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8334471
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0
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2011-11-30T23:24:11.560
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2011-12-01T16:36:38.507
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2011-12-01T16:36:38.507
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please look at boost tuple implementation (solves a similar problem). The main idea is that you can specify a maximum number of template arguments for your FollAll<...>() method, and provide default types for most of them. Here is a sketch of what I have in mind <pre><code>#include <boost/type_traits/is_same.hpp> #include <boost/mpl/eval_if.hpp> #include <boost/mpl/vector.hpp> #include <boost/mpl/push_back.hpp> using boost::is_same; using boost::mpl::eval_if; using boost::mpl::vector; using boost::mpl::push_back; struct EmptyType { }; struct A { template<typename arg1, typename arg2=EmptyType, typename arg3=EmptyType, ..., typename argN=EmptyType> void FooAll() { // reconstruct the type vector for easy manipulation later // Bolierplate code! typedef vector<arg> vector_arg1; typedef typename eval_if<is_same<arg2, EmptyType>, vector_arg1, push_back<vector_arg1, arg2> >::type vector_arg2; typedef typename eval_if<is_same<arg3, EmptyType>, vector_arg2, push_back<vector_arg2, arg3> >::type vector_arg3; //... rest of arguments typedef typename eval_if<is_same<argN, EmptyType>, vector_arg(N-1), push_back<vector_arg(N-1), argN> >::type vector_argN; // now you can manipulate the reconstructed type vector Do_some_internal_stuff<vector_argN>::apply(); } } </code></pre> If you want to go 'high-tech' you can try out a C++11 standard feature named <a href="/http://en.wikipedia.org/wiki/Variadic_template" title="Variadic Templatesquot;">Variadic Templates</a>. But be sure that compilers you are targeting, already support this feature. Best Regards, Marcin
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1. POC++ Boost MPL: how to get rid of vector and callnot internal function?
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1. USMarcin
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1. CO@user1072853 I've updated the example with more details. I did not have access to compiler, so please treat this code only as a sketch.
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