From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00 autolearn=ham autolearn_force=no version=3.4.4 X-Google-Language: ENGLISH,ASCII X-Google-Thread: 103376,dda6cdc6d53fb10d X-Google-Attributes: gid103376,public Path: controlnews3.google.com!news1.google.com!news.glorb.com!news-stoc.telia.net!217.209.241.210.MISMATCH!news-stod.telia.net!telia.net!masternews.telia.net.!newsb.telia.net.POSTED!not-for-mail From: =?ISO-8859-1?Q?Bj=F6rn_Persson?= User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.4.1) Gecko/20031114 X-Accept-Language: sv, en-us MIME-Version: 1.0 Newsgroups: comp.lang.ada Subject: Re: Type detection References: <409243DA.2000906@noos.fr> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: quoted-printable Message-ID: Date: Sat, 01 May 2004 12:42:46 GMT NNTP-Posting-Host: 217.209.116.179 X-Complaints-To: abuse@telia.com X-Trace: newsb.telia.net 1083415366 217.209.116.179 (Sat, 01 May 2004 14:42:46 CEST) NNTP-Posting-Date: Sat, 01 May 2004 14:42:46 CEST Organization: Telia Internet Xref: controlnews3.google.com comp.lang.ada:163 Date: 2004-05-01T12:42:46+00:00 List-Id: Robert I. Eachus wrote: > Bj=F6rn Persson wrote: >=20 >> For the special case of distinguishing integer types from enumeration = >> types, I've been thinking of using something like this... >=20 > I extended the idea a little further, [...] With these additions: > type Unsigned_16 is mod 2**16; subtype Usub is Unsigned_16 range 3 .. 12; subtype Csub is Character range 'b' .. 'c'; > type Weekday is (Monday, Tuesday, Wednesday, Thursday, Friday); >=20 > function Find_Boolean is new Find_Datatype(Boolean); > function Find_Integer is new Find_Datatype(Integer); > function Find_Character is new Find_Datatype(Character); function Find_Csub is new Find_Datatype(Csub); > function Find_Unsigned is new Find_Datatype(Unsigned_16); function Find_Usub is new Find_Datatype(Usub); > function Find_Enumeration is new Find_Datatype(Weekday); >=20 > begin >=20 > Ada.Text_IO.Put_Line(" Find_Boolean returned " & Find_Boolean); > Ada.Text_IO.Put_Line(" Find_Integer returned " & Find_Integer); > Ada.Text_IO.Put_Line(" Find_Character returned " & Find_Character); Ada.Text_IO.Put_Line(" Find_Csub returned " & Find_Csub); > Ada.Text_IO.Put_Line(" Find_Unsigned returned " & Find_Unsigned); Ada.Text_IO.Put_Line(" Find_Usub returned " & Find_Usub); > Ada.Text_IO.Put_Line(" Find_Enumeration returned " & Find_Enumeration= ); I get this output: Find_Boolean returned Enumeration Find_Integer returned Integer Find_Character returned Enumeration Find_Csub returned Enumeration? Find_Unsigned returned Unsigned Find_Usub returned Enumeration? Find_Enumeration returned Enumeration I think using 'Base here too would be better: > if Unknown'Succ(Unknown'Last) =3D Unknown'First if Unknown'Succ(Unknown'Base'Last) =3D Unknown'Base'First Then I get: Find_Boolean returned Enumeration Find_Integer returned Integer Find_Character returned Enumeration Find_Csub returned Enumeration too Find_Unsigned returned Unsigned Find_Usub returned Unsigned Find_Enumeration returned Enumeration --=20 Bj=F6rn Persson jor ers @sv ge. b n_p son eri nu