Re: [Boost-users] [spirit] real_p fails on negative exponent

Subject: Re: [Boost-users] [spirit] real_p fails on negative exponent
From: Joel de Guzman (joel_at_[hidden])
Date: 2008-12-08 08:07:30

Jan Boehme wrote:
> Hi,
> 
> on my system (RHEL3, libc 2.3.2, gcc 3.2.3, Intel 10.1 which is used to 
> compile and link) real_p fails to parse real numbers like 1.0E-001 and 
> it is most likely the negative exponent as 1.0E001 works as expected.
> Our investigations brought us to numerics.hpp line 162 where the int 
> parser which is used by real_p is declared as 'int_parser<T, 10, 1, -1>' 
> with T=double. I don't see the reason for this yet and
> the 'out of the box' int parser 'int_p' itself is declared using 
> 'int_parser<int>'.
> 
> Here my questions:
> Do I have to expect any problems using int instead double for the real_p 
> exp_n parser?
> Is this a kind of a mistake as even int_p is declared using 'int'?

Please post a minimal test case. I'd venture a guess that the problem
is elsewhere. We do have real_p tests with negative exponents. And
all is fine, as expected. I did test your case and it works fine:

added this in numeric_tests.cpp:

     BOOST_TEST(parse("1.0E-001", real_p).full); //  Good.

Regards,
-- 
Joel de Guzman
http://www.boostpro.com
http://spirit.sf.net