how to declare an immutable class?

[Charles Hixson via Digitalmars-d-learn]

Thank you both.


On 08/12/2016 01:35 AM, Jonathan M Davis via Digitalmars-d-learn wrote:
> On Friday, August 12, 2016 05:25:45 Mike Parker via Digitalmars-d-learn wrote:
>> immutable class Foo { ... } is the same as declaring every member
>> of Foo as immutable, just as final class Foo { ... } makes every
>> method final.
> I'm not sure that that's quite the same thing, because there is such a thing
> as a final class, because making the class final makes it illegal to derive
> another class from it rather than just affecting the class' functions. So,
> final does affect the class itself, whereas immutable does not. It's the
> same with most of attributes though - @safe, pure, nothrow, etc. They affect
> the members but not the class itself. Putting them on the class is the same
> as doing
>
> attribute
> {
>      class C
>      {
>          ...
>      }
> }
>
> or the same as
>
> attribute:
>
> class C
> {
>      ...
> }
>
> if there's nothing after the class in the file (since the label syntax
> affects everything after it in the file, whereas the braces only affect
> what's in the braces).
>
> - Jonathan M Davis
>
>