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DarkBASIC Professional Discussion / UDT question

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EddieRay
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Posted: 7th Oct 2003 22:58 Edited at: 7th Oct 2003 22:59
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With UDTs, can you make assignments as in the last three lines of code below?

type MyData
x as integer
y as integer
name as string
endtype

a as MyData
b as MyData
c as MyData
dim d(1) as MyData

a.x = 1
a.y = 2
a.name = "bob"

b = a
d(1) = b
c = d(1)

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IanM
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Posted: 7th Oct 2003 23:05
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The answer is yes ... but seeing as you've written the code, why didn't you just try it and see?
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EddieRay
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Posted: 8th Oct 2003 01:00
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Not near a PC at the moment... but brain is still working...

So it will copy the members of the UDT from one variable to another or do they variable end up containing a "reference" to the same single UDT structure in memory?

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IanM
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Posted: 8th Oct 2003 01:18
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They are copied - there are no references or pointers to types within DBPro at the moment ... unless you use my array plugin
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DrakeX
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Posted: 8th Oct 2003 05:34
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"unless you use my array plugin"

which is the shi..t BTW

stop looking at me!
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EddieRay
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Posted: 8th Oct 2003 08:36 Edited at: 8th Oct 2003 08:37
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Excellent... I hadn't realized from looking at the online help that UDTs were this capable. Cool! Now if we could just get them to be return-able from a function... ... and something like this to work:

<same as above but add the following>

p as DWORD
e as MyData

make memblock 1, 100
p = get memblock ptr(1)

*p = c
e = *p

The trick would be to make the compiler assume that a pointer variable automatically is pointing to something that is the UDT on the left-hand side of the equals, instead of complaining that both sides need the same members... Weirdly enough, the compiler seems to accept the "*p = c" line. I wonder if it actually copies c into the memblock or not...? Not a ton of good if you can't get it back into a UDT though...

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IanM
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Posted: 8th Oct 2003 15:57
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The '*p = c' line *almost* works - I think that when I tried it, it only copied the first 4 bytes of the type.

Quote: "which is the shi..t BTW"


Does that mean you like it?
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EddieRay
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Posted: 8th Oct 2003 20:31
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What is this "array plugin" IanM? Sounds scary...

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IanM
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Posted: 8th Oct 2003 20:41
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It allows you to do clever things with arrays

- sorting
- reversing
- clearing
- fast swap items
- get low-level array info
- pass arrays by reference (if you are *very* careful)

All you need to do to get it is to navigate through my atrocious site and find it
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