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July 19, 2017 Base class' constructor is not implicitly inherited for immutable classes. A bug or a feature? | ||||
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Hello, I have this code: immutable class Base { this() {} } immutable class Derived : Base {} void main() { new immutable Derived(); } I'd like class Derived to automatically inherit the default constructor from Base. However, this is not the case: main.d(6): Error: class main.Derived cannot implicitly generate a default ctor when base class main.Base is missing a default ctor Is it a bug or it should be like this? |
July 20, 2017 Re: Base class' constructor is not implicitly inherited for immutable classes. A bug or a feature? | ||||
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Posted in reply to Piotr Mitana | On Wednesday, 19 July 2017 at 16:00:56 UTC, Piotr Mitana wrote:
> Hello, I have this code:
>
> immutable class Base
> {
> this() {}
> }
>
> immutable class Derived : Base {}
>
> void main()
> {
> new immutable Derived();
> }
>
> I'd like class Derived to automatically inherit the default constructor from Base. However, this is not the case:
>
> main.d(6): Error: class main.Derived cannot implicitly generate a default ctor when base class main.Base is missing a default ctor
>
> Is it a bug or it should be like this?
I'd say it's a bug. There was a similar issue at one point where it wouldn't consider default constructor with default args.
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July 20, 2017 Re: Base class' constructor is not implicitly inherited for immutable classes. A bug or a feature? | ||||
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| ||||
Posted in reply to Piotr Mitana | On Wednesday, 19 July 2017 at 16:00:56 UTC, Piotr Mitana wrote:
> Hello, I have this code:
>
> immutable class Base
> {
> this() {}
> }
>
> immutable class Derived : Base {}
>
> void main()
> {
> new immutable Derived();
> }
>
> I'd like class Derived to automatically inherit the default constructor from Base. However, this is not the case:
>
> main.d(6): Error: class main.Derived cannot implicitly generate a default ctor when base class main.Base is missing a default ctor
>
> Is it a bug or it should be like this?
Interesting that the same code without immutable works.
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July 20, 2017 Re: Base class' constructor is not implicitly inherited for immutable classes. A bug or a feature? | ||||
---|---|---|---|---|
| ||||
Posted in reply to Piotr Mitana | On Wednesday, 19 July 2017 at 16:00:56 UTC, Piotr Mitana wrote:
> Hello, I have this code:
>
> immutable class Base
> {
> this() {}
> }
>
> immutable class Derived : Base {}
>
> void main()
> {
> new immutable Derived();
> }
>
> I'd like class Derived to automatically inherit the default constructor from Base. However, this is not the case:
>
> main.d(6): Error: class main.Derived cannot implicitly generate a default ctor when base class main.Base is missing a default ctor
>
> Is it a bug or it should be like this?
compiles with:
dmd 2.073
fails with:
dmd 2.074
dmd 2.075
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