Force null Type?
Blitz3D Forums/Blitz3D Programming/Force null Type?
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| I am trying to make a function that takes a Type instance as an argument, but has it set to default to 0 so that if I want to use all instances of that Type, I can just leave it blank. It's currently crashing when I try: Function MyFunction(e.entity=False) How do I do this? |
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| You can't set a default for a type instance like that ( as I discovered too, although = Null is more logical..) You need to always pass a type instance to the function. Just create a global empty instance .. and pass that. It will always be Null. This has been discussed in the last few months and as I remember there was also an Object / Handle method of acheiving this. Stevie |
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| Yah, there's the Object and Handle way... I think I'll do that. It's a bit of shame to do so because everything was so uniform... |
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| Yeah, I kinda agree, you outta be able to specify a type as null by default in the function parameters. On the other hand, you can always check within the function if a given type parameter is null - if need be. When you call the parameter, you can simply pass 'null' to your function, i.e. "DoMyWork red, 117, Null" works just fine. But I still think we need defaults for type instances as function parameters. |
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| If you really want to use a null value like this then pass it explicitly: MyFunction( Null ). It may be slightly less neat than having a Null default value, but that's a minor nuisance. |
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