defining flags

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defining flags #421618 04/21/13 16:20 04/21/13 16:20
Joined: Nov 2008 Posts: 354 saeculum II MPQ OP Senior Member
MPQ OP Senior Member Joined: Nov 2008 Posts: 354 saeculum II	Hi, I want to use a variable which functions as a bit field. I read that I cannot use enum for that, but how do I define these in lite-c? eg enum status = { STAT_1 = 0x01, STAT_" = 0x04 , ...} Thanks! new project in early stage... Intel Xeon X3450 2,66GHz \| Mushkin 8 Gib \| Zotac GTS250 + 7300LE \| A8.3 com

Re: defining flags [Re: MPQ] #421620 04/21/13 17:18 04/21/13 17:18
Joined: Jan 2002 Posts: 4,225 Germany / Essen Uhrwerk Expert
Uhrwerk Expert Joined: Jan 2002 Posts: 4,225 Germany / Essen	Code: define CONST_1 1 define CONST_2 2 // etc. Then you can combine the flags with the binary operators. Always learn from history, to be sure you make the same mistakes again...

Re: defining flags [Re: Uhrwerk] #421626 04/21/13 18:31 04/21/13 18:31
Joined: Sep 2003 Posts: 6,861 Kiel (Germany) Superku Senior Expert
Superku Senior Expert Joined: Sep 2003 Posts: 6,861 Kiel (Germany)	For those who are not aware the 3rd flag would have to be 4, not 3. The 4th flag would be 8 and so on, i.e. 2^n. Alternatively you can use the bit shift operator the same way as it is used in atypes.h: Code: #define FLAG1 (1<<0) // flag1..flag8 for C-Script use #define FLAG2 (1<<1) #define FLAG3 (1<<2) #define FLAG4 (1<<3) #define FLAG5 (1<<4) #define FLAG6 (1<<5) #define FLAG7 (1<<6) #define FLAG8 (1<<7) #define INVISIBLE (1<<8) #define PASSABLE (1<<9) #define TRANSLUCENT (1<<10) // transparent #define OVERLAY (1<<12) ... "Falls das Resultat nicht einfach nur dermassen gut aussieht, sollten Sie nochmal von vorn anfangen..." - Manual Check out my new game: Pogostuck: Rage With Your Friends

Re: defining flags [Re: MPQ] #421672 04/22/13 19:23 04/22/13 19:23
Joined: Jul 2001 Posts: 6,904 H HeelX Senior Expert
HeelX Senior Expert H Joined: Jul 2001 Posts: 6,904	Originally Posted By: MPQ I want to use a variable which functions as a bit field Make sure that the variable type holds all flags. An int holds 4 bytes (32bit) and a long holds 8 bytes (64bit). If you just have 8 flags, use a char, because that is stored as 1 byte. Especially in network scenarios such consideration are interesting. Originally Posted By: MPQ I read that I cannot use enum for that, but how do I define these in lite-c? Enums are not supported in Lite-C and they aren't flags. They are just constant names assigned to a numeric integer value. So if you have in C/C++ e.g. Code: enum { Apple, Orange, Banana, Melon } Fruit; you could do something like that: Code: Fruit fruit = Apple; Internally, they translate to constants like 0, 1 and 2. So, to emulate enums in Lite-C, you could do this, although it involves more writing: Code: #define Apple 1 #define Orange 3 #define Banana 5 #define Melon 7 typedef int Fruit; Fruit fruit = Apple; if (fruit == Melon) error("Shh you got to, shake it, shh shake it, shake it, got to shake it"); else if (fruit == Banana) error("(Shake it sugar) shake it like a Polaroid Picture");