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Minimal test - lines (15, 86)

Code

namespace mozilla {
namespace widget {

/* this is handy wrapper around JSAPI to make it more pleasant to use.
 * We collect the JSAPI errors and so that callers don't need to */
class MOZ_STACK_CLASS InfoObject {
  friend class GfxInfoBase;

 public:
  void DefineProperty(const char* name, int value);
  void DefineProperty(const char* name, nsAString& value);
  void DefineProperty(const char* name, const char* value);

 private:
  // We need to ensure that this object lives on the stack so that GC sees it
  // properly
  explicit InfoObject(JSContext* aCx);
  InfoObject(InfoObject&);

  JSContext* mCx;
  JS::Rooted mObj;
  bool mOk;
};

/*

   Here's an example usage:

   class Foo {
   Foo::Foo() : mInfoCollector(this, &Foo::GetAweseomeness) {}

   void GetAwesomeness(InfoObject &obj) {
     obj.DefineProperty("awesome", mAwesome);
   }

   int mAwesome;

   GfxInfoCollector mInfoCollector;
   }

   This will define a property on the object
   returned from calling getInfo() on a
   GfxInfo object. e.g.

       gfxInfo = Cc["@mozilla.org/gfx/info;1"].getService(Ci.nsIGfxInfo);
       info = gfxInfo.getInfo();
       if (info.awesome)
          alert(info.awesome);

*/

class GfxInfoCollectorBase {
 public:
  GfxInfoCollectorBase();
  virtual void GetInfo(InfoObject& obj) = 0;
  virtual ~GfxInfoCollectorBase();
};

template 
class GfxInfoCollector : public GfxInfoCollectorBase {
 public:
  GfxInfoCollector(T* aPointer, void (T::*aFunc)(InfoObject& obj))
      : mPointer(aPointer), mFunc(aFunc) {}
  virtual void GetInfo(InfoObject& obj) override { (mPointer->*mFunc)(obj); }

 protected:
  T* mPointer;
  void (T::*mFunc)(InfoObject& obj);
};

}  // namespace widget
}  // namespace mozilla