On Saturday, 15 April 2023 at 14:05:17 UTC, NonNull wrote:
I want a way to default initialize a class variable to a
default object (e.g. by wrapping it in a struct, because
initialization to null cannot be changed directly). Such a
default object is of course not available at compile time which
seems to make this impossible. Can this be done in some way?
Assuming you want a default object that is unique per class
instance rather than shared among all instances of the same
class, then I think the constructor might be where you want to
initialize such a member.
E.g.
```
class Var {
int val;
this(int val) {
this.val = val;
}
}
class MyClass {
Var var;
this() {
var = new Var(3);
}
}
```
I believe if you do initialization at the class declaration
level, then every instance of the class shares the same instance,
e.g.:
```
class Var {}
class MyClass {
Var var = new Var();
}
void main() {
MyClass c1 = new MyClass();
MyClass c2 = new MyClass();
assert(c1.var is c2.var);
}
```
