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POGenerating boost bind expressions
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  1. POGenerating boost bind expressions
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    copied!<p>I have the following code (or something equivalent to this) to generate bind expressions. I use these expressions along with boost.function_types &amp; luabind.tag_function to expose some functions in our framework to lua.</p> <pre><code>#define BOOST_BIND_ARG(J, I, D) BOOST_PP_CAT(_, BOOST_PP_INC(I)) #define MAKE_BIND_EXPR_GEN(_, N, __) \ template &lt; &gt; \ struct MakeBindExpr &lt; N &gt; \ { \ template &lt; typename FP &gt; \ struct result \ { \ typedef BOOST_TYPEOF_TPL(boost::bind( \ FP(0), BOOST_PP_ENUM(N, BOOST_BIND_ARG, BOOST_PP_EMPTY) \ )) type; \ }; \ \ template &lt; typename FP &gt; \ static typename result &lt; FP &gt;::type get(FP const &amp; f) \ { \ return boost::bind(f, BOOST_PP_ENUM(N, BOOST_BIND_ARG, BOOST_PP_EMPTY)); \ } \ }; \ BOOST_PP_REPEAT_FROM_TO(0, 9, MAKE_BIND_EXPR_GEN, _) </code></pre> <p>This is working. However, is there a less ugly way of implementing MakeBindExpr?</p> <p>The following is what I am able to do now... if you are interested to know...</p> <pre><code>// N is arity // F is function type // FP is function pointer type template &lt; typename N, typename FP &gt; typename MakeBindExpr &lt; N &gt;::template result &lt; FP &gt;::type makeBindExpr(FP const &amp; fp); // FP is a function pointer type template &lt; typename FP &gt; void bind2Lua(char const * const fname, FP const &amp; f) { namespace ft = boost::function_types; using ft::function_type; using ft::function_arity; typedef function_type &lt; FP &gt;::type F; typedef function_arity &lt; F &gt;::type Arity; luabind::tag_function &lt; F &gt;(makeBindExpr &lt; Arity::value &gt;::template get(f)); } deque &lt; string &gt;(string const &amp;, string const &amp;); bind2Lua("names", getNames); </code></pre>
 

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