Re: [boost] [Spirit] Using real_parser with user-defined numeric types

From: Hartmut Kaiser (hartmut.kaiser_at_[hidden])
Date: 2007-10-27 13:32:20

John,

I'll look into this later tonight.

Regards Hartmut 

> -----Original Message-----
> From: boost-bounces_at_[hidden] 
> [mailto:boost-bounces_at_[hidden]] On Behalf Of John Maddock
> Sent: Saturday, October 27, 2007 11:58 AM
> To: Boost mailing list
> Subject: [boost] [Spirit] Using real_parser with user-defined 
> numeric types
> 
> I'm having a problem using real_parser, I define the parser as:
> 
> real_parser<some-type> const rr_p;
> 
> Then use it as:
> 
> str_p("range")[assign_a(started, false)] && rr_p[assign_a(a)] 
> && rr_p[assign_a(b)]
> 
> Followed by a list of other alternative commands.
> 
> When some-type is float/double/long double it all works OK, 
> but as soon as I change some-type to boost::math::ntl::RR 
> then I have two problems:
> 
> 1) The code doesn't compile: spirit looks for std::pow rather 
> than relying on ADL to find the right overload, I can work 
> around this one for now by importing boost::math::ntl::pow 
> into namespace std.
> 2) The parser doesn't work, any simple command like "range 0 
> 1" is rejected as invalid.
> 
> Is there something else I need to do here to enable support for UDT's?
> 
> Thanks, John. 
> 
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