Is there a way to send an extra parameter between the goout and out typemaps?

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Is there a way to send an extra parameter between the goout and out
typemaps?

I'm taking a look at whether there's any practical way to map
absl::StatusOr<T> (or std::expected) to Golang's "return T, err" pattern.
This requires propagating both an error and a value across the language
boundary.

We can kindly ask the user to make one of those two an output parameter,
but it would be really neat if we could automatically inject an extra
parameter between goout and out that doesn't have any corresponding
parameter in either the Go or C++ client code.

I don't see anything like that in the SWIG docs, but maybe some feature has
been added that isn't in the docs?

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<div dir=3D"ltr"><div>Is there a way to send an extra parameter between the=
 goout and out typemaps?</div><div><br></div>I&#39;m taking a look at wheth=
er there&#39;s any practical way to map absl::StatusOr&lt;T&gt; (or std::ex=
pected) to Golang&#39;s=C2=A0&quot;return T, err&quot; pattern. This requir=
es propagating both an error and a value across the language boundary.<div>=
<br></div><div>We can kindly ask the user to make one of those two an outpu=
t parameter, but it would be really neat if we could automatically inject a=
n extra parameter between goout and out that doesn&#39;t have any correspon=
ding parameter in either the Go or C++ client code.</div><div><br></div><di=
v>I don&#39;t see anything like that in the SWIG docs, but maybe some featu=
re has been added that isn&#39;t in the docs?</div></div>

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