The documentation for stack allocation of classes has the line
 Foo f = new(std.c.stdlib.alloca(Foo.classinfo.init.length)) Foo;
which works fine. The problem is when I try to Foo.classinfo in another
class. For example

class clsB {
  new(uint sz, void* p){ return p; }
  int x,y;
}
struct StorageFor(T:Object) {
  ubyte[T.classinfo.init.length] data;
}
class clsA {
  StorageFor!(clsB) storageForB;
  clsB b;
  this() {
    b = new(&storageForB) clsB;
  }
}
int main() {
  clsA a = new clsA;
  return 0;
}

it errors during the "semantic" phase that clsB doesn't has a property 'classinfo' (even if I remove the template). My guess is that the classinfo's are valid only during a later semantic phase. It would be nice to be able to use classinfo's for placing storage in other classes as well as on the stack.

-Ben

On Tue, 19 Oct 2004 12:10:49 -0400, Ben Hinkle <bhinkle@mathworks.com> wrote:

> class clsB {
>   new(uint sz, void* p){ return p; }
>   int x,y;
> }
> struct StorageFor(T:Object) {
>   ubyte[T.classinfo.init.length] data;
> }
> class clsA {
>   StorageFor!(clsB) storageForB;
>   clsB b;
>   this() {
>     b = new(&storageForB) clsB;
>   }
> }
> int main() {
>   clsA a = new clsA;
>   return 0;
> }

Cool idea.  (cast(TypeInfoClass)typeid(T)).info.init.length  works, but it's not a constant.