factory.h

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#ifndef FACTORY_INCLUDED
#define FACTORY_INCLUDED
 
#include <type_traits>
 
namespace Util
{
    template< typename BaseType >
    class BaseFactory
    {
        std::vector< BaseType * > _baseTypes;

        virtual BaseType *_create( void ) = 0;
 
    public:
        virtual ~BaseFactory( void ){ for( int i=0 ; i<_baseTypes.size() ; i++ ) delete _baseTypes[i]; }

        BaseType *create( void )
        {
            BaseType *baseType = _create();
            _baseTypes.push_back( baseType );
            return baseType;
        }

        template< typename DerivedType >
        BaseType *create( void )
        {
            static_assert( std::is_base_of< BaseType , DerivedType >::value , "[ERROR] BaseType must be base of DerivedType" );
            BaseType *baseType = new DerivedType();
            _baseTypes.push_back( baseType );
            return baseType;
        }
    };

    template< typename BaseType , typename DerivedType >
    class DerivedFactory : public BaseFactory< BaseType >
    {
        static_assert( std::is_base_of< BaseType , DerivedType >::value , "[ERROR] BaseType must be base of DerivedType" );

        // BaseFactory< BaseType > methods //
        BaseType *_create( void ){ return new DerivedType(); }
    };
}
#endif // FACTORY_INCLUDED