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I'm trying to write a cython wrapper for some templated C++ code. I'm pretty familiar with wrapping something written like Bar. i.e. (with details removed)

 ctypedef enum enum_t "enum_t":
 OPT1 "OPT1",
 OPT2 "OPT2",
 OPT3 "OPT3"

 cdef cppclass Bar[A, B, T, ALLOCATOR=*] 

 new Bar[OPT1, OPT2, float]

But I'm having trouble understanding what the practice is for wrapping instances of something like Bar<OPT1, OPT2, T> or Bar<OPT3, OPT4, T> defined below. Could someone point me in the right direction? What I've tried has given me an "OPT1 is ambiguous" error at compilation.

typedef enum

 OPT1, 
 OPT2,
 OPT3,
 enum_t;

template<class T, class Allocator = std::allocator<T> >
class BarBase : public Foo<T, Allocator>, public mpi::MPIObject

 //Generic class methods and variables


template<enum_t A, enum_t B, class T, class Allocator = std::allocator<T> >
 class Bar : public BarBase<T, Allocator>
 
 public:
 private:
 ;

template<typename T>
class Bar<OPT1, OPT2, T> : public BarBase<T>
 
 //Specific class methods here
 

template<typename T>
class Bar<OPT3, OPT4, T> : public BarBase<T>
 
 //Specific class methods here
 

Cython doesn't really support non-type template parameters. In previous questions when using int template parameters I've recommended using "fake" classes with names signed on generate the correct C++ code. The same principle applies here:

cdef extern from "X.hpp": 
 cdef cppclass OPT1:
 pass
 cdef cppclass OPT2:
 pass

 cdef cppclass Bar[A, B, T]:
 pass

def f():
 cdef Bar[OPT1,OPT2,float]* p = new Bar[OPT1,OPT2,float]()

I've simply told Cython that OPT1 and OPT2 are classes rather than enum values and this tricks Cython into generating the correct code.