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POCan we create an Adapter patterns using function pointers?
 

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  1. POCan we create an Adapter patterns using function pointers?
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    <p>I was trying to have an Adapter class, which has a Function Pointer (say <code>fnPtr</code>). And based on different Adaptee classes the <code>fnPtr</code> will be assigned with corresponding adaptee`s function. Following is the code snippet:</p> <pre><code>class AdapteeOne { public: int Responce1() { cout&lt;&lt;"Respose from One."&lt;&lt;endl; return 1; } }; class AdapteeTwo { public: int Responce2() { cout&lt;&lt;"Respose from Two."&lt;&lt;endl; return 2; } }; class Adapter { public: int (AdapteeOne::*fnptrOne)(); int (AdapteeTwo::*fnptrTwo)(); Adapter(AdapteeOne* adone) { pAdOne = new AdapteeOne(); fnptrOne = &amp;(pAdOne-&gt;Responce1); } Adapter(AdapteeTwo adtwo) { pAdTwo = new AdapteeTwo(); fnptrTwo = &amp;(pAdTwo-&gt;Responce2); } void AdapterExecute() { fnptrOne(); } private: AdapteeOne* pAdOne; AdapteeTwo* pAdTwo; }; void main() { Adapter* adpter = new Adapter(new AdapteeOne()); adpter-&gt;AdapterExecute(); } </code></pre> <p>Now the problem I am facing is in the <code>main()</code> function. I am not getting any way to call Adapter<code>s function pointers (</code>fnptrOne<code>and</code>fnptrTwo`). I am getting:</p> <blockquote> <p>error C2276: '&amp;' : illegal operation on bound member function expression</p> </blockquote> <p>along with the previous error message. This could mean that <code>&amp;</code> operator is not able to create a function pointer out of <code>pAdOne-&gt;Responce1</code>.</p> <p>Does it mean that we can<code>t have a function pointer in some</code>ClassA<code>which could point to a non-static function present in another</code>ClassB`?</p>
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    1. USBartoszKP
    1. USAnitesh
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    1. COJust as a hint, you might want to read about [`std::function`](http://en.cppreference.com/w/cpp/utility/functional/function) and [`std::bind`](http://en.cppreference.com/w/cpp/utility/functional/bind). I explain how to use them in [this old answer of mine](http://stackoverflow.com/questions/14189440/c-class-member-callback-simple-examples/14189561#14189561).
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      1. POCan we create an Adapter patterns using function pointers?
      1. USSome programmer dude
    2. COAlso you may want to read [this](http://www.parashift.com/c++-faq/pointers-to-members.html).
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      1. USBartoszKP
 

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