2 files changed, 13 insertions, 1 deletions
diff --git a/include/cru/base/Base.h b/include/cru/base/Base.h
index fda45f66..3cd04f8c 100644
--- a/include/cru/base/Base.h
+++ b/include/cru/base/Base.h
@@ -137,12 +137,17 @@ class CRU_BASE_API Exception : public std::exception {
   std::shared_ptr<std::exception> inner_;
 };
 
+class CRU_BASE_API NotImplementedException : public Exception {
+ public:
+  using Exception::Exception;  // inherit constructors
+};
+
 class CRU_BASE_API PlatformException : public Exception {
  public:
   using Exception::Exception;  // inherit constructors
 };
 
-class ErrnoException : public Exception {
+class CRU_BASE_API ErrnoException : public Exception {
  public:
   ErrnoException();
   explicit ErrnoException(int error_code);
diff --git a/include/cru/base/Event.h b/include/cru/base/Event.h
index bdaf3ea6..71c0ac6b 100644
--- a/include/cru/base/Event.h
+++ b/include/cru/base/Event.h
@@ -141,6 +141,13 @@ class Event : public EventBase, public IEvent<TEventArgs> {
  public:                                 \
   ::cru::IEvent<arg_type>* name##Event() { return &name##Event_; }
 
+#define CRU_DEFINE_EVENT_OVERRIDE(name, arg_type) \
+ private:                                         \
+  ::cru::Event<arg_type> name##Event_;            \
+                                                  \
+ public:                                          \
+  ::cru::IEvent<arg_type>* name##Event() override { return &name##Event_; }
+
 namespace details {
 struct EventHandlerRevokerCaller {
   void operator()(const EventHandlerRevoker& revoker) { revoker(); }