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    <p>What your macro does is to declare a specializations of some members of a class. This won't create any object and probably not what you really want anyway. What you'd need is a definition of <code>FactoryHelper&lt;SomeClass&gt;::_helper</code> somewhere. A definition of the static member would look something like this:</p> <pre><code>FactoryHelper&lt;foo&gt; FactoryHelper&lt;foo&gt;::_helper; </code></pre> <p>That said, I don't think the is the the way to go at all: all you really need is to instantiate something which registers a factory function and this can be done much simpler and, especially, without macros.</p> <p>Here is how I would do this:</p> <pre><code>template &lt;typename T&gt; struct factory_helper { std::auto_ptr&lt;base&gt; create_fuction() { return std::auto_ptr&lt;base&gt;(new T()); } factory_helper(std::string const&amp; name) { factory.register_class(name, create_function); } }; </code></pre> <p>This assumes that you want to create objects derived from type <code>base</code> and that your factory uses a mapping to function object returning <code>std::auto_ptr&lt;base&gt;</code> as constructor functions and that it has a <code>register_class()</code> function which takes the name and the constructor function as parameters. Neither of these assumptions is inherent to the apprach, though: this is just to fill in some of the blanks you didn't mention. You would register a factory function for a class <code>foo</code> something like this:</p> <pre><code>static factor_helper&lt;foo&gt; foo_helper("foo"); </code></pre>
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    1. USDietmar Kühl
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