error: reference to non-static member function must be called
FLEXT_ADDMETHOD_S(0,"read",m_read);

Also can someone clarify the difference between the two ways to register methods (ADDMETHOD and CADDMETHOD) ?
Any help will be appreciated.

#include <flext.h>

#if !defined(FLEXT_VERSION) || (FLEXT_VERSION < 400)
#error You need at least flext version 0.4.0
#endif

class hello:

    public flext_base
{

    FLEXT_HEADER(hello,flext_base)
 
public:

    hello();
    
protected:

    void m_read(t_symbol *argument);
    
private:

    FLEXT_CALLBACK_S(m_read)
};

FLEXT_NEW("hello",hello)


hello::hello() {

    
    AddInAnything();
    
    FLEXT_ADDMETHOD_S(0,"read",m_read);

}

void hello::m_read(t_symbol *argument) {
    post("reading argument: %s)",GetString(argument));      
        
}

//! Add a a handler for a method with implicit arguments
#define FLEXT_CADDMETHOD_(CL,IX,M_TAG,M_FUN) \