[boost] Re: enabling ADL even with namespace qualification

16 Aug 2004


      Thorsten Ottosen wrote:
...
namespace A
{
    namespace detail
    {
       template< typename T >
       void f( const T& )
       {
          std::cout << 1 << std::endl;
       }
template< typename T >
       void adl_f( const T& x )
       {
          f( x );
       }
    }
template< typename T >
    void f( const T& x )
    {
       detail::adl_f( x );
    }
// this is bad!!
    struct C {};
I assume you have control over namespace A, thus you can add:

       void f( const C& x )
       {
          detail::f( x );
       }

and the problem is gone. Is this a feasible solution for you?
...
}
namespace B
{
    class C {};
void f( const C& )
    {
       std::cout << 2 << std::endl;
    }
}
int main()
{
    A::f( 42 );
A::C c0;
    A::f( c0 ); // error!
B::C c;
    A::f( c );
}
Regards, Daniel

-- 
Daniel Frey

aixigo AG - financial solutions & technology
Schloß-Rahe-Straße 15, 52072 Aachen, Germany
fon: +49 (0)241 936737-42, fax: +49 (0)241 936737-99
eMail: daniel.frey@aixigo.de, web: http://www.aixigo.de