In class filter.h, I have the following forward declaration

#include "nonlinear.h"

template<class T> //Forward declaration due to circular dependency
class Agc;

//class QuantizerCmplx;

I get the following errors while compiling with g++.

../source/filter.h: In member function âint FarrowFilter<T>::filter_quantize()â:
../source/filter.h:1837: error: invalid use of undefined type âstruct QuantizerCmplxâ
../source/filter.h:12: error: forward declaration of âstruct QuantizerCmplxâ

The compiler is complaining about the following lines
stage1QuantizeWirein=new Wire<T>;
stage1QuantizeWireout=new Wire<T>;
stage1QuantizeSetup = new FixPt( X, X-2, "r", _YES);
stage1Quantize=new QuantizerCmplx(-100046, stage1QuantizeSetup,stage1QuantizeWirein,stage1QuantizeWireout);

It is not able to find QuantizerCmplx even though it is declared in nonlinear.h which I have included. If I use a forward declaration(commented line on top) it compiles with VC++ but gives an error with g++

How do I solve this problem

Thanks

I already responded to this thread in the other forum. Please don't crosspost