Re: [boost] Interest in a "non derivable" utility

4 Mar 2007


      AMDG

Manuel Fiorelli <manuel.fiorelli <at> gmail.com> writes:
...
I know that standard C++ prohibits template parameters and typedefs in
friend declarations, thus the only way to eliminate the problem seems to use
an ad-hoc non_derivable helper for each class, but this should require a
less clean approach:
Even though it is prohibited most compilers allow
it.  You might want to look at
http://boost-consulting.com/vault/index.php?&direction=0&order=&directory=Generic%20Programming
...
- Can someone say me what is the reason to use a nested
   namespace....what does it mean "unintended ADL"
namespace boost {
    template<class T0>
    void f(const T0&);
}

namespace my_namespace {

    class A {};

    class B : BOOST_NON_DERIVABLE, public A {};

    void f(const A&);

    void f() {
        B b;
        f(b); //calls boost::f
    }

}

In Christ,
Steven Watanabe