Essential COM

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 // FastStringItf.h  class _declspec(dllexport) FastStringItf {  class FastString;        // introduce name of impl. class        //              FastString *m_pThis;        // opaque pointer (size remains constant)        //     (     )    public :      FastStringItf(const char *psz);      ~FastStringItf(void);      int Length(void) const;        // returns # of characters        //            int Find(const char *psz) const;       // returns offset        //      };  

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 // faststringitf. // (part of DLL, not client) // (  DLL,      ) #include "faststring.h"  #include "faststringitf.h"  FastStringItf::FastStringItf(const char *psz)      : m_pThis(new FastString(psz))    { assert(m_pThis != 0); }  FastStringItf::~FastStringItf(vo1d)    { delete m_pThis; }  int FastStringItf::Length(void) const    { return m_pThis->Length(); }  int FastStringItf::Find(const char *psz) const    { return m_pThis->Find(psz); }  

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