[boost] [program_options] A couple of proposed changes (patches included)

Subject: [boost] [program_options] A couple of proposed changes (patches included)
From: jcwilson.boost_at_[hidden]
Date: 2010-12-09 23:18:19

I've been making use of this library for the past week and it's 
been very helpful.  I've found a couple of ways to improve it for 
my use and wanted to see if it'd be worth sending the changes 
upstream, too.

1) Allow default value specification at option query time. This 
would override the default value (if any) defined in the 
options_description for this particular query.

  buffer_size = options["buffer_size"].as<unsigned int>(1024);

2) Add the option name as a parameter to the "notifier" function 
signature.  This became necessary when I started using the 
wildcard(*) functionality.  How else am I to know what the matched 
config variable was? I just replaced boost::function1 with 
boost::function2.

I imagine this one would need a bit more work since it would break 
any current users.  I could take a stab at it, but if it seems 
useful, maybe someone more familiar with the library would rather 
take care of it instead.

I'm pretty new to Boost development, so I'm not sure what the next 
steps would be. The attached patches are against the boost_1_45_0 
release.

-Josh