Can I set the value of a variable by using the address within DXL doors?

Question

So what I want to do is pass a variable into an eval_ by address and then set the variable in there like so:

string str = "a"
Addr64_ addr = addr_ str
eval_("string ref = addr_ " addr "; ref = \"b\"")
print str // I want it to print b here

I realize I could evalTop_ here to make the top variable available to the eval so it can set it, but this is not the behavior that I am looking for.

Answer 1

So after a lot of debugging and combining different answers from the following sources:

Memory hacks 1

Memory hacks 2

I found a solution! the following code should work for basically any variable:

bool a = false
eval_("bool &a = addr_ " (addr_ (&a)) "; a = true")

print a // should print true