| --- Log opened Wed Feb 03 00:00:48 2016 |
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| 07:41 | <@gnolam> | *THERMONUCLEAR DERP* |
| 07:41 | | * gnolam headdesks repeatedly. |
| 07:44 | < catadroid`> | Que? |
| 07:51 | <@gnolam> | The sudden realization that I had reinvented the square wheel. |
| 07:52 | < catadroid`> | Sometimes, that happens |
| 07:52 | < catadroid`> | I thought I'd done that then I realised what I had mistaken for an abstraction was not |
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| 10:06 | <@Wulfric> | gnolam: Explain. |
| 10:09 | <@gnolam> | Turned out to be one of the times where "I know, I'll use regular expressions" did not in fact lead to me having two problems. |
| 10:10 | <@gnolam> | And I have no idea how that didn't occur to me from the start. |
| 10:41 | <@Wulfric> | I see. |
| 10:41 | <@Wulfric> | Were you parsing the string character by character? |
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| 17:16 | | * Derakon blarghs at Java and code optimizing. |
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| 17:17 | <&Derakon> | I have three different combinations of variants of functions: 8-bit pixels vs. 16-bit, single-component (grayscale) vs. multi-component (e.g. RGB), and cropped with a mask vs. full image. |
| 17:17 | <&Derakon> | I don't wanna write 8 different functions just so they'll be fast enough. :( |
| 17:25 | <&Derakon> | I wish Java had some kind of macro system so I could re-use code between these different variants. |
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| 17:48 | <@Wulfric> | Derakon: Can't you extract some common stuff and share it? |
| 17:50 | <&Derakon> | Wulfric: the functions are literally just double-for loops iterating over a bunch of pixels in slightly different ways. |
| 17:51 | <@[R]> | So... functors |
| 17:52 | <@[R]> | You can do functors |
| 17:55 | <&Derakon> | Not in Java 6. |
| 17:56 | <&Derakon> | I mean, you can have runnables, but I strongly suspect that the increased overhead from calling them would make them impractical. |
| 17:56 | <&Derakon> | Considering that performance is at a premium here. |
| 17:58 | <@[R]> | Java 1.1 is when Anon classes were introduced AFAICT |
| 17:59 | <@[R]> | If only there were some kind of way to time things so as to compare them? |
| 18:00 | <&Derakon> | :p |
| 18:01 | <&Derakon> | I'd have to do some kind of wacky compositing of behaviors with shared state via the class fields or something. |
| 18:02 | | * celticminstrel is currently trying to draw a flow-chart of a relation... :S |
| 18:02 | <@celticminstrel> | ...a textual flowchart, so like "A => B => C => A" or "D <=> e". |
| 18:03 | <&Derakon> | Here's the kinds of variations I'm looking at, BTW: http://pastebin.com/6bLSYsNb |
| 18:03 | <@Wulfric> | Derakon: Abstract class with method loop() that contains the loop and a call to the abstract doCalc(). Child class defines doCalc(). |
| 18:03 | <@Wulfric> | Or is that too newfangled? |
| 18:03 | <@[R]> | That's been supported since Java 1.1 |
| 18:04 | <&Derakon> | Okay, so I'm doing pretty simple things here; I just have to do hundreds of thousands of them very quickly. |
| 18:04 | <&Derakon> | Function call overhead may well be an issue. |
| 18:05 | <@Wulfric> | Aren't there some kind of compiler optimizations like function inlining? |
| 18:05 | | * Wulfric waves hands vaguely. |
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| 18:40 | <&Derakon> | Yeah, so replacing the variants with three different Runnables that accomplish the same thing reduces my performance by about 15%. |
| 18:43 | <@Wulfric> | Pity Java doesn't support static abstract methods. |
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| 19:47 | <&McMartin> | It's not clear what that would even mean; static rather strongly implies "nonvirtual" unless you're using a *very* variant system. |
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| --- Log closed Thu Feb 04 00:00:53 2016 |