[Boost-users] program_options and ->notify(&your_function)

From: Susan Flynn (imadveng_at_[hidden])
Date: 2005-05-11 07:18:54

Hi,
I'm new to boost (and c++) and I've just started 
using program_options. Great concept and code, it has
saved me a lot of time/effort, thanks.

I am having a problem with the 
->notify(&your_function) in add_options. I get 
a compile error (g++ on redhat):
"invalid use of void expression". 
If I comment out the ->notify(&func) part, the code 
compiles. This is the code:

void Report::PrintName(const string name)
{
    cout << " the log name is " << name << "\n";
}

void Report::InitCmdOpts(void)
{
  try {
    p_opts = new po::options_description("Reporting");
    p_opts->add_options()
      ("log", 
         po::value< string >()
            ->default_value("sys.log")
            ->notify( &Report::PrintName))
    ;
  }
  ...catch code...
}

Any help/ideas appreciated. I'm hoping it's something
simple and my lack of c++ knowledge is showing. I've
already simplified the code and tried several
modifications, but the compile error persists.

thanks,
susan.

        
                
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