Article View: comp.std.c
Article #5209Re: switch (expression)
From: Karl Heuer
Date: Mon, 18 Jul 1988 16:24
Date: Mon, 18 Jul 1988 16:24
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In article <14036@apple.Apple.COM> lenoil@apple.apple.com.UUCP (Robert Lenoil) writes: >It's really inefficient to do int comparisons when the actual thing you're >CASEing on is a byte. I think that the type of the case labels should be >whatever the type of the switch expression... This is a Quality of Implementation issue. A good optimizer will notice the size of the switch parameter, and take appropriate action. >On a similar note, it annoys me that enums can only be int-valued, when 99% >of the time they'll fit in a char. "Each enumerated type shall be compatible with an integer type; the choice of type is implementation-defined" [Jan88 dpANS, 3.5.2.2]. I believe this allows the implementation to use bytes for byte-sized enumerations. Karl W. Z. Heuer (ima!haddock!karl or karl@haddock.isc.com), The Walking Lint
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Path: arc1-ca.pugleaf.net!utzoo!attcan!uunet!husc6!rutgers!ucla-cs!sm.unisys.com!ism780c!haddock!karl From: karl@haddock.ISC.COM (Karl Heuer) Newsgroups: comp.std.c Subject: Re: switch (expression) Message-ID: <5255@haddock.ISC.COM> Date: 18 Jul 88 16:24:04 GMT References: <1988Jul12.105547.13268@light.uucp> <14036@apple.Apple.COM> Reply-To: karl@haddock.ima.isc.com (Karl Heuer) Organization: Interactive Systems, Boston Lines: 16