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POcasting PyCFunctionWithKeywords in PyMethodDef
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  1. POcasting PyCFunctionWithKeywords in PyMethodDef
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    copied!<p>Recently I've been wrapping a lot of C++ code in python, and I find this block (taken directly from the <a href="http://docs.python.org/extending/extending.html#a-simple-example%5d" rel="nofollow">python documentation</a>) a bit troubling: </p> <pre><code>static PyMethodDef keywdarg_methods[] = { /* The cast of the function is necessary since PyCFunction values * only take two PyObject* parameters, and keywdarg_parrot() takes * three. */ {"parrot", (PyCFunction)keywdarg_parrot, METH_VARARGS | METH_KEYWORDS, "Print a lovely skit to standard output."}, {NULL, NULL, 0, NULL} /* sentinel */ }; </code></pre> <p>The issue is the line which casts <code>kwarg_parrot</code>, of type <code>PyCFunctionWithKeywords</code> to a <code>PyCFunction</code>. </p> <p>Coming from a C++ background (and given that I am wrapping C++ code), it seems wrong to use a C-style cast. I've tried <code>static_cast</code>, and <code>dynamic_cast</code>, both of which cause the compiler to complain (with good reason, this really is an unsafe cast in the general sense). The only viable C++ option seems to be<code>reinterpret_cast</code>, but so far as I can tell this is a more verbose version of a C-style cast.</p> <p>Granted, the above <em>is</em> wrapped in an <code>extern "C"</code> block, so maybe the C way is the correct way. Does anyone have any better ideas? (What I'd really like to see would be a solution that could automatically generate the doc string based on the keywords.) </p> <p>Unfortunately, solutions like Boost.Python and SWIG are off the table. (I'm working within an ugly framework)</p>
 

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