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PO
 

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  1. PO
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    <p>maybe the following aproach with a lokup table will be a nice solution.</p> <p>(Note: I don't know wich compiler are you using, so this solution is for c++03, you could take unordered_map instead map if you are using a compiler with c++11 support)</p> <p>(Note 2: You could use smart pointers too, and take care of the returns values, whit this example I only wants to show an aproach)</p> <pre><code>#include &lt;iostream&gt; #include &lt;string&gt; #include &lt;map&gt; #include &lt;vector&gt; struct ClassMaker { virtual void* getInstance() const = 0; virtual ~ClassMaker() {} }; class Factory { private: std::map&lt;std::string, ClassMaker*&gt; lokupTable; typedef typename std::map&lt;std::string, ClassMaker*&gt;::iterator Iterator; public: void addClass(const std::string&amp; key, ClassMaker* const newClassMaker) { lokupTable[key] = newClassMaker; } void* create(const std::string&amp; key) { void* result = NULL; Iterator it = lokupTable.find(key); if(it != lokupTable.end()) result = (it-&gt;second)-&gt;getInstance(); return result; } void releaseTable() { for (Iterator it = lokupTable.begin(); it != lokupTable.end(); ++it) delete it-&gt;second; } }; struct IntCreator : public ClassMaker { void* getInstance() const { return new int; } }; struct StringCreator : public ClassMaker { void* getInstance() const { return new std::string; } }; int main() { Factory myFactory; myFactory.addClass("int", new IntCreator); myFactory.addClass("string", new StringCreator); int* myInt = reinterpret_cast&lt;int*&gt;(myFactory.create("int")); *myInt = 10; std::cout&lt;&lt; *myInt &lt;&lt; std::endl; delete myInt; myFactory.releaseTable(); return 0; } </code></pre>
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    1. POC++ generic object factory by string name
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    1. UShidrargyro
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    1. COPlease read the description of the problem. This does not conform to it. Thanks
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      1. USyiown
    2. COOne of your "not have points" is: "Full class name listing: more classes could be added later and should not incur in changes to this factory." With this aproach the Factory never changes, you can add new classes with a single method
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      1. UShidrargyro
    3. COIt is the same as the approach I described, except it does not template the factories and a whole polymorphic class instead of a single factory function is used (which complicates things as it requires memory management for the instances created thereof). To my understanding, this also conforms to the specification, though.
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      1. USAlexander Gessler
 

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