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

From: Vladimir Prus (ghost_at_[hidden])
Date: 2005-05-12 00:57:15

Hi Susan,

> 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))
>     ;

In this context the library expects you to pass a function that takes
'string' and returns nothing. However, you pass a member function, which
has implicit 'this' argument. I'd suggest this:

   #include <boost/bind.hpp>

   .....

        ->notify(boost::bind(&Report::PrintName, this, _1))

HTH,
Volodya