How to check for nil/null on a Type?

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bigtunacan

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Joined: 24th Jul 2015

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Posted: 23rd Jan 2017 23:21

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I need to do a check if a type has been assigned a value yet, but as far as I can tell there is not support for NIL/NULL in AGK. What I'm trying to do is something like this.

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foo as GamePiece 

if coll = 1 and tileArray[ix].piece = NULL
    SetSpritePosition(player_pieces[drag_piece_id].piece.smallSprite, GetSpriteX(tileArray[ix].bgSprite), GetSpriteY(tileArray[ix].bgSprite))
    tileArray[ix].piece = player_pieces[drag_piece_id].piece
    player_pieces[drag_piece_id].state = PLACED
endif

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easter bunny

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Joined: 20th Nov 2012

Playing: Dota 2

Posted: 24th Jan 2017 00:02

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I do it like this:

+ Code Snippet

type GamePiece
 spriteID as integer
 bar as integer
 active as integer //assign this a value of 1 when the piece is in use. Set it to 0 when deleting the piece
endtype

foo as GamePiece
foo2 as GamePiece

foo.spriteID=CreateSprite(0)
foo.active=1

print(foo.active)
print(foo2.active)

//Delete foo
DeleteSprite(foo.spriteID)
foo.spriteID=0
foo.active=0

print(foo.active)
print(foo2.active)

Might not be the best way, but it works

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bigtunacan

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Joined: 24th Jul 2015

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Posted: 24th Jan 2017 00:13

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Not what I was hoping to hear, but it works

Thanks

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Markus

Valued Member

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Joined: 10th Apr 2004

Location: Germany

Posted: 24th Jan 2017 00:53

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agk just using a struct as a memoryblock with default values, so integer =0 float = 0.0 string link to ""
other way, using ix as content and fill the list only with filled data. its different, access by row/column is more common and works without search.

this will make a copy, if you not want maybe just memory the index here.
tileArray[ix].piece = player_pieces[drag_piece_id].piece

and btw agk support the ref (by reference) in function arguments

AGK (Steam) V2017.01.09 : Windows 10 Pro 64 Bit : AMD (16.12.1) Radeon R7 265 : Mac mini OS Sierra (10.12.2)

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