Re: [boost] 1 suggestion + 1 question

From: Vladimir Prus (ghost_at_[hidden])
Date: 2004-05-06 09:49:50

Neal D. Becker wrote:
> 1. Is it possible to expand --help so that it also gives the default values
> of options?  Obviously, it's not likely to tell defaults that it doesn't no
> about, but at least the ones specified by default_value()?

I need to think about it. The biggest issue I see that that it would mean that 
if you have option of type T then T would be required to have operator<<, 
which might be too severe limitation. 

> 2. What was the resolution to the earlier problem of confusing a negative
> parameter value with an option?

I think I've fixed that. See the attached.

- Volodya


attached mail follows:

Hi Neal,

> There is a bug in program_options.  Now I remember, this is why I stopped
> using it before.
> 
> It can't accept negative numbers as command line arguments!

I've just comitted a test and a fix for this problem. 

The log message, which explains the fix, is:

    Solve a problem which prevented specifying negative values. Previously,

       -a -1

    was always parsed as two separate options. Now, we check if '-a'
    requires value and '-1' is not a recognized option. In that case, we
    treat '-1' as value.

> int main (int argc, char** argv) {
>   double angle;

I've cheched your example, and now it works.

Thanks,
Volodya

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