12.08.2021 14:07, drug пишет:
12.08.2021 12:36, Learner пишет:
> It seems that there is no easy way to transition from a postblit to a
copy constructor, no?
You just need both const and mutable copy ctors to replace inout one:
```D
struct A {
int[] data;
this(ref return scope A rhs) { data = rhs.data.dup; }
this(ref return scope const A rhs) const { data = rhs.data.dup; }
}
```
the mutable copy ctor accepts mutable data and the const copy ctor
accepts const and immutable data
but using inout ctor is easier:
```D
struct A {
int[] data;
this(ref return scope inout A rhs) /* no inout here */ { data =
rhs.data.dup; }
}
```
The problem is that if you qualify the ctor itself then if you pass
const/immutable rhs to it then the ctor is const/immutable too (like the
args) and of course you cannot modify this, so the error.
To make a copy ctor you need to qualify copy ctor args as inout but the
copy ctor itself shall be mutable and have no const,immutable or inout
qualifier.
