Re: [boost] [fusion-2] compile time pair

From: Andreas Pokorny (andreas.pokorny_at_[hidden])
Date: 2005-12-02 17:45:05

On Fri, Dec 02, 2005 at 12:11:32PM -0800, Eric Niebler <eric_at_[hidden]> wrote:
> 
> Andreas Pokorny wrote:
> > Hi,
> > The default implementation of boost::fusion::pair<first,second> only stores 
> > an instance of second. I might need a fusion::pair which does not store
> > that instance either, 
> 
> 
> If you want a map with *no* runtime data, then you should use 
> mpl::map<>, not fusion::map<>. mpl::map<> uses mpl::pair<>, which has no 
> runtime data. (Caveat: mpl::map is broken in more than one respect at 
> the moment. Hopefully, it'll be fixed soon.)

Ah, I could write an interleaved map that splits the pair sequence into 
runtime and compile time info holders. 
How is mpl::map broken?

Regards,
Andreas Pokorny