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Re: [CPROG] Brug af flags i funktioner



> From sslug@sslug  Mon Apr  8 00:39:16 2002
> Subject: [CPROG] Brug af flags i funktioner
>
> Hejsa.
>
> Jeg vil gerne lave en funktion med forskellige flags i.
> Noget i retning af
>
> enum flags{
> 	FLAG_1 = 1 << 1,
> 	FLAG_2 = 1 << 2,
> 	FLAG_3 = 1 << 3
> };
>
> void f(flags f){
> 	...
> }
>
> Man skal så kunne kalde funktionen med f(FLAG_1 | FLAG_2);
>
> Men hvordan er det så lige at jeg herefter finder ud af hvilke flags der er 
> sat.
> Jeg læste det engang et eller andet sted, men har glemt hvor.
>

Test om et flag er sat:

if (f & (~FLAG_1)) blah

Se evt.

http://www.newtonlabs.com/ic/ic_6.html


-- 
   _______
  /       \    Michael Westergaard <sslug@sslug>
 / /|/|  \ \   http://klafbang.dk/
( ( ` |   ) )
 \ \  |/\/ /   Assembler? Nej tak, jeg har ikke brug
  \_______/    for noget RAD værktøj.


 
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