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Pointer to unstructured var
Posted: Sun Feb 14, 2016 9:47 am
by Sirius-2337
Can't access a unstructured vars value with pointers
x is 'undefined'
y is ok (96)
Code: Select all
Structure Inti
i.i
EndStructure
Procedure Something()
Protected x, y.Inti
Protected *PointerToX.Inti, *PointerToY.Inti
x = 76
y\i = 96
*PointerToX = @x
*PointerToY = @y
Debug *PointerToX\i
Debug *PointerToY\i
EndProcedure
Something()
Firefox, Chrome, SB1.20
In PB this works
Re: Pointer to unstructured var
Posted: Sun Feb 14, 2016 2:07 pm
by Fred
In SB, pointer has to point to a same structured element, or it won't work.
Re: Pointer to unstructured var
Posted: Sun Feb 14, 2016 4:32 pm
by skywalk
Is this a limitation of JS? We can still manipulate via memory lib.
Code: Select all
Define *p.Double = AllocateMemory(SizeOf(Double))
Define.d x = 100.0
Define.i i = 99
*p\d = x
PokeD(*p, 0, -9.9)
Debug PeekD(*p, 0)
PokeL(*p, 0, i)
Debug PeekL(*p, 0)
PokeA(*p, 0, 1)
Debug PeekL(*p, 0)
Re: Pointer to unstructured var
Posted: Sun Feb 14, 2016 5:36 pm
by Fred
Regular variables are not based on arraybuffer, it would be too slow. BTW, the first *p\d = x doesn't work, as it creates a new field in the object.
Code: Select all
Define *p.Double = AllocateMemory(SizeOf(Double))
Define.d x = 100.0
Define.i i = 99
*p\d = x
Debug PeekD(*p, 0)
Re: Pointer to unstructured var
Posted: Sun Feb 14, 2016 6:27 pm
by skywalk
Yeah, that is confusing. Is this not considered a bug?
Re: Pointer to unstructured var
Posted: Sun Feb 14, 2016 6:57 pm
by Fred
No, but it needs to be properly documented, that's true.