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    <p>You're converting a <code>map&lt;string,string&gt;</code> to a <code>void**</code>, returning it then converting it back to a <code>map&lt;string,string</code>. Why not just return a <code>map&lt;string,string&gt;</code>? It's also called <code>string2map</code> which implies you will only ever call it with a string (backed up by the fact you pass in a string, which is converted to a <code>void**</code> then converted straight back). Unless you have a good reason to convert to and from <code>void**</code> all over the place this is probably what you need:</p> <pre><code>#include &lt;string&gt; #include &lt;iostream&gt; #include &lt;map&gt; using namespace std; map&lt;string, string&gt; string2map(string st){ map&lt;string, string&gt; result = map &lt;string, string&gt;(); //code doesnt matter return result; } int main(){ string test = "hello:there;how:are you?"; map&lt;string, string&gt; result = string2map(test); return 0; } </code></pre> <p><strong>EDIT:</strong> </p> <p>I've just reread your question. You might want to look up Generalised Functors and look at Boost's <code>std::function</code> as possible solutions to this problem. It's possible to change the return type of a function via a wrapper class, something like:</p> <pre><code>template&lt; class T &gt; class ReturnVoid { public: ReturnVoid( T (*functor)() ) : m_functor( functor ) {} void operator() { Result = functor(); } private: T (*m_functor)(); T Result; }; // Specialise for void since you can't have a member of type 'void' template&lt;&gt; ReturnVoid&lt; void &gt; { public: ReturnVoid( T (*functor)() ) : m_functor( functor ) {} void operator() { functor(); } private: T (*m_functor)(); }; </code></pre> <p>Using this as a wrapper might help you store functors with different return types in the same array.</p>
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