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DarkBASIC Professional Discussion / Arrays within custom data types.

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Athas
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Posted: 23rd Oct 2003 17:55
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Does anyone know of a way to put array's into types. I'll show you what I mean




Note this isn't my real code but its similar so pardon if there are any mistakes.

Basically I can't seem to create a type which contains an array as above.

I'd like to be able to use it like
Code:




Are there any workarrounds for more flexible data types. Maby using memblocks and ponters???
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IanM
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Posted: 23rd Oct 2003 20:16
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No, because you can't do it.

The standard advice I give is to use a parallel array

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Athas
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Posted: 24th Oct 2003 15:38
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Thanks Ian,

Any chance of that getting added in a future patch or is that asking too much. Oh the other function I would like to see added is MOD its really quite usefull for the maths. (I've actually got my own function for MOD ) but it does seem a strange omission when WrapValue( ) or whatever its called is included.
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spooky
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Posted: 24th Oct 2003 15:41
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MOD already exists!

print 10 mod 3

If your mansion house needs haunting, just call Rentaghost!
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IanM
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Posted: 24th Oct 2003 15:47
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Quote: "Any chance of that getting added in a future patch"


Don't ask me - I'm just an 'interested party' that likes to help out

Arrays are a difficult question really. What most people don't know is that an array (for DBPro) isn't just a few pigeon holes in memory - it's a whole 60+byte structure that changes sizes depending on how many items it holds.

What we may end up with is a restricted type of array for types that cannot be resized and cannot hold strings or types with strings (to avoid cascading copies) - what we finally do get will be up to Lee


mod - just one of the few undocumented functions/commands

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Athas
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Posted: 24th Oct 2003 15:50
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Are there many undocumented functions? Sorry I'm really new to DBPRO I used to use Classic quite a bit and VB an awfull lot.
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IanM
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Posted: 24th Oct 2003 16:02
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There are local/global keywords for scope

dims outside of a function are always global, dims within functions are always local

Accessing an array like this 'x()' with no index accesses the 'current' cell (see NEXT ARRAY INDEX/PREVIOUS ARRAY INDEX)

Prefixing a number with a zero causes DBPro to deal with it as octal (not just a prefix of 0c as stated in the help)

Constants are textual substitutes, so the following code doesn't quite work as expected



Reading/writing from memory using pointers - not going to go there , but I have a set of rules that seem to work well for me.

Maybe others that I can't think of right now
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Athas
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Posted: 24th Oct 2003 16:14
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Thanks ian hey constants being textual substitutions could actually be very usefull in some circumstances I'm going to have a play I actually used to use DARKEDIT in that way. defineing bits of text I wanted though I would never have guessed that DBPRO opperated in the same way.

Very helpful,
Thanks again
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IanM
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Posted: 24th Oct 2003 16:22
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I have actually used the constants as a crude conditional compilation - extracted from my A* code in CodeBase

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Athas
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Posted: 2nd Nov 2003 21:38 Edited at: 2nd Nov 2003 21:38
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Quote: "
No, because you can't do it.

The standard advice I give is to use a parallel array

"


Hey I was just wondering if you could add a line saying


if they are just textual substitutions
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Duffer
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Posted: 3rd Nov 2003 01:15
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@ IanM

This mod command - could you say a = (10 mod 3)?
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DrakeX
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Posted: 3rd Nov 2003 02:10
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umm yeah. you can also use %% for mod, if you're used to C's % operator for mod.

stop looking at me!
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Duffer
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Posted: 4th Nov 2003 01:10
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@ DrakeX and IanM - pls explain.... it make no sense to me (IQ of tepid glass of lemonwater...)

could you give some workable examples of Mod in DBPro?
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IanM
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Posted: 4th Nov 2003 01:16
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Sorry, but you seemed to know what it does ...

print 10 mod 3

this would print 1 as the answer, so ...

a = 10 mod 3

would put the value 1 into variable a
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Duffer
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Posted: 5th Nov 2003 00:21
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@ IanM,

Thanks - knew what Mod did from my old Amos days but wanted to see how it was implimented in DBPro - ta
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