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copied!<p>You are trying to pass <code>SmartPtr</code> as a template <em>type</em> argument to <code>ThreadingModel</code>. <code>SmartPtr</code> however is a template, not a concrete type, and the <a href="http://books.google.de/books?id=EotSAwuBkJoC&pg=PA126&lpg=PA126&dq=c%2B%2B+injected+class-name&source=bl&ots=iwOYJ9_hgh&sig=7-6UMoMHZctldpOYPvDucV4bXE8&hl=de&ei=YMRkTLuvEeacOLC4gKoK&sa=X&oi=book_result&ct=result&resnum=4&ved=0CCkQ6AEwAw#v=onepage&q=c%2B%2B%20injected%20class-name&f=false" rel="noreferrer">injected class-name</a> is not available in the inheritance list. </p> <p>Also note that you can't just use default arguments for template parameters in arbitrary positions (<em>§14.1/11</em>): </p> <blockquote> <p>If a template-parameter has a default template-argument, all subsequent template-parameters shall have a default template-argument supplied.</p> </blockquote> <p>Your code with those issues fixed:</p> <pre><code>template < class T, template <class> class ThreadingModel, template <class> class CheckingPolicy = EnsureNotNull > class SmartPtr : public CheckingPolicy<T> , public ThreadingModel<SmartPtr<T, ThreadingModel, CheckingPolicy> > // ^ .... now passing a concrete class .... ^ { T* operator->() { // the following use of SmartPtr is fine as it is the injected class-name: typename ThreadingModel<SmartPtr>::Lock guard(*this); // ... } }; </code></pre> <p>Note that while <em>Modern C++ Design</em> is an excellent book, it can't replace a good basic book on templates like <a href="http://www.josuttis.com/tmplbook/" rel="noreferrer">Vandevoorde/Josuttis</a>.</p>

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