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26 #ifndef FeatureObserver_h
27 #define FeatureObserver_h
29 #include <wtf/Noncopyable.h>
35 class FeatureObserver {
36 WTF_MAKE_NONCOPYABLE(FeatureObserver);
46 // Add new features above this line.
47 NumberOfFeatures, // This enum value must be last.
50 static void observe(DOMWindow*, Feature);
53 void didObserve(Feature feature)
55 COMPILE_ASSERT(sizeof(m_featureMask) * 8 >= NumberOfFeatures, FeaturesMustNotOverflowBitmask);
56 ASSERT(feature != PageDestruction); // PageDestruction is reserved as a scaling factor.
57 ASSERT(feature < NumberOfFeatures);
58 m_featureMask |= 1 << static_cast<int>(feature);
64 } // namespace WebCore
66 #endif // FeatureObserver_h