[boost] Re: enabling ADL even with namespace qualification

From: Daniel Frey (daniel.frey_at_[hidden])
Date: 2004-08-16 08:59:56

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
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eMail: daniel.frey_at_[hidden], web: http://www.aixigo.de