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POAbout wrap and call C function
 

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    <p>I get this question from this Chinese blog <a href="http://chenyufei.info/blog/2011-02-28/wrap-c-function-closure-gcc-nested-function/" rel="nofollow">http://chenyufei.info/blog/2011-02-28/wrap-c-function-closure-gcc-nested-function/</a> The author want to use closure in c language, and he found GCC has the ability of nested function (and closure). For example:</p> <pre><code>typedef int (*func_t)(int arg); int foo(int a) { return a + 1; } func_t create_wrap_function(func_t f) { int wrapped(int arg) { // call original function int val = f(arg); fprintf(log_func_call, "arg: %d ret: %d", arg, val); return val; } return wrapped; } </code></pre> <p>But it is not common solution. create_wrap_function has fixed function format, because the func_t limits the format.</p> <p>As we know, Lua has closure, and could call C function too. What I want to implement like: The functions we want to call is foo1 and foo2, they has different types of args and return value.</p> <pre><code>int foo1(int a) { ... return intValue; } double foo2(char* str, double a) { ... return dblValue; } </code></pre> <p>In C client, call the function like:</p> <pre><code>lua_returnValue returnValue1 = Do_Lua_Wrap(__FILE__, __LINE__, foo1, 1); lua_returnValue returnValue2 = Do_Lua_Wrap(__FILE__, __LINE__, foo2, "string data", 1.2345); </code></pre> <p>In the Do_Lua_Wrap, it will pass the foo1 and 1 to the Lua function, then call foo1 function like normal process. Then pass the foo2 and one char* and one double value to the Lua function, then call foo2 function like normal process. In the Lua function, it could log the information about <strong>FILE</strong> and <strong>LINE</strong> and write some extra log about function arguments.</p> <p>But I don't have idea about how to write the function Do_Lua_Wrap in C and Lua, Is it possible? </p> <p>If possible, could you give me some advices?</p>
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