ListID(list())

[Psych]

It would be useful to know if a certain list (passed in a parameter for example) is the same as another list.

Right now the only solution (as far as I know) is to wrap the list in a structure and use the pointer to that structure variable (thanks to @Idle for this tip).

I am sure the list size is cached, so this being the case could we not get a pointer to this secret cached area? We could then use this pointer to determine if 2 lists are the same (or not).

Code: Select all

*uniqueID - ListID(list())

[AZJIO]

The lists differ by name. Their name is their identifier. To check the sameness of lists, you need to compare their size and then compare their data, that is, compare the elements of the list. There is already a function for this: CompareList(List1() , List2() [, Flags])

[DarkDragon]

The lists differ by name. Their name is their identifier. To check the sameness of lists, you need to compare their size and then compare their data, that is, compare the elements of the list. There is already a function for this: CompareList(List1() , List2() [, Flags])

OP wants to know whether their reference equals, not their value. You can pass the same list as two arguments to a procedure.

[AZJIO]

You can pass the same list as two arguments to a procedure.

It's clear.
In any case, CompareList() most certainly checks the pointer and will not compare the same list. Moreover, CompareList() shows that the lists are the same.

It doesn't throw an error

Code: Select all

Debug CompareList(list1() , list1())

I tried to check the previous data, but got nothing. Perhaps they have a different address.

Code: Select all

Define NewList list1()

AddElement(list1())
list1() = 255

byte = 32
ShowMemoryViewer(@list1() - byte, byte  + 2)

Got the number

Code: Select all

Define NewList list1()
c=3 ; 1-16

For i = 1 To c
	AddElement(list1())
	list1() = 255
Next

byte = SizeOf(Integer) * c * 4 + 4
*x.Integer =  @list1() - byte
Debug *x\i
ShowMemoryViewer(@list1() - byte - 2, byte  + 4)

[Psych]

Got the number

I was sure there was a way to do this, given lists have cached values, I was just hoping there would be a way to have this added natively, and ListID() would fit nicely with existing keywords.
By the looks of it, not much extra coding required.
Could also add a MapID() if possible too.