Re: [boost] [parameter] BOOST_PARAMETER_CONSTRUCTOR bug

Subject: Re: [boost] [parameter] BOOST_PARAMETER_CONSTRUCTOR bug
From: James Hirschorn (james.hirschorn_at_[hidden])
Date: 2013-05-21 17:29:29

Nathan Crookston wrote:

> James Hirschorn wrote:
> 
> I believe when you have an optional constructor parameter, you must access
> it with the default value supplied:
> 
> struct myclass_impl
> {
>     template <class ArgumentPack>
>     myclass_impl(ArgumentPack const& args)
>     {
>         std::cout << "name = " << args[_name | ""]
>                   << "; index = " << args[_index | 0]
>                   << std::endl;
>     }
> };
> 
> (Note the bitwise or "|").  This is a little different than for named
> function parameters, it seems.
> 
> HTH,
> Nate
> 

Yes, that works. I should have checked here before making the report...

Thanks,
James