| -----Original Message----- | From: boost-bounces@lists.boost.org | [mailto:boost-bounces@lists.boost.org] On Behalf Of Jeff Garland | Sent: 20 April 2006 15:02 | To: boost@lists.boost.org | Subject: Re: [boost] Report from Berlin C++ Standards | Committee meeting | | On Thu, 20 Apr 2006 11:04:45 +0100, Paul A Bristow wrote | | > | > So some special flag would be needed to hold the Nan or | Inf nature. | > | > | > | > If only there was a Standard representation of Nan and Infs. | > VERY | > shortsighted, making NaNs and infs hardly useable. | | | > Agreed. The types in date_time have the ability to | serialize | and deserilize | > | NADT (not a date time), -infinity and +infinity. Why | > | couldn't there be a | > | simple extension to the numpunct<charT> facet to define an | > | appropriate output | > | string? Basically something like: | > | | > | //see Langer and Kreft p 414... | > | template<class charT> | > | class numpunct : public locale::facet { | > | | > | //new functions for nan and infinity | > | string_type not_a_number_name() const; | > | string_type infinity_name() const; | > | | > | And you'd have to fix num_get as well. | > | > Looks a good idea - but these facets look complicated to my | inexpert | > eye. | > | > Should we ALSO press to get a 'proper' C++0x Standard | solution to this? | | Maybe it isn't clear, these facets already exist (hence the | ref to L&K p414). | I'm just suggesting that we write a proposal to add a couple | methods and them | modify the 'get'/'put' functions to use them. In fact, | someone could probably | write an extended facet to do just this and submit it to Boost if so | motivated. That, frankly, would be more valuable than the | change to the standard. OK - sounds like an excellent project for a student? Small, self-contained, easily testable.. Paul -- Paul A Bristow Prizet Farmhouse, Kendal, Cumbria UK LA8 8AB Phone and SMS text +44 1539 561830, Mobile and SMS text +44 7714 330204 mailto: pbristow@hetp.u-net.com http://www.hetp.u-net.com/index.html http://www.hetp.u-net.com/Paul%20A%20Bristow%20info.html