Re: Two parent classes each with boost::enable_shared_from_this

In article <eskaje$nj$1@inews.gazeta.pl>, <"limcore@gazeta.pl"> wrote:


   well if
   struct A1 {};
   struct A2{};
   struct B:A1,A2{};
   struct C:B,boost::enable_shared_from_this<C>
   {
      void foo()
      {
         boost::shared_ptr<A1> a1=shared_from_this();
         //...
         boost::shared_ptr<A2> a2=shared_from_this();
         // ...
         boost::shared_ptr<C> c = shared_from_this();
         // ...
      }
   };

  this works but no virtual hellos to prevent the which hello problem.
<begin code>
#include <boost/shared_ptr.hpp>
#include <boost/enable_shared_from_this.hpp>
#include <exception>
#include <iostream>

struct Base
{
   virtual ~Base(){}
};

struct A1:public virtual Base
{
   void hello() {std::cout << "A1\n";}
};

struct A2:public virtual Base
{
   void hello() {std::cout << "A2\n";}
};

struct B: public A1,public A2
{
   void hello() {std::cout << "B\n";}
};

class C:public B,public boost::enable_shared_from_this<C>
{
public:
   void foo()
   {
      boost::shared_ptr<A1> a1 = this->shared_from_this();
      a1->hello();
      boost::shared_ptr<A2> a2 = this->shared_from_this();
      a2->hello();
      boost::shared_ptr<Base> base = this->shared_from_this();
      boost::shared_ptr<B> b = this->shared_from_this();
      b->hello();
      boost::shared_ptr<C> c = this->shared_from_this();
   }
};

int main() try
{
   boost::shared_ptr<C> c(new C);
   c->foo();
   std::cout << "done\n";
}
catch(std::exception const &x)
{
   std::cerr << x.what() << '\n';
}

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