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Template Factory

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template factory in modern c++ design

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  1. template
  2. <
  3.    class AbstractProduct,
  4.    typename IdentifierType,
  5.    typename ProductCreator = std::function<AbstractProduct* ( void)>
  6. >
  7. class Factory
  8. {
  9. public:
  10.         bool Register(const IdentifierType& id, ProductCreator creator)
  11.        {
  12.               associations_.insert(
  13.                      AssocMap::value_type(id, creator));
  14.                return true ;
  15.        }
  16.        AbstractProduct* CreateObject( const IdentifierType& id)
  17.        {
  18.                typename AssocMap::const_iterator i =
  19.         associations_.find(id);
  20.                if (i != associations_.end())
  21.               {
  22.                       return ((*i).second)();
  23.               }
  24.  
  25.                return NULL;
  26.        }
  27.  
  28. private:
  29.         typedef map<IdentifierType, ProductCreator> AssocMap;
  30.        AssocMap associations_;
  31. };

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