Re: object copy with reference

From:

Werner <werasm@gmail.com>

Newsgroups:

comp.lang.c++

Date:

Mon, 26 Sep 2011 01:32:42 -0700 (PDT)

Message-ID:

<cba16bc2-b538-4b8b-bc5c-99a7a8f52986@u13g2000vbx.googlegroups.com>

On Sep 26, 10:26 am, Werner <wer...@gmail.com> wrote:

How about making mysuperclass a pointer (or a smart pointer of some
kind), then you can initialize it to zero (or in the case of smart_ptr
it happens automatically). I'd use scoped_ptr in this case..., but as
example I'd this use a bald pointer...

[snip]

I've decided to throw in a smart pointer example too:

#include <memory>

struct MySuper
{
  virtual MySuper* clone() const = 0;

  //... rest of interface

  //... lets not forget this...
  virtual ~MySuper() = 0;
};

class Thread
{
  public:
    Thread();
    ~Thread();
    void associate( MySuper& super );

  private:
    std::auto_ptr<MySuper> super_;
};

//x.cpp
void Thread::associate( MySuper& super )
{
  super_.reset( super.clone() );
}

Thread::Thread()
{ }

Thread::~Thread()
{
}

I've used auto_ptr in scoped_ptr's stead just because
for you it might be readily available, whereas scoped_ptr
(or a version thereof) you can get from www.boost.org, but
your version of STL might not support scoped_ptr out of the
box.

Kind regards,

Werner