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Linked list of polygons

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How do I create a linked list of polygons using STL? I have a polygon class, CPolygon, but doing
  
CPolygon poly(1,1,1, 0,1,1 ,1,2,3); //poly initialized with some random vertex positions

std::list<CPolygon> polyList;

//followed by 


polyList.push_back(poly);

  
seems to just pass a pointer to the poly to the poly list rather than the poly itself. I know this because if I later change the polygon I passed to the list, then display the contents of the list, the contents will be changed. www.elf-stone.com

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