Using C++ typedef in cython

[Andrew Nelson]

How do I declare/use a C++ typedef in cython? 

In C++ library code that I want to use:

```
// myfunc.h
// implementation is in myfunc.cpp
typedef std::complex<double> Cplx;
void func(int len, Cplx *val);
```

Now I want to use `func` from cython. In the cython code:

```
cdef extern from "myfunc.h" nogil:
    void func(int len, Cplx *val)
```

But I need to define what `Cplx` is in the cython file, and it's not clear to me how to do that. I'd rather not have to change the original library file.

[da-woods]

ctypedef.

e.g.

cdef extern from "myfunc.h" nogil:

   ctypedef libcpp.complex.complex[double] Cplx
   ...

(assuming you've cimported libcpp.complex)

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