Defining a custom *constructor* (not initializer!)

[Mehrdad]

Is this possible in D2?

i.e. I'm wondering if there is a way to do the object
construction yourself, which would allow you to call the object's
"constructor" (initializer) manually, and just return a pointer
to the new object.

Something along the lines of:

        class Window
        {
                static Window opConstruct(void* ptr)
                {
                        // Assume ptr is already correctly sized and filled
                        Window result = cast(Window)ptr;
                        result.__ctor();
                        return return result;
                }
        }

It seems like overloading new() *almost* does this, but not
quite: It only lets you allocate the memory, not call the
constructor yourself.

This would be useful, because some objects can have external
constructors (notably when interfacing with C/C++, such as when
using CreateWindow() in Windows), and you *cannot* call these
constructors inside the object's "constructor" (initializer) due
to re-entrancy issues.