Re: [Boost-users] boost program options cannot accept hex number

From: Sean Huang (huangsean_at_[hidden])
Date: 2006-03-30 09:53:01

----- Original Message ----- 
From: "Peng Yu" <pengyu.ut_at_[hidden]>
>I tried to supply a hex number to an unsigned long integer. But it fails.
>
> ("code", po::value<unsigned long>(), "Via pattern code")
>
> Error message:
> in option 'code': invalid option value '0x5A'
>
> Could you please let me if it is possible to input a hex form integer in 
> the command line?
>

Well, you can but it needs additional work (I am not the library author and 
cannot say if there is a better way). One way is to define your own validate 
overloads in boost::program_options:
namespace boost {

namespace program_options {

template< class CharType, class Traits > void validate( boost::any& v, const 
std::vector< std::basic_string< CharType, Traits> >& xs, unsigned long*, 
long )

{

// code to read the value from xs

// Many iostream implementations support the auto-radix selection by 
clearing the basefield. But it is not portable

}

}

}

HTH,

Sean