On Friday, 26 August 2022 at 20:42:07 UTC, JG wrote:
Where can I find rules about casting. e.g. I assume casting
away immutable is undefined behavior (or implementation defined
behavior). What about casting to immutable (I would expect at
most it only to be allowed if your type has no references e.g.
ints okay but int[] not etc.) Casting const away (probably not
allowed)? Casting to const (probably allowed).
Anyhow guessing aside where can I find the rules?
Casting immutable/const away:
https://dlang.org/spec/const3.html#removing_with_cast
The cast itself allowed. Mutating the data is not.
Casting to immutable:
https://dlang.org/spec/const3.html#creating_immutable_data
The cast is allowed as long as you don't mutate the data
afterwards.
Conversion to const doesn't need a cast. Mutable and immutable
both implicitly convert to const.
