Is this a valid way to create an array?
BlitzMax Forums/BlitzMax Programming/Is this a valid way to create an array?
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Strict Local atest:Float[,,] atest=New Float[3,4,5] Graphics 400,300,0 While Not KeyHit(key_escape) Cls DrawText atest[2,3,4],0,0 Flip Wend I saw it in someone else's code but I didn't think you could create a multi-dimensional array like that, but I could be wrong because it seems to work... I thought you had to initialise each element in a loop or it wouldn't work. |
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| I think you should only initialise elements not based on basics (string,int,float...). They get basic values (int = 0, float = 0.00... string = "") so no need to init them. Own types have a NULL so they need it. If they don't get initialised some variables may contain garbage but valid for their borders (language dictionary for bytes,ints,doubles,...). bye MB |
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| No - I think this is OK. Hey if it works, right? The thing with initialising in loops is when people are doing C-ish arrays of array pointers, rather than the multi-dimensional array you have here. |
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| initialize: afaik this is only true for custom objects, not for int/float/double/byte/string/etc. as they're built-in objects. As for the rest: I'd say, just do it, and if bmax complains then it's not legal to do so.., simple enough :P edit: well then, 3 reactions in 2 minutes stating the same.. ^_^ edit2: 4 reactions in 3 minutes stating the same.. ^_^ |
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| I could be wrong because it seems to work It works, but dreamora says it is very slow, and that your code will be quicker if you set each field individually. I have not benchmarked this myself tho. |
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| OK thanks all. For some reason one of my framework customers is getting a "list index out of bounds" on that array code in one of their projects - ah just spotted the bug (in his code which is different from that above) I think! |
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| Brucey: In that case it won't be slow. Its a different thing to what you refer to (initializing an array with actual values like int arr[] = [1,2,3] which is slow as this internally fires slicing from what it seems and from its speed I would say three times ...). What above does is initialize a 3 dimensional array. The only way to do it dynamically and normally no problem. (beside the fact that [][][] would be sliceable while above isn't) GA: Whats the bug? Did he/she try to access the array Blitz3D like? ie 0-number of elements? Although the error somehow looks more like an array -> TList -> indexed access error if it is bound to an array |
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| The bug was that they were calling the DRAW command before the initialisation and I only just noticed! |
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| Hey Grey, if I buy your framework, you will debug all of my code for me? Cool! ;) |
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| http://www.greyaliengames.com/framework/faq.html#support including: I cannot answer general programming questions not related to the framework, sorry. Use the Blitz forums for that, they are brilliant! However, I'm nice so sometimes I help where I shouldn't ;-) |
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