[cairo] forward declaration

[陈凯]

Hi, everyone.  I've got a problem on forward declaration.  In my
drawinghelper.h, i wrote my code like this but compilation fails.  g++
complains "Cairo not declared".

////////////////////////////  DrawingHelp.h
///////////////////////////////////
class Context;

template <typename T>
class RefPtr;

class DrawingHelper
{
public:
    void Draw(Cairo::RefPtr<Cairo::Context>& context);  // g++ complains
"Cairo not declared".

// bla bla bla
};

//////////////////////////////////////////////////////////////////////////////////////

Is there anything wrong with that? Please help me to correct my error,
thanks :)

Best regards
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