Re: [Boost-users] shared_ptr and polymorphism

Subject: Re: [Boost-users] shared_ptr and polymorphism
From: Frank Mori Hess (frank.hess_at_[hidden])
Date: 2010-02-23 09:53:15

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On Tuesday 23 February 2010, Abderrahmane Madani wrote:
> void foo(shared_ptr<D1>)        {}
> void foo(shared_ptr<D2>)        {}
>
> int main()
> {
>     shared_ptr<E> e(new E);
>     foo(e);
>     return 0;
> }
> the compiler say that the foo(boost::shared_ptr<E>&)' is ambiguous.
>
> Please, can someone help me to understand why and how can I fix this
> problem without changing the functions name. Thanks
>
> Boost 1.35
> GCC 4.4.1

Your code should work with boost 1.36 or later.  Or, does something like the 
following help?

void foo_impl(shared_ptr<D1>, D1 *)        {}
void foo_impl(shared_ptr<D2>, D2 *)        {}

template<typename T>
void foo(shared_ptr<T> sp)
{
        foo_impl(sp, sp.get());
}
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