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How to make a template class a friend?

Posted on 2006-07-10
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Last Modified: 2013-11-17
template<class T> struct plotvalue : public std::unary_function<T, void>
{
  plotvalue(//GraphHandler& g) : gh(g) {}
  void operator() (T x) {
        if(x.Param_code == 0x00000002) {
                double time = (x.Time - gh.start_time)/60;
                gh.series.AddXY(time, x.Measure_Value);
         }
  }
  GraphHandler& gh;
};
//---------------------------------------------------------------------------
class GraphHandler {
        friend template<class T> struct plotvalue : public std::unary_function<T, void>
        public:
                GraphHandler(TCustomSeries& s, TChart& c, TChartEditor& ce);
                void plot(MessageHandler& mh, TCustomSeries* series);
        private:
                bool first_time;
                TCustomSeries& series;
                TChart& chart;
                TChartEditor& chartEditor;
                unsigned __int32 start_time;
};

because this dose't work? Or is it even possible?
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Question by:mikrodidakt
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LVL 30

Accepted Solution

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Axter earned 375 total points
ID: 17071129
Hi mikrodidakt,
You can not.
It's not allowed by the C++ standards.

Cheers!
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