How to use SWIG with "using"

I am attempting to use SWIG 2.0.4 on a C++ library, I have the following in my .i file:

%module coh
%{
#include "coherence/lang.ns"
#include "coherence/net/CacheFactory.hpp"
#include "coherence/net/NamedCache.hpp"
%}

%include "coherence/lang.ns"
%include "coherence/net/CacheFactory.hpp"
%include "coherence/net/NamedCache.hpp"

I swig it with:

$ swig -c++ -ocaml -I/opt/coherence-cpp/include coh.i
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But get the error message:

/opt/coherence-cpp/include/coherence/net/CacheFactory.hpp:31: Error: Syntax error in input(1)

Line 31 of that file is:

using coherence::run::xml::XmlElement;

Is the using keyword not supported? Is there a workaround for this, or should I just write a C++ wrapper of my own, and SWIG that instead? Thanks!

UPDATE: I decided to write my own wrapper (and in future, to take a different approach from the start).

MSDN has this to say:

Note the difference between the using directive and the using declaration : the using declaration allows an individual name to be used without qualification, the using directive allows all the names in a namespace to be used without qualification.

(I'm guessing that) SWIG supports the "using directive" but not the "using declaration".

That is to say, you can use:

using namespace somenamespace::mynamespace;

But you can't use:

using somenamespace::mynamespace::MySymbol;

using in C++ headers is a bad practice, as it gets propagated to other inclusions, so the fact that SWIG doesn't support them is not a big deal.

Better remove using in your headers, and continue to SWIG!

SWIG does support "using declarations". Your syntax error needs further diagnosis. I suggest looking at the preprocessed output using

$ swig -E -c++ -ocaml -I/opt/coherence-cpp/include coh.i

I decided in the end not to use SWIG for this.

SWIG 3.0.11 added support for C++11 type aliasing with using keyword.

https://sourceforge.net/p/swig/news/2016/12/swig-3011-released/