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POFor Looping Link List using Templates
 

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    <p>Having used the various search engines (and the wonderful stackoverflow database), I have found some similar situations, but they are either far more complex, or not nearly as complex as what I'm trying to accomplish.</p> <p><a href="https://stackoverflow.com/questions/5622658/c-list-looping">C++ List Looping</a> <a href="https://stackoverflow.com/questions/550219/link-error-using-templates">Link Error Using Templates</a> <a href="https://stackoverflow.com/questions/12830221/clinked-list-ordering">C++:Linked List Ordering</a> <a href="https://stackoverflow.com/questions/7117844/pointer-address-does-not-change-in-a-link-list">Pointer Address Does Not Change In A Link List</a></p> <p>I'm trying to work with Link List and Node templates to store and print non-standard class objects (in this case, a collection of categorized contacts). Particularly, I want to print multiple objects that have the same category, out of a bunch of objects with different categories. When printing by category, I compare an sub-object tmpCategory (= "business") with the category part of a categorized contact.</p> <p>But how to extract this data for comparison in int main()?</p> <p>Here's what I'm thinking. I create a GetItem member function in LinkList.tem This would initialize the pointer cursor and then run a For loop until the function input matches the iteration number. At which point, GetItem returns object Type using (cursor -> data).</p> <pre><code>template &lt;class Type&gt; Type LinkList&lt;Type&gt;::GetItem(int itemNumber) const { Node&lt;Type&gt;* cursor = NULL; for(cursor = first; cursor != NULL; cursor = (cursor -&gt; next)) { for(int i = 0; i &lt; used; i++) { if(itemNumber == i) { return(cursor -&gt; data); } } } } </code></pre> <p>Here's where int main() comes in. I set my comparison object tmpCategory to a certain value (in this case, "Business"). Then, I run a For loop that iterates for cycles equal to the number of Nodes I have (as determined by a function GetUsed()). Inside that loop, I call GetItem, using the current iteration number. Theoretically, this would let the int main loop return the corresponding Node from LinkList.tem. From there, I call the category from the object inside that Node's data (which currently works), which would be compared with tmpCategory. If there's a match, the loop will print out the entire Node's data object.</p> <pre><code>tmpCategory = "Business"; for(int i = 0; i &lt; myCategorizedContact.GetUsed(); i++) { if(myCategorizedContact.GetItem(i).getCategory() == tmpCategory) cout &lt;&lt; myCategorizedContact.GetItem(i); } </code></pre> <p>The problem is that the currently setup (while it does run), it returns nothing at all. Upon further testing ( cout &lt;&lt; myCategorizedContact.GetItem(i).getCategory() ), I found that it's just printing out the category of the first Node over and over again. I want the overall scheme to evaluate for every Node and print out matching data, not just spit out the same Node.</p> <p>Any ideas/suggestions are greatly appreciated.</p>
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