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    <p>Slightly different syntax but...</p> <pre><code>#include &lt;boost/preprocessor.hpp&gt; #include &lt;iostream&gt; void f1(int x, int y, char* z) { std::cout &lt;&lt; "::f1(int,int,char*)\n"; } #define GENERATE_ARG(z,n,unused) BOOST_PP_CAT(arg,n) #define GET_ARGS(n) BOOST_PP_ENUM(n, GENERATE_ARG, ~) #define GENERATE_PARAM(z,n,seq) BOOST_PP_SEQ_ELEM(n,seq) GENERATE_ARG(z,n,~) #define GENERATE_PARAMS(seq) BOOST_PP_ENUM( BOOST_PP_SEQ_SIZE(seq), GENERATE_PARAM, seq ) #define PASSTHROUGH(Classname, Function, ArgTypeSeq) \ void Classname::Function( GENERATE_PARAMS(ArgTypeSeq) ) \ { \ ::Function( GET_ARGS( BOOST_PP_SEQ_SIZE(ArgTypeSeq) ) ); \ } struct test { void f1(int,int,char*); }; PASSTHROUGH(test,f1,(int)(int)(char*)) int main() { test().f1(5,5,0); std::cin.get(); } </code></pre> <p>You could get something closer to yours if you use tuples, but you'd have to supply the arg count to the base function (you can't derive a size from a tuple). Sort of like so:</p> <pre><code>PASSTHROUGH(test,f1,3,(int,int,char*)) </code></pre> <p>That about what you're looking for? I knew it could be done; took about a half hour to solve. You seem to expect that there's an implicit 'this' that has to be gotten rid of but I don't see why...so maybe I misunderstand the problem. At any rate, this will let you quickly make default "passthrough" member functions that defer to some global function. You'll need a DECPASSTHROUGH for the class declaration if you want to skip having to declare them all...or you could modify this to make inline functions.</p> <p>Hint: Use BOOST_PP_STRINGIZE((XX)) to test the output of preprocessor metafunctions.</p>
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    1. POHow can one make a 'passthru' function in C++ using macros or metaprogramming?
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    1. USCrazy Eddie
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    1. COThe 'this' would only be an issue if you were accessing the memory directly. Thanks for the solution, hopefully people here will be ok with including the Boost preprocessor (we're not using Boost, but the PP looks standalone).
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      1. USRyan
    2. COWell, if the people there aren't ok with using boost you could just do what every other C++ dev does when they can't use boost: attempt to write those parts that you really need, do it badly, and lament at the incompetence of your bosses.
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      1. USCrazy Eddie
    3. CO@Ryan: PP is standalone and even works in C. Alternatively you can always extract Boost components with the [bcp](http://www.boost.org/tools/bcp/index.html) tool.
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      1. USGeorg Fritzsche
 

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