Re: [boost] [parameter] Possible breaking change

From: Cromwell Enage (sponage_at_[hidden])
Date: 2006-02-13 08:46:52

--- David Abrahams wrote:
> As part of the new [un]named template parameter
> support, we are considering a breaking change
> to the 
> 
>   binding<ArgumentPack, Keyword, Default = void> 
> 
> metafunction.  Right now, when no 3rd argument is
> supplied indicating the default type, and the
> ArgumentPack contains no matching keyword, the
> result is void.  Under the proposed change, the
> result would be a compile-time error.  The upshot
> is that, to find out whether a particular parameter
> is in the ArgumentPack, you'd need to supply some
> tag type that you know won't appear in the
> ArgumentPack as the 3rd argument to binding, and
> check for that.
> 
> Any objections?

None here.

                              Cromwell D. Enage

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