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POC++: Templates - No Matching Function to call
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  1. POC++: Templates - No Matching Function to call
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    copied!<p>I have an Object Factory Class which has a method called registerCreator as defined below:</p> <pre><code>template &lt; class Base, class Key, typename ObjectCreator = Base* (*)()&gt; class ObjectFactory { public: bool registerCreator( const Key&amp; id, ObjectCreator creator) { return associations_.insert( typename IdToObjectMap::value_type(id, creator)).second != 0; } ... private: typedef std::map&lt;Key, ObjectCreator&gt; IdToObjectMap; IdToObjectMap associations_; }; </code></pre> <p>This class is wrapped in a singleton Holder which is essentially implemented following the Loki::SingletonHolder.</p> <p>I have created a typedef to this as:</p> <pre><code>typedef SingletonHolder &lt; ObjectFactory &lt; AbstractResource, const char*, AbstractResource* (*)()&gt; &gt; ResourceFactory; </code></pre> <p>AbstractResource is an empty class for now. I have used another ResourceBase class as follows to help with static polymorphism.</p> <pre><code>template &lt;class DerivedType&gt; class ResourceBase { public: virtual ~ResourceBase(); static bool registerWithFactory(); protected: ResourceBase(); private: static const bool _Initialized; }; </code></pre> <p>// this also includes its .C implementation which is as follows:</p> <pre><code>template &lt;class DerivedType&gt; const bool ResourceBase&lt;DerivedType&gt;::_Initialized = ResourceBase&lt;DerivedType&gt;::registerWithFactory(); template&lt;class DerivedType&gt; bool ResourceBase&lt;DerivedType&gt;::registerWithFactory() { if (! _Initialized) { return ResourceFactory::Instance().template registerCreator&lt;DerivedType&gt; (DerivedType::className() , &amp;DerivedType::allocate); } } </code></pre> <p>and then my concrete class is as follows: class FileManager : public ResourceBase, AbstractResource { public: FileManager(); ~FileManager() { }</p> <pre><code> static const char* className(); static AbstractResource* allocate(); }; </code></pre> <p>With FileManager implementation as:</p> <pre><code>const char* FileManager::className() { return "FileManager"; } AbstractResource* FileManager::allocate() { return new FileManager; } </code></pre> <p>on compilation, I am getting:</p> <pre><code>error: no matching function for call to `ObjectFactory&lt;AbstractResource, const char*, AbstractResource*(*)()&gt;::registerCreator(const char*, AbstractResource*(*)())' </code></pre> <p>Can anyone please suggest what is the issue here? I am missing something very basic as it appears.</p>
 

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