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On 11/8/11 5:18 PM, Patrick Walton wrote:
> The **new** keyword delimits the constructor inside the class
> declaration. It is not used to create instances of the class;
> rather, the class declaration results in the introduction of the
> constructor into the module as a first-class function with bare
> function type and the same name as the class itself.
Does this mean that we can only have one constructor?
If we wish to have several constructors – and if we accept that they
must not have the same name – the class could yield a full module, in
which each constructor is a function.
> There is an alternate class form, **@class** (for example, `@class
> dog { ... }`), which has two effects:
What is the rationale behind **@class**?
> Destructors may not reference any data in the task heap, in order
> to disallow object resurrection.
So a destructor cannot trigger cleanup of any heap-allocated data?
> Class instances are copyable if and only if the class has no
> destructor and all of its fields are copyable. Class instances are
> sendable if and only if all of its fields are sendable and the
> class was not declared with **@class**.
No destructor? I would rather have guessed no constructor, what am I
missing?
> Classes may be type-parametric. Methods may not be
> type-parametric.
Hmmm... What is the rationale?
> ### Interfaces
I like it. Be warned that someone is bound to ask for RTTI to
pattern-match on interfaces and/or on interface fields.
> ### Traits
Ahah, I was just wondering if there were any plans for functors :)
> ### Scoped object extensions (concepts, categories)
>
> Niko has a proposal for this, so I'll let him present it.
Generally, this looks very good.
One more question, though: what about class-less objects? I feel that
they could be quite useful to provide defer-style cleanup.
Cheers,
David
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