Method load

include/pybind11/cast.h:360–365

struct void_caster {
public:
    bool load(handle src, bool) {
        if (src && src.is_none()) {
            return true;
        }
        return false;
    }
    static handle cast(T, return_value_policy /* policy */, handle /* parent */) {
        return none().release();
    }