| --- Log opened Fri Jan 03 00:00:03 2020 |
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| 04:07 | <@sshine> | I'd like to turn a value of type (Char[A-Z], Char[A-Z], Int[0-9], Int[0-9], Int[0-9]) into an Int[0-(26*26*10*10*10)]. |
| 04:25 | <&[R]> | https://termbin.com/frgx |
| 04:25 | | * [R] assumes that aa000 == 0 |
| 04:28 | <&[R]> | Also your stated range is one greater than the possible number of values |
| 04:29 | <@sshine> | [R], ah yes, that was a mistake. OK, thanks, so the thing I was confused about was the '*res *= 26;' part. |
| 04:30 | <&[R]> | Which part of it is confusing? |
| 04:30 | <@sshine> | that the letters don't occupy a fixed number of bits. |
| 04:30 | <&[R]> | The math (*= 26) or the pointer dereferencing (*res) |
| 04:30 | <@sshine> | the math. |
| 04:31 | <@sshine> | that each 'digit' can have its own number base just by multiplying. :) |
| 04:31 | <&[R]> | Okay, so it assumes that you already have a value in there, and that value was for the digits that occupied the string before this call |
| 04:32 | <&[R]> | So the proc_n multiplies by 10 because it's got 10 values it could possible have (one being 0) |
| 04:32 | <&[R]> | proc_c has to multiply by 26 for the same reason |
| 04:32 | <@sshine> | right. it's so smart. :-P |
| 04:32 | <@sshine> | thanks! |
| 04:32 | <&[R]> | aa == 0; az == 25, ba == 26 |
| 04:32 | <&[R]> | ab == 1 |
| 04:33 | <&[R]> | There's probably a more clever way to do things, but IMO that's pretty clear code |
| 04:34 | <@sshine> | yes it is! |
| 04:36 | <&[R]> | What did you need this for BTW? |
| 04:44 | <@sshine> | I'm trying to refactor an exercise at Exercism.io |
| 04:45 | <@sshine> | https://github.com/exercism/haskell/tree/master/exercises/robot-name |
| 04:45 | <@sshine> | https://github.com/exercism/haskell/blob/master/exercises/robot-name/examples/success-standard/src/Robot.hs |
| 04:45 | <@sshine> | it's done in an over-complicated, inefficient way right now. |
| 04:47 | <@sshine> | state monad transformers and synchronized mutable variables, and a side-effect is that it'll keep getting slower and slower (the more names that are generated, the more unlikely the function is to terminate). |
| 04:48 | <@sshine> | rather than just... represent a name as a number modulo 26*26*10*10*10 and generate a new one by incrementing that number by some arbitrary coprime seed. |
| 04:49 | <@sshine> | (rather, using a built-in RNG that guarantees that last stuff.) |
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| 18:11 | <@TheWatcher> | https://www.shadertoy.com/view/lsKfWd quake first room, in a shader |
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| --- Log closed Sat Jan 04 00:00:05 2020 |