Delegating Constructor only supported by native class objects?

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Stephen R. G. Fraser - 11 Sep 2004 23:23 GMT

Are or will delegating constructors (constructors that can call sibling
constructors) be available for ref classes or only for native classes?

The CLI/C++ specs seems to say that it is a native class thing so I just
want to make sure so that I can include/exclude it from the revision of my
book.

(I also can't seem to get it to work for a ref class, if it is supported.)

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Carl Daniel [VC++ MVP] - 12 Sep 2004 01:39 GMT

> Are or will delegating constructors (constructors that can call
> sibling constructors) be available for ref classes or only for native
[quoted text clipped - 6 lines]
> (I also can't seem to get it to work for a ref class, if it is
> supported.)

Forwaring constructors aren't supported by the C++ language at all. There's
currently a proposal to the C++ committee to add that ability in the next
rev of the C++ standard, but that's still 4+ years away.

That said, I haven't looked at what the C++/CLI spec says in this regard.
If they are supported, I'd expect it would be for ref types only, since
they're definitely NOT supported for native types.

-cd

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Carl Daniel [VC++ MVP] - 12 Sep 2004 01:42 GMT

> Forwarding constructors aren't supported by the C++ language at all.
> There's currently a proposal to the C++ committee to add that ability
[quoted text clipped - 3 lines]
> regard. If they are supported, I'd expect it would be for ref types
> only, since they're definitely NOT supported for native types.

Indeed, the C++/CLI spec only mentions this feature in the "Future
Directions" section, so I'd say that for Whidbey the answer is clearly "not
supported for any types".

-cd

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Brandon Bray [MSFT] - 15 Sep 2004 02:03 GMT

> Indeed, the C++/CLI spec only mentions this feature in the "Future
> Directions" section, so I'd say that for Whidbey the answer is clearly
> "not supported for any types".

That's right. After the C++ standards committee took to designing parts of
the feature, the Visual C++ team backed off of implementing this feature.
Anytime the standards committee starts working on a design, it's very risky
for us to implement it is a release product.

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Brandon Bray, Visual C++ Compiler http://blogs.msdn.com/branbray/
Bugs? Suggestions? Feedback? http://msdn.microsoft.com/productfeedback/

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Delegating Constructor only supported by native class objects?

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