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LuMo
Joined: 21 Aug 2005
Posts: 410
Location: Austria
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 Posted: Thu Aug 25, 2005 11:09 pm Post subject: shift and bitwise comparison |
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how can i implement
| Quote: | op1 | op2 Bitwise OR if both operands are numbers;
conditional OR if both operands are boolean |
in lua? seems that this is not implemented as default
further i'm missing the shift
| Quote: | | op1 << op2 Shift bits of op1 left by distance op2; fills with zero bits on the right-hand side |
shift could be possible solved by *2 and div2 thats right?
any ideas? |
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Shine
Joined: 03 Dec 2004
Posts: 728
Location: Germany
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| Posted: Fri Aug 26, 2005 12:19 am Post subject: |
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| Lua has no binary relational operators, but looks like it could be useful for some low-level calculations, so I've added the "Bitwise operators and hexadecimal support" patch from http://lua-users.org/wiki/LuaPowerPatches and it will be available in the next release, maybe this weekend. Of course, shift operators need no patch, because x << y == x * math.pow(2, y) and x >> y == math.floor(x / math.pow(2, y)). |
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LuMo
Joined: 21 Aug 2005
Posts: 410
Location: Austria
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| Posted: Fri Aug 26, 2005 12:24 am Post subject: |
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| great thanks |
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Arwin
Joined: 12 Jul 2005
Posts: 426
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| Posted: Fri Aug 26, 2005 12:38 am Post subject: |
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| Shine wrote: | | Lua has no binary relational operators, but looks like it could be useful for some low-level calculations, so I've added the "Bitwise operators and hexadecimal support" patch from http://lua-users.org/wiki/LuaPowerPatches and it will be available in the next release, maybe this weekend. Of course, shift operators need no patch, because x << y == x * math.pow(2, y) and x >> y == math.floor(x / math.pow(2, y)). |
Cool! That would solve most of my lua p-sprint problems at the same time. |
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MikeHaggar
Joined: 18 Jul 2005
Posts: 116
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| Posted: Fri Aug 26, 2005 4:31 am Post subject: |
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| Hmm... That hexadesimal stuff might be useful for my textreader ;) |
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