I'm expecting a numpy.random.RandomState object to be passed to me. I want to
check it is. The best I could think of is below. Anything more boost::python-
ish to do this task?
static object rs_obj;
template<typename out_type=uint32_t>
struct engine {
typedef out_type result_type;
bp::object rs; // RandomState object
void verify (object const& o) {
if (!PyObject_IsInstance(o.ptr(), rs_obj.ptr()))
throw std::runtime_error ("engine: expected RandomState");
}
engine (bp::object const& _rs) : rs (_rs) { verify (_rs); }
...
BOOST_PYTHON_MODULE...
object mod = object (handle<> ((PyImport_ImportModule("numpy.random"))));
rs_obj = mod.attr("RandomState");
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