Dereferencing PtrData in Ruby/DL

[Carl Youngblood]

Hello. I have allocated a pointer using DL.malloc:

window = DL.malloc(DL.sizeof('P'))

At times in my code I have to pass a pointer this pointer, and at
other times I have to pass in the value of the pointer itself. Does
anybody know how to dereference PtrData?

Thanks,
Carl Youngblood

 

[Jamis Buck]

Hello. I have allocated a pointer using DL.malloc:

window = DL.malloc(DL.sizeof('P'))

At times in my code I have to pass a pointer this pointer, and at
other times I have to pass in the value of the pointer itself. Does
anybody know how to dereference PtrData?

Thanks,
Carl Youngblood

Carl,

I believe that if you have a variable 'x' that is a DL:trData
instance, you can do:

y = x.ref #-> get pointer to the pointer x
z = y.ptr #-> obtain the value that y points to, as a PtrData
assert x == z

I only tried this in IRB, but it appears to work as I described it.

- Jamis