Shared Pointers

• This starts on page 186
• reference
• Shared pointers allow multiple pointers to the same object.
  • Most likely, they have a reference count.
  • Creation sets the reference count to 1
  • A copy sets the reference count +1
  • A delete sets the reference count -1
  • Assignment to another pointer decreases or increases the reference count appropriately
  • When the refence count is 0, the memory is deleted.
  • make_shared
  • Created with make_shared
    • reference
  • Most of the member functions of the unique pointer.
  • Take a look at balloon.cpp