Boost logo

Boost :

From: Paul A Bristow (pbristow_at_[hidden])
Date: 2006-05-17 11:54:04


| -----Original Message-----
| From: boost-bounces_at_[hidden]
| [mailto:boost-bounces_at_[hidden]] On Behalf Of Robert Ramey
| Sent: 17 May 2006 16:43
| To: boost_at_[hidden]
| Subject: Re: [boost] Stream input and output of NaN and infinity
| Paul A Bristow wrote:
| >> Please can you tell me if you think my pragmatic proposal (now in
| >> version 2) meets these limited objectives.
| A valient effort aimed to deal with a real problem in most
| (if not all) stream i/o implementations.
| However, trying to get everyone in sync with this and having the
| changes ripple through to compilers, libraries, etc will/would take
| years.
| I think that efforts would be more fruitful if directed to fixing
| the problem given the tools we currently have.
| I would like to see a couple of sets of num_put/num_get facets
| which implement the following:
| a) mapping of Nan's to some agreed upon strings such as you
| use in your proposal.
| b) trapping of Nan's on output.
| When users created the a stream, they could do one of the following
| a) nothing - use the current setup
| b) use the "standardized mapping facets"
| c) use the "trapping facets"
| This would permit one to choose the best behavior for the
| current application.
| It's not that I'm against making a submission to the standard, I just
| don't think that a "standard" solution is going to really address the
| problem - its not one size fits all.
| Robert Ramey

I agree strongly - I'd be delighted to see what you suggest, asap.

(An exercise for a 'student'?)

But I think my 'size' may fit many, so I think trying to get it in the
Standard is also a good idea.

(It should never have been left as a muddle like this to start IMO.

The Standard should have said 'if you want to do this, do it like this').

A working implementation showing its usefulness would be powerful persuader
for WG21.
(VisualAge appears to come close already - is anyone using it with

(Preparing this was my 'reward' for attending a BSI WG21 meeting - if I'd
kept my mouth shut I wouldn't have got a homework job ;-)


Paul A Bristow
Prizet Farmhouse, Kendal, Cumbria UK LA8 8AB
+44 1539561830 & SMS, Mobile +44 7714 330204 & SMS

Boost list run by bdawes at, gregod at, cpdaniel at, john at