[Boost-users] [variant] a question about recursive typedef

Subject: [Boost-users] [variant] a question about recursive typedef
From: gongyiling (gongyiling2010_at_[hidden])
Date: 2011-11-07 10:34:47

Hello, everyone:

    I want write a general linked list(any element in the list may be
a node or nested general linked list, so recursive).
    I think general linked list could by defined as following(see spirit's
tutorial mini_xml):

    glist = *glist_node
    glist_node = node | glist

so here is the typedef according to the above rules:

struct node
{
    int data;
};
typedef boost::variant<node, boost::recursive_wrapper<glist> > glist_node; 
//typedef 1
typedef std::list<glist_node> glist;    //typedef 2

so the problem comes here,  in the typedef 1, how can I forward declare 
glist?
I know this is not a problem if I define glist as a struct or class, but I 
think the
all-powerful library must has a beautiful solution, if any one has a 
solution,
please let me know.