>
>int main()
>{
>     enum four_val {a,b,c,d};
>
>     four_val x;
>
>     x = 4;
>}
>
>
>C:\c>g++ temp.cpp -o temp.exe
>temp.cpp: In function `int main()':
>temp.cpp:7: error: invalid conversion from `int' to `main()::four_val'

In C++ but not in C it's an error, but it can also be "invalidly"
cast to the enum.
-- 
Greg Comeau / Comeau for the Mac?   Stay tuned.
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