Re: [boost] [smart_ptr] make_shared usage

From: Frank Mori Hess (frank.hess_at_[hidden])
Date: 2008-07-28 08:52:45

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On Monday 28 July 2008 04:12 am, Daniel Frey wrote:
> On Sun, 2008-07-27 at 18:25 +0300, Peter Dimov wrote:
> > You should be able to make it work by making the appropriate make_shared
> > overload a friend:
> >
> >  template< class T, class A1, class A2 >
> >  friend
> >  boost::shared_ptr< T > boost::make_shared( A1 const & a1, A2 const & a2
> > );
>
> Good idea, thanks. It would also render create() useless, since the user
> could call make_shared directly. Sadly, it doesn't work for me. I've
> tried it with GCC 4.3:
>
> #include <memory>
>
> class A
> {
> private:
>   A() {}
>
> public:
>   static std::shared_ptr< A > create()
>   { return std::make_shared< A >(); }
>
>   template< typename... Args >
>   friend std::shared_ptr< A > std::make_shared( Args... );

I don't think the zero-argument call to make_shared resolves to the variadic 
template, see the make_shared.hpp file.

> };
>
> int main()
> {
>   A::create();
> }
>
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