Re: [Boost-users] [Fusion] Understanding Fusion

Subject: Re: [Boost-users] [Fusion] Understanding Fusion
From: Cromwell Enage (sponage_at_[hidden])
Date: 2009-07-22 13:57:03

--- On Sat, 7/18/09, Robert Jones wrote:
> Hi All
> 
> I'm very much a Fusion newbie, just getting may head around it, so a
> really basic question!
> 
> From the intro page, when we write
> 
>   #include <boost/fusion/sequence.hpp>
>   #include <boost/fusion/include/sequence.hpp>
> 
>   vector<int, char, std::string> stuff
>   for_each(stuff, print_xml());
> 
> 
> am I correct in believing that there is no loop involved in the
> for_each, and that this resolves, at compile time, to a linear
> list of function calls?

Yes.  IIRC, it resolves to the equivalent of:

  print_xml()(int());
  print_xml()(char());
  print_xml()(std::string());

HTH,
Cromwell D. Enage