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    <p>Try this program:</p> <pre><code>#include &lt;string&gt; #include &lt;iostream&gt; using namespace std; //holds two different datatypes template &lt;typename A, typename B&gt; class data { public: A dataA; B dataB; data* _next; data(){_next = NULL;} data* add(A dataA, B dataB){ this-&gt;dataA = dataA; this-&gt;dataB = dataB; return this; } bool operator&lt;(data&amp; rhs) { if (this-&gt;dataB ==rhs.dataB); return true; return (this-&gt;dataB &lt;rhs.dataB); } data* operator++() { if(this == NULL) return NULL; return _next; } }; //stores an array of the data template &lt;typename A, typename B&gt; class container { data&lt;A, B&gt; **dataArray; int ammount; public: typedef data&lt;A, B&gt; * iterator; container(){ //create dynamic array of pointers dataArray = new data&lt;A, B&gt;*[5]; ammount = 0; } ~container(){ for (int i = 0; i &lt; ammount; i++) { delete dataArray[i]; } } void add(A dataA, B dataB){ data&lt;A, B&gt; *newItem; if (ammount &lt;= 5){ newItem = new data&lt;A, B&gt;(); dataArray[ammount] = newItem-&gt;add(dataA, dataB); if(ammount != 0) { dataArray[ammount -1]-&gt;_next = dataArray[ammount]; } ammount++; } } //basic iterators iterator begin(){ return *dataArray; } iterator end(){ return dataArray[4]; } }; int main(){ string somestuff[] = { "one", "two", "three", "four", "five" }; container&lt;string, int&gt; foo; for (int i = 0; i &lt; 5; i++){ foo.add(somestuff[i], i); } container&lt;string, int&gt;::iterator it = foo.begin(); // why cant i just iterate through each item in the array for (it; *it &lt; *foo.end(); it =++ *it) { if(it != NULL) cout &lt;&lt; "Data A : " &lt;&lt; it-&gt;dataA &lt;&lt; " Data B : " &lt;&lt; it-&gt;dataB &lt;&lt; "\n"; else return 0; } return 0; } </code></pre>
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    1. COThanks for the response, I can only access the first item, anything after that is undefined
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    2. COAh ok could you give me any pointers (bad pun) on how to implement the ++ operator for this
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    3. CO@user1652319 check it now I have edited my answer
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