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Re: [qi] order of aleternatives

by Hartmut Kaiser :: Rate this Message:

> Carl Barron wrote:
> > I thougt x = a | b | c | d ; would do
> >
> > if a matches then match found
> > else if b matches then match found
> > else if c matches then match found
> > else if d matches then match found
> > else match not found
> >
> > How ever integere in attached code appears to test zero (last
> > alternative) first, is this a bug
> > or a feature?? All integer is supposed to do is determine base and
> > convert text to a 32 bit unsigned integer, This is a simple qi
> parser
> > of ipv4_addresses no lex.
>
> Hmmm.. Looks like a bug indeed :(.
> Can you simplify the code to a minimum test case?

It's not a bug. These are wrong:

qi::uint_parser<uint32_t,16,-1,-1> hex_int;
qi::uint_parser<uint32_t,8,-1,-1> octal_int;

The third template arguments are treated as unsigned ints, which requests
matching of at least (uint)(-1) digits, which is clearly not the desired
functionality. Change that to:

qi::uint_parser<uint32_t,16,1,-1> hex_int;
qi::uint_parser<uint32_t,8,1,-1> octal_int;

or just

qi::uint_parser<uint32_t,16> hex_int;
qi::uint_parser<uint32_t,8> octal_int;

or even simpler, just use the predefined parsers 'hex' and 'oct' instead.
Then everything works as expected.

Regards Hartmut

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