How to tell SWIG about variables of class C ++ float *?

Question

I am trying to use SWIG to create a C # computer for C ++ code, similar to the following:

class blah { ... public: float *getVarA() { return a; } private float *a; ... } 

In my interface file, I use the following% apply:

 %apply float OUTPUT[] { float *getVarA() } 

This causes the C # shell to return float [], but the shell function does not know what float * a is. This causes a lot of errors:

 Cannot implicitly convert type 'float[]' to 'System.IntPtr' 

Wrapper function created:

 public float[] getVarA() { IntPtr cPtr = SpectrumPINVOKE.blah_getVarA(swigCPtr); SWIGTYPE_p_float ret = (cPtr == IntPtr.Zero) ? null : new SWIGTYPE_p_float(cPtr, false); return ret; } 

When using types without pointers, such as:

 class blah { ... public: int getVarB() { return b; } private: int b; ... } 

I get good

 public int getVarB() { int ret = SpectrumPINVOKE.blah_getVarB(swigCPtr); return ret; } 

I read the 2.0 documentation more than I would like, but somewhere I am missing something, and I cannot find it right now. Thanks.