RE: [boost] [program_options] Recent changes

From: Hartmut Kaiser (HartmutKaiser_at_[hidden])
Date: 2005-04-26 14:42:15

Vladimir Prus wrote:

> just before feature freeze, I've committed some changes to 
> program_options:
> 
> - the command line parser was refactored. For historic 
> reasons, it has its own data structures for representing 
> options, and now it uses the options_description class. The 
> internals were also cleaned up.
> 
> - the 'implicit' option flag was removed. I've asked for 
> comments on this some time ago, and no objections was raised. 
> 
> - some methods of 'options_description' and 
> 'option_description' classes were
>   removed
> 
> - In 1.32, the 'additional_parser' could return only a single 
> option. There's a new method of command line parser -- 
> 'add_style_parser', which can be used to specify a function 
> that can return vector<option>. This might be convenient, for 
> example, for parsing response files
> 
> Except for 'implicit' removal, those changes should not 
> affect users of the library. However, I'd appreciate if user 
> test the new version and report any problems.

I recently had some problems with changed semantics of a 0 (zero) as the
style parameter in

    parse_command_line(argc, argv, opts_desc, 0, ...);
here------------------------------------------^

where the '0' in earlier versions was interpreted as the default_style, but
it is interpreted now as is (as zero).

Was this change a bugfix?

Regards Hartmut