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匈牙利命名法匈牙利命名法HungarianWhileworkingatMicrosoftIlearned"Hungarian".ThisisaconventionfornamingidentifiersinC(variables,functionsetc.).Theoddnamederivesfromthenationalityofitsinventor,CharlesSimonyi,andthefactthattheresultingnamesareasintelligibletothelaymanasHungarian.Itisinvaluableinlargeprogrammingenvironmentswheremanypeopleuseandchangeasinglebodyofcode(whichmaynotbethecaseinauniversityresearchlab,wherecodeisthrownawaybeforeitgetsachancetogrowto,say,thesizeofWordforWindows).Givenanidentifier,anyonecanpreciselydetermineitstypeandpurpose.Givenapurposeandatype(function,pointertoarrayoffloats,...),anyonecanunambiguouslygenerateanameorpredictwhatnamesomebodyelsechose.(ClosetounambiguouslyformeonWinwordatleast.)Off-by-oneerrors,typemismatches,andmisusedpointersareimpossible.InpracticeHungarianbecomeswhatIcall"Bulgarian",asbasetypesandprefixesforaparticularprojectareused.Iuse"z"forthefloatbasetype,forexample.Youmightuse"st"forastreamasin"FILE*pst=fopen(szFile);".Becauseweuseonly26letters,extremeBulgarianrunsintoparsingambiguity.Kanjiwouldbemuchbetterforthis!ThereisalengthydocumentonitsusewrittenbyDougKlunderatMicrosoft,whichIhavemisplacedsoIcan'tgiveittoyouthoughhemight(dougk@microsoft.com).Thisismyownlittlesummary.HUNGARIANSUMMARY_______________________________BASETYPESfflag(boolean)chcharststring(length-prefixed)szNULL-terminatedstring(ptrto)fnfunctionwwordbbytellonguunsignedwordbitbitvvoidenvenvironmentsbsegmentbaseiboffset______________________________PREFIXESMODIFYINGBASETYPESppointerlpfarptrhphugeptrnpnearptrrgarrayiindexintoarrayccountddifferencehhandlehhhugehandlegrgroup(ofvariable-sizeobjects)bbyteoffset(ina"gr")mpmap(array)followedbyindex&valuetypesdnarray(domain)eelement(of"dn")rgx=mpixxdnx=mpxexfbitflag(ofinteger)shshiftamountuunionaallocation(pointee)vglobal_______________________________SUFFIXESMODIFYINGATYPEFirst..LastLimLast+1Min..Max-1Mic..Mac-1currentMin&MaxMostMac-1
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