Re: [Boost-users] polymorphism and boost::shared_ptr

7 Sep 2007

      Hi Michael,

Thanks for the response.  Your solution will indeed work, but the side
effect is that spB and spC only have access to methods available in
the base class.  Imagine that B & C have unique methods that I want to
access in main like.

main()
{

A base;
shPtrB spB(new B());
shPtrC spC(new C());

spB.PrintBrad();        // unique to B
spC.PrintMichael();   // unique to C

// this will fail obviously, but how else can I get access to unique
methods in B & C
base.AddChild(spB);
base.AddChild(spC);
}

Thanks for your help

Brad

On 9/7/07, Michael Fawcett  wrote:
...
On 9/7/07, Brad Ryder  wrote:
...
main()
{
A base;
shPtrB spB(new B());
shPtrC spC(new C());
// I dont want to typecast spB or spC
A.AddChild( (shPtrA) spB);
A.AddChild( (shPtrA) spC);
}
Simply stop using shPtrB and shPtrC, and just use shPtrA.  e.g.,
main()
{
A base;
shPtrA spB(new B());
shPtrA spC(new C());
// works fine
A.AddChild(spB);
A.AddChild(spC);
}
HTH,
--Michael Fawcett
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