Reddit: why aren't people using D?

[Leandro Lucarella]

Rainer Deyke, el 24 de julio a las 11:55 me escribiste:
> Leandro Lucarella wrote:
> > !? It's true that in Python all are references, but there are inmutable
> > objects in Python, like int, float, strings and tuples. From a practical
> > POV it exactly the same as value types, if you do:
> 
> Immutable reference types are still reference types, and follow the same
> rules as other reference types.  You just can't modify them.  The
> assignment operator *always* rebinds a reference, regardless of the
> mutability or immutability of any objects involved.

That's true, conceptually, but when you use the variables, you use them as
value types, with the same advantages and limitations.

> The one exception is that operators like '+=' will create a new object
> when applied to immutable types, but modify existing objects when
> applied to mutable objects.  And, yes, this bothers me in Python.  A lot.

How do you note that? Really. Python inmutables have value semantics.

> But that's still not half as bad as D, where something simple like 'a =
> b; a.x = 5;' can have two completely different meanings depending on
> whether 'a' is a reference type or a value type.

Yes, that's true, but this is a common problem. Think of operator
overloading... Even in Python that could mean *anything* (__getattr__).

-- 
Leandro Lucarella (luca) | Blog colectivo: http://www.mazziblog.com.ar/blog/
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