On Sunday, 13 June 2021 at 17:49:50 UTC, vit wrote:
Is possible create and use scope output range allocated on
stack in @safe code?
Example:
```d
//-dip1000
struct OutputRange{
private bool valid = true;
private void* ptr;
int count = 0;
void put(Val)(auto ref scope Val val){
assert(this.valid == true);
this.count += 1;
}
~this()scope pure nothrow @safe @nogc{
this.valid = false;
}
}
void main()@safe pure nothrow @nogc{
import std.algorithm : copy;
import std.range : only;
scope OutputRange or;
only(1, 2, 3, 4).copy(&or); ///Error: cannot take
address of `scope` local `or` in `@safe` function `main`
assert(or.count == 4);
}
```
Simply remove the `scope` annotation from `or` and from the
destructor and it works:
https://run.dlang.io/is/hElNYf
Because `OutputRange` is a `struct`, it will still be allocated
on the stack even if you don't annotate it as `scope`.
