How do I create a module-local immutable class object?

[Jonathan M Davis]

On Friday, September 09, 2011 17:37:26 bearophile wrote:
> Andrej Mitrovic:
> > I need to have an object which is initialized only once, so I thought
> > I could use immutable for that. But I can't do this:
> > 
> > private class Foo {}
> > immutable Foo foo;
> > 
> > static this()
> > {
> > 
> >     foo = new Foo;
> > 
> > }
> > 
> > void main() {}
> 
> private class Foo {}
> immutable Foo foo1;
> 
> static this() {
>     foo1 = new immutable(Foo);
> }
> 
> void main() {
>     auto foo2 = new immutable(Foo);
> }

But make the constructor shared. Otherwise, it gets initialized once per 
thread in spite of the fact that immutable is implicitly shared.