Returning reference to integer from property setter function

[Adam D. Ruppe]

On Tuesday, 16 October 2012 at 14:43:09 UTC, m0rph wrote:
> Hi! How I can return from function a reference to int?

The problem here isn't about the ref but rather the way 
properties are implemented with +=. I believe this is one of the 
older still-standing D bugs.

It rewrites your expresssion to be

f.foo() += 5;

and the problem is the foo getter returns a plain int which isn't 
an lvalue.


If your getter returned a ref, it would work, but it wouldn't 
call the setter.

The setter is (right now, and probably for a while to come) only 
called on plain assignment.

f.foo = f.foo + 5;

That should work with your current code, being rewritten as 
f.foo(f.foo() + 5), but += won't.



But anyway if you just use the getter and have it return a ref, 
you can use += but then you lose the setter function.