Re: [Boost-users] [variant] declaring recursive variants

Subject: Re: [Boost-users] [variant] declaring recursive variants
From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2011-11-15 21:27:23

AMDG

On 11/15/2011 06:10 PM, Jerry Jeremiah wrote:
> Actually, I don't want a recursive variant in the normal recursive_wrapper 
> sense.  What I want is this:
> 
> typedef std::list<a> alist;
> typedef std::list<b> blist;
> typedef boost::variant<std::string
>                       ,long double
>                       ,alist::iterator
>                       ,blist::iterator
>                       ,config::iterator
>                       > var;
> typedef std::vector<var> value;
> typedef std::map<std::string,value> message;
> typedef std::map<std::string,message> config;
> 
> But of course I can't do that because I have no idea how to forward declare 
> config.  I suspect that there is no way to do this, but I am not in the same 
> league as everybody else when it comes to this stuff.
> 
> Any suggestions?
> 

Wrap it in a struct and forward declare
the struct.

In Christ,
Steven Watanabe