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POCopy Constructor of Stack using Linked Lists
 

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  1. POCopy Constructor of Stack using Linked Lists
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    <p>First making a copy constructor for linked lists was difficult and now this stack. I almost wanted to hit my head with something but then I thought of Stack Overflow guys. So here is the problem: Consider One thing You can not change the list.h or stack.h or its constructor even. // In list.h</p> <pre><code>template &lt;class T&gt; struct ListItem { T value; ListItem&lt;T&gt; *next; ListItem&lt;T&gt; *prev; ListItem(T theVal) { this-&gt;value = theVal; this-&gt;next = NULL; this-&gt;prev = NULL; } }; /* This is the generic List class */ template &lt;class T&gt; class List { ListItem&lt;T&gt; *head; public: // Constructor List(); // Copy Constructor List(const List&lt;T&gt;&amp; otherList); } // In list.cpp template &lt;class T&gt; List&lt;T&gt;::List() { head=NULL; } template &lt;class T&gt; List&lt;T&gt;::List(const List&lt;T&gt;&amp; otherList) { // I have code working for this part } template &lt;class T&gt; List&lt;T&gt;::~List() { } // In stack.h (includes list.cpp) template &lt;class T&gt; class Stack { List&lt;T&gt; list; public: Stack(); Stack(const Stack&lt;T&gt;&amp; otherStack); ~Stack(); void push(T item); T top(); T pop(); }; // remember top(); pop(); push() functions are working properly in stack.cpp file. // In stack.cpp (includes stack.h) Stack(const Stack&lt;T&gt;&amp; otherStack){ } template &lt;class T&gt; void Stack&lt;T&gt;::push(T item) { } template &lt;class T&gt; T Stack&lt;T&gt;::top() { } template &lt;class T&gt; T Stack&lt;T&gt;::pop() { } </code></pre> <p>there is an object s containing elem from 0 to 100. 100 being on the top. Now we copy something like this:-</p> <pre><code>Stack&lt;int&gt; s2(s); </code></pre> <p>I don't know how on Earth to access otherStack elements. I mean of course its a linked list. But it is in Stack.cpp, what can I do to access it and also how to make a copy constructor for this stack (Working code would be preferable). And Please be supportive this time. Thanks. NOTE: You can't change any constructor. It has to be the way it is. I hope every body this time gets my query.</p>
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    1. USCerebralGarcon
    1. USCerebralGarcon
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    1. COIf your `List`'s copy construct works correctly, then the implicitly generated copy constructor should work fine for your `stack` -- it just contains a `List`, which will be copy constructed using `List(List const &)`.
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      1. POCopy Constructor of Stack using Linked Lists
      1. USJerry Coffin
    2. CO@JerryCoffin You mean something like this:- list.List<T> Stack(otherStack) // this is not working. Error:-> inproper use of function.
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      1. USCerebralGarcon
    3. CONo. He means delete your stack copy constructor declaration and implementation, then just copy one stack to another as you would any other object.
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      1. USBenjamin Lindley
 

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