Re: [boost] Adding support for auto in Boost.Foreach

Subject: Re: [boost] Adding support for auto in Boost.Foreach
From: lcaminiti (lorcaminiti_at_[hidden])
Date: 2012-02-15 17:15:46

paul Fultz wrote
> 
> Also, on compilers that support variadiac macros, it would be nice to add
> support for commas in the type, such as:
> 
> BOOST_FOREACH(pair<string, string> p, range) {}
> 

I can't try the code below right now... but you should be able to use
BOOST_IDENTITY_TYPE:
https://svn.boost.org/svn/boost/trunk/libs/utility/identity_type/doc/html/index.html

BOOST_FOREACH(BOOST_IDENTITY_TYPE((pair<string, string>)) p, range) {}

This should work on all compilers because it does not require variadics.

(BTW, the comma issue is not a "bug"- it's the way the pp works by spec. If
anything, it can be considered a limitation of the pp specs.)

HTH,
--Lorenzo

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