How to clone object in C Or Is there another solution

Question

I wrote a Stack and Queue implementation  Linked List based   There is one stack  bigStack   For example  I separate bigStack  example  stackA and stackB   I pop   a node from bigStack  I push   in stackA  In the same way  I push   in stackB  I want bigStack to not change  Therefore I want to clone the bigStack object  How do I clone objects in C    Or is there another solution to my problem   class Stack   public List   public     Stack         Stack const Stack amp  rhs        Stack amp  operator  const Stack amp  rhs           Stack           int Top             if  head    NULL                cout  lt  lt   Error  The stack is empty    lt  lt  endl              return -1            else               return head- gt nosu                       void Push int nosu  string adi  string soyadi  string bolumu            InsertNode 0  nosu  adi  soyadi  bolumu              int Pop             if  head    NULL                cout  lt  lt   Error  The stack is empty    lt  lt  endl              return -1            else               int val   head- gt nosu              DeleteNode val               return val                       void DisplayStack void         then     Stack copyStack   veriYapilariDersi  copyStack DisplayStack

User · Answer

If your object is not polymorphic  and a stack implementation likely isn t   then as per other answers here  what you want is the copy constructor   Please note that there are differences between copy construction and assignment in C    if you want both behaviors  and the default versions don t fit your needs   you ll have to implement both functions   If your object is polymorphic  then slicing can be an issue and you might need to jump through some extra hoops to do proper copying   Sometimes people use as virtual method called clone   as a helper for polymorphic copying   Finally  note that getting copying and assignment right  if you need to replace the default versions  is actually quite difficult   It is usually better to set up your objects  via RAII  in such a way that the default versions of copy assign do what you want them to do   I highly recommend you look at Meyer s Effective C    especially at items 10 11 12

User · Answer

The typical solution to this is to write your own function to clone an object   If you are able to provide copy constructors and copy assignement operators  this may be as far as you need to go   class Foo    public    Foo      Foo const Foo amp  rhs       copy construction from rhs       Foo amp  operator  const Foo amp  rhs                  Foo orig  Foo copy   orig      clones orig if implemented correctly   Sometimes it is beneficial to provide an explicit clone   method  especially for polymorphic classes   class Interface   public    virtual Interface  clone   const   0      class Foo   public Interface   public    Interface  clone   const   return new Foo  this         class Bar   public Interface   public    Interface  clone   const   return new Bar  this          Interface  my foo      somehow construct either a Foo or a Bar     Interface  copy   my foo- gt clone      EDIT   Since Stack has no member variables  there s nothing to do in the copy constructor or copy assignment operator to initialize Stack s members from the so-called  right hand side   rhs    However  you still need to ensure that any base classes are given the opportunity to initialize their members   You do this by calling the base class   Stack const Stack amp  rhs     List rhs      calls copy ctor of List class      Stack amp  operator  const Stack amp  rhs       List  operator  rhs     return   this

User · Answer

In C   copying the object means cloning  There is no any special cloning in the language   As the standard suggests  after copying you should have 2 identical copies of the same object   There are 2 types of copying  copy constructor when you create object on a non initialized space and copy operator where you need to release the old state of the object  that is expected to be valid  before setting the new state

[c++] How to clone object in C++ ? Or Is there another solution?

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