Re: [Boost-Users] Re: counted_base vs. sp_counted_base - boost 1.30.0 functionality deprecated

From: Peter Dimov (pdimov_at_[hidden])
Date: 2003-06-09 14:13:01

Anders Hybertz wrote:
[...]
> Just to follow up on my own mail. I have now attached a
> small 'almost' complete example which works in boost 1.29.0
> 
> ------------------------------------------------------------
> #include <iostream>
> #include <boost/shared_ptr.hpp>
> 
> class Test : public boost::counted_base
> {
> public:
>     Test() :  boost::counted_base( 1, 1 )
>     {
>         std::cout << "Test::Test" << std::endl;
> 
>         // Start the thread
>     }
> 
>     void ThreadMethod()
>     {
>         bool active( true );
>         while( active )
>         {
>             // active = someQueue.Pop()
>         }
>         release();
>     }
>     ~Test()
>     {
>         std::cout << "Test::~Test" << std::endl;
>     }
> };
> 
> typedef boost::shared_ptr<Test>         TestPtr;
> 
> int main(int argc, char* argv[])
> {
>     {
>         TestPtr    spTest( new Test );
>     }
> 
>     // Test destructor is not being called even though that it has
> left scope
> 
>     // Stop thread and clean up etc.
> 
>     return 0;
> }
> ------------------------------------------------------------
> 
> The main purpose is that the Test destructor is not called before
> the thread actually finishes.
> 
> Changing boost::counted_base to boost::detail::sp_counted_base for
> boost 1.30.0 does not provide this feature.
> 
> Is there another way I cn ensure that the destructor is never being
> call - but without modifying the interface, the user should not be
> avare of the hidden details.

Can you change

TestPtr spTest(new Test);

to

TestPtr spTest = Test::Create();

?

If you can:

shared_ptr<Test> Test::Create()
{
    shared_ptr<Test> pt(new Test);
    boost::thread th( bind(&Test::ThreadMethod, pt) );
    return pt;
}