Re: [boost] [smart_ptr/static_pointer_cast] Trying to make ADL useful in my boost libraries

From: Ion Gaztañaga (igaztanaga_at_[hidden])
Date: 2006-06-14 11:39:58

> Have you tried
> 
> #include <boost/pointer_cast.hpp>
> 
> // in class
> 
> {
>     using boost::static_pointer_cast;
>     static_pointer_cast<T>( ps );
> }
> 
> under g++? Does it still fail? This is required to support the case where ps 
> is a raw pointer.

This also fails. Simplified test case:

////////////////////////////////////////
//raw_ptr.hpp header:
////////////////////////////////////////

namespace raw_ptr
{

//static_pointer_cast overload for raw pointers
template<class T, class U>
inline T* static_pointer_cast(U *ptr)
{  return static_cast<T*>(ptr);  }

}  //namespace raw_ptr

////////////////////////////////////////
//container.hpp header:
////////////////////////////////////////

namespace dummy {

template<class Pointer>
class container
{
    public:

    void func()
    {
       using raw_ptr::static_pointer_cast;
       static_pointer_cast<int>(Pointer());
    }
};

}  //namespace dummy {

////////////////////////////////////////
//smart_ptr.hpp header:
////////////////////////////////////////

namespace dummy {

template<class T>
class smart_ptr
{};

template<class T, class U>
smart_ptr<T> static_pointer_cast(const smart_ptr<U> &u)
{  return smart_ptr<T>(); }

}  //namespace dummy {

////////////////////////////////////////
//main.cpp
////////////////////////////////////////

int main()
{
    using namespace dummy;
    typedef container<smart_ptr<int> > my_container;
    my_container cont;
    cont.func();

    typedef container<int *> my_container2;
    my_container2 cont2;
    cont2.func();
    return 0;
}

This compiles fine with with VC 7.1. g++ fails with:
"no matching function for call to 'static_pointer_cast(dummy::smart_
ptr<int>)'"

Regards,

Ion