"ISO C++ forbids declaration of 'operator()' with no type"

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Hi, I've inherited the following C++ code, originally written in the late 1990s, that compiles w/o error on Sun Solaris 5.8 with SUNWspro 4.2 CC. When this same code is compiled with a recent version of g++, however, all 5 of the signatures for 'operator()' are flagged as "ERROR:ISO C++ forbids declaration of 'operator()' with no type".

Any suggestion on how to change the 'operator()' signatures to be complliant with ISO C++?

Thanks!



class FunctionPtrETK;

typedef (FunctionPtrETK::*FP_ETK)(...);

class FunctionPtrETK
{
private:

void *arg1;
void *arg2;
void *arg3;

public:
FP_ETK func;
FunctionPtrETK *object;

FunctionPtrETK(void*, ...);
FunctionPtrETK();

//next 5 lines: ERROR: ISO C++ forbids declaration of `operator()' with no type

operator() ();
operator() (void *);
operator() (void *, void *);
operator() (void *, void *, void *);
operator() (void *, void *, void *, void *);

FunctionPtrETK* convert(void*, ...);
static FunctionPtrETK ptr;
};