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Re: [Gnucap-devel] node_t::map

From: al davis
Subject: Re: [Gnucap-devel] node_t::map
Date: Sat, 15 Dec 2012 19:33:44 -0500
User-agent: KMail/1.13.5 (Linux/2.6.32-5-amd64; KDE/4.4.5; x86_64; ; )

On Saturday 15 December 2012, Felix Salfelder wrote:
> as it seems, the call
> _n[i].n_()->set_user_number(_n[j].e_())
> from DEV::expand collapses the nodes i and j.


It is set in alloc_hold_vectors.  Don't tamper with it.

> afaics (as of now) in node_t::map, e_() equals t_().
> node_t::map sets _m = to_internal(t_());
> to make collapses work, e_() should be used here.

> (if this is wrong, please tell me how i'm supposed to
> collapse nodes)

I think what you want is:
_n[i] = _n[j];

This is old code, originally written in "C", still really in 

Think of node_t as a pointer, or like "NODE*".  node_t should 
really be a NODE::iterator.

A "NODE" is the actual node.  It stores info, and exists once 
for each, all in the _nstat array.

Think of that "user_number" as an un-pointer, kind of like the 
"&" takes the address.

Making the whole _nstat array all LOGIC_NODE is really wasteful. 
and a throwback to the old C code.  It is wasteful in the sense 
that analog only nodes carry digital baggage and digital only 
nodes carry analog baggage, just in case it is discovered later 
that you really need a mixed node.  A side benefit of this is 
that you can put analog probes on a digital node or digital 
probes on an analog node, and get an answer.

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