Value | Value2 etc
BlitzMax Forums/BlitzMax Programming/Value | Value2 etc
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| How would you parse this, is it just a simple thing? for instance const enableMouse:int = 100, enableKeyBoard:int = 101 ... test(enableMouse | enableKeyboard) ... function test(cmdLine:int) ...work out what combination of ints the cmdLine contains here end function I would be looking to do the same as for instance... createwindow does for its style in maxgui. |
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const enableMouse:int = 1, enableKeyBoard:int = 2, somethingelse:int = 4, morestuff:int = 8 '... and so on. ... test(enableMouse | enableKeyboard) ... function test(cmdLine:int) if cmdLine & enableMouse EndIf If cmdLine & enableKeyboard Endif end function |
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| What Gfk said. Important point to observe is that your flag definitions have to be powers of 2. |
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| ahhh thanks great. |
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| Just for clarity of the mechanism used (it's always nice to know why and not only how imho): What the "power of 2" above actually does is to define names name to certain bits (you know the 1 and 0 of computers) in an variable. Lets say you have a byte (values: 0-255) you can also write it binary as values 00000000-11111111. Now let's say we give each bit-position a name: 0 0 0 0 0 0 0 0 e s s f f t t o i e i i o h w n g v x v u r o e h e e r e t n e The values of a bit-value of 1 in each position is as follows: one = 1 two = 2 three= 4 four = 8 five = 16 six = 32 seven = 64 eight = 128 Here you have the "power of 2" values, right? And just as Gfk shows in his example one can use bit-manipulation operators like "|" and "&" to set bits or test if they are set. |
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| Mahan, while your example should allow the orignal poster a better understanding of what your trying to convay, it should be noted how to compute the actual bit position values... Position: 2^7+2^6+2^5+2^4+2^3+2^2+2^1+2^0 So a binary number such as 01101001 would be: 2^7*0 + 2^6*1 + 2^5*1 + 2^4*0 + 2^3*1 + 2^2*0 + 2^1*0 + 2^0*1 = 105 decimal or more simply: 0+64+32+0+8+0+0+1 = 105 :D |
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