Modular•12mo ago

_ImmutableString

How can I convert a _ImmutableString to String or StringRef?

6 Replies

Three chickens in the green bag•12mo ago

Since it’s immutable it can’t be changed at all 😄.

Igor•12mo ago

Well yeah, but I want to craete a brand new string based on that _ImmutableString that returns object._value.to..string()...

Three chickens in the green bag•12mo ago

String(example_immutable.copyinit) maybe?

Igor•12mo ago

'_ImmutableString' value has no attribute 'copyinit'

'_ImmutableString' value has no attribute 'copyinit'

Three chickens in the green bag•12mo ago

Can you find the docs page on this for me? And you did __copyinit__?

Stole•12mo ago

The following should do something like you want, but it's important to be careful here with how long values live for. Again, only use this if you absolutely need to. More internal structures like _ImmutableString are probably best left alone.

let o: object = "abcdtest"
let s = o._value.get_as_string() # doing this just to get an example _ImmutableString to play with

let p = Pointer[Int8].alloc(s.length)
memcpy(p, s.data, s.length)
let st = String(p^, s.length) # using the ^ move syntax to denote now st owns p, though it is not at all needed
print(st)
_ = o # keeps o alive, to keep s and therefore its pointer from getting destructed early (we get bad memory otherwise, I guess there could be something else nefarious happening here that we can't see)

let o: object = "abcdtest"
let s = o._value.get_as_string() # doing this just to get an example _ImmutableString to play with

let p = Pointer[Int8].alloc(s.length)
memcpy(p, s.data, s.length)
let st = String(p^, s.length) # using the ^ move syntax to denote now st owns p, though it is not at all needed
print(st)
_ = o # keeps o alive, to keep s and therefore its pointer from getting destructed early (we get bad memory otherwise, I guess there could be something else nefarious happening here that we can't see)

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_ImmutableString