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POgraph inheritance
 

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    <p>I have implemented the following class </p> <pre><code>class graph { friend ostream&amp; operator&lt;&lt; (ostream&amp;, graph&amp;); public: graph() { } ~graph() { clearMap(); } class node { friend ostream&amp; operator&lt;&lt; (ostream&amp;, const graph::node&amp;); public: node() { } node(const node&amp;); node(luint inID) { ID = inID; } virtual ~node() { neighbors.clear(); } node&amp; operator=(const node&amp;); void addNeighbor(luint); void addNeighbor(const std::vector&lt;luint&gt;&amp; ); luint ID; std::vector&lt;luint&gt; neighbors; }; void addNode(const node&amp;); void addNode(const node*); void addNode(luint); void readFile(const char * ); void clearMap(); void randGeom(luint, double); void connRandGeom(luint, double); bool isConnected(); protected: std::map&lt;luint, node*&gt; nodeMap; }; </code></pre> <p>and created a new one, inherited from graph</p> <pre><code>class colorGraph : public graph { public: colorGraph() { } ~colorGraph() { } class colorNode : public graph::node { public: colorNode() { } ~colorNode() { } luint color; }; }; </code></pre> <p>However, the following main program does not find the proper function:</p> <pre><code>int main() { pColorGraph myGraph; myGraph = new colorGraph(); myGraph-&gt;isConnected(); return 0; } </code></pre> <blockquote> <p>Undefined symbols:<br> "graph::isConnected()", referenced from: _main in main.o ld: symbol(s) not found collect2: ld returned 1 exit status</p> </blockquote> <p>can someone tell me what am I doing wrong?</p> <p>Thank you,</p>
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