Re: [Boost-users] Questions about using program_options

From: Rupert Bruce (rupert_at_[hidden])
Date: 2008-05-23 18:32:24

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Chris Ross wrote:
>    I have a project that's currently doing manual command-line  
> parsing, then using a suite of classes I developed to read from  
> multiple formats of configuration files.  In looking at boost  
> libraries, I see that boost::program_options might be something worth  
> using.
> 
>    The first question I have is "what config file formats does it use/ 
> want" ?  I'm still reading all of the docs, so this may become clear,  
> but.
> 
>    The next question is, since this is one of the non-header-only  
> libraries, how hard would it be to pull segments out of the boost  
> distribution to ship with my suite of programs and build it along- 
> side?  Just to get the program_options component.
> 
>    (Though, as a side note, I'm also using Loki::SharedPtr in my  
> project, so if that could be converted to boost::shared_ptr it might  
> be less complicated.  Then again, I'm using some of the more  
> complicated features of SharedPtr, so it's not clear to me that  
> boost::shared_ptr is adequate, which is why I didn't choose it in the  
> first place.)
> 
>    Thanks...  Any advice on taking portions of the boost code and  
> bundling it into another source package would be appreciated.
> 
>                   - Chris
> _______________________________________________
> Boost-users mailing list
> Boost-users_at_[hidden]
> http://lists.boost.org/mailman/listinfo.cgi/boost-users
> 
> 
I use the boost::program_options as it is halfway there to providing
something I've written from scratch in most other languages - a reusable
PropertyCatalog. My C++ implementation is wrapped around
boost::program_options which provides functions like the following:

bool PropertyCatalog::getBooleanProperty(string key, bool defaultValue)
    {
    bool retval = defaultValue;

    if (vm.count(key))
        {
        try
            {
            retval = vm[key].as<bool>();
            }
        catch (...)
            {
            retval = defaultValue;
            }
        }
    return retval;
    }

So anywhere in my code I can do, for example:
    if (PropertyCatalog::getBooleanProperty("testapp.profile",false))
        {
        profile.append(currentStatus);
        }

The actual command-line or INI file parsing is done by the
boost::program_options library - I have merely wrapped it in something I
am used to...
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