ACE/examples/Smart_Pointers/Gadget_Part_Impl.cpp

   1 /* -*- C++ -*- */
   2 //=============================================================================
   3 /**
   4  *  @file    Gadget_Part_Impl.cpp
   5  *
   6  *  @author Christopher Kohlhoff <chris@kohlhoff.com>
   7  */
   8 //=============================================================================
   9
  10 #include "Gadget_Part_Impl.h"
  11 #include "ace/ACE.h"
  12 #include "ace/Log_Msg.h"
  13 #include "ace/Unbounded_Queue.h"
  14
  15 Gadget_Part_Impl::Gadget_Part_Impl (Gadget_ptr owner,
  16                                     const char* name,
  17                                     int size)
  18   : owner_ (owner),
  19     name_ (ACE::strnew (name)),
  20     size_ (size)
  21 {
  22   ACE_DEBUG ((LM_DEBUG, "Gadget_Part_Impl constructor\n"));
  23 }
  24
  25 Gadget_Part_Impl::~Gadget_Part_Impl ()
  26 {
  27   ACE_DEBUG ((LM_DEBUG, "Gadget_Part_Impl destructor\n"));
  28
  29   delete [] name_;
  30 }
  31
  32 void Gadget_Part_Impl::print_info ()
  33 {
  34   ACE_DEBUG ((LM_INFO, "Gadget part: name=%s size=%d\n", name_, size_));
  35 }
  36
  37 void Gadget_Part_Impl::remove_from_owner ()
  38 {
  39   // Need to guarantee the existence of the owner for the duration of this call.
  40   Gadget_var owner = owner_;
  41
  42   // Weak pointers are automatically set to NULL if the object they refer to
  43   // is deleted. We can use this fact to check that our owner still exists.
  44   if (owner == 0)
  45     return;
  46
  47   // Take all existing parts from the owner and build up a temporary list. If
  48   // we find ourselves then we won't add ourselves to the list.
  49   ACE_Unbounded_Queue<Gadget_Part_var> parts;
  50   for (;;)
  51     {
  52       Gadget_Part_var part = owner->remove_part ();
  53       if (part == 0)
  54         break;
  55       if (part != this)
  56         parts.enqueue_tail (part);
  57     }
  58
  59   // Add the remaining parts back to the gadget.
  60   while (!parts.is_empty ())
  61     {
  62       Gadget_Part_var part;
  63       parts.dequeue_head (part);
  64       owner->add_part (part);
  65     }
  66 }