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AppGameKit Classic Chat / Define an array with a dynamic size?

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Phaelax
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Posted: 13th Jun 2018 15:16
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Am I just having a stupid moment this morning? Or can I really not calculate the size of an array?

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Bengismo
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Posted: 13th Jun 2018 15:54 Edited at: 13th Jun 2018 20:53
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Add a dim and change the period to a comma



That compiles and works

....and technically....you dont need the = in the #constant lines
#CONSTANT TILE_X x
works ok too but also works if you leave the "=" in there
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Phaelax
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Posted: 13th Jun 2018 18:47
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I know about the equals, I was just trying different things. Period was a typo when I copied it in. doh.

I thought we didn't need to use DIM anymore? I just tried your solution and it still gives the same error.

main.agc:39: error: Unexpected token "x", Array dimension must be an integer literal or a constant (line 7 in the example)
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PSY
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Posted: 13th Jun 2018 19:08 Edited at: 13th Jun 2018 19:16
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Setting the size of an array using an arithmetic expression or a standard variable is not allowed.

Not allowed:
map as integer[SIZE*3]

Not allowed:
tile as integer = 666
map as integer[tile]


EDIT:
The following code works using DIM:


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Bengismo
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Posted: 13th Jun 2018 20:54 Edited at: 13th Jun 2018 20:59
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This compiles and works

x = getVirtualWidth() / 32
y = getVirtualHeight() / 32

#CONSTANT TILE_X = x
#CONSTANT TILE_Y = y

dim map[TILE_X, TILE_Y] as Tile

As long as the type tile actually exists.....
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Phaelax
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Posted: 13th Jun 2018 21:03
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I don't know why that solution wasn't working for me earlier but it is now.
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Markus
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Posted: 18th Jun 2018 14:56
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you can redim with .length =
yes Dim was the older syntax.
https://www.appgamekit.com/documentation/guides/12_array_changes.htm
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Phaelax
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Posted: 20th Aug 2018 17:08
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Thread might be a little old, but I just learned something new related to this.

Since defining constants doesn't actually assign any value to them but merely a reference (or once compiled constants are replaced with whatever is assigned to it), you have to watch out when using a constant in a function if it is pre-calculated. The scope of whatever you use to define the constant has to be accessible from the function as well.

For instance, you could not access "thing" from a function:
foo = 100
#constant thing = foo / 32


But you can if you make "foo" global.
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fubarpk
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Posted: 20th Aug 2018 19:50
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Ive always had no problems with using constants in functions
When the compiler comes accross a constant it replaces its value when it was first declared into it

I use constants all the time and they are my preferred choice
The thing is they should be declared at the beginning of the program then all code can use them
if any function tries to use the same variable name such as thing in your example it will give an error
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Phaelax
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Posted: 20th Aug 2018 22:43
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The problem with constants comes from dynamic or calculated values. If the expression itself isn't global, the function will give an error. So the constant isn't really a value, it acts more like a pointer.
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