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diff --git a/src/systemc/ext/core/sc_event.hh b/src/systemc/ext/core/sc_event.hh
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+++ b/src/systemc/ext/core/sc_event.hh
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+/*
+ * Copyright 2018 Google, Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution;
+ * neither the name of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Authors: Gabe Black
+ */
+
+#ifndef __SYSTEMC_EXT_CORE_SC_EVENT_HH__
+#define __SYSTEMC_EXT_CORE_SC_EVENT_HH__
+
+#include <vector>
+
+#include "sc_time.hh"
+
+namespace sc_core
+{
+
+class sc_event;
+class sc_event_and_expr;
+class sc_event_or_expr;
+class sc_object;
+class sc_port_base;
+
+class sc_event_finder
+{
+  protected:
+    void warn_unimpl(const char *func) const;
+};
+
+template <class IF>
+class sc_event_finder_t : public sc_event_finder
+{
+  public:
+    sc_event_finder_t(const sc_port_base &,
+                      const sc_event & (IF::*event_method)() const)
+    {
+        warn_unimpl(__PRETTY_FUNCTION__);
+    }
+};
+
+class sc_event_and_list
+{
+  public:
+    sc_event_and_list();
+    sc_event_and_list(const sc_event_and_list &);
+    sc_event_and_list(const sc_event &);
+    sc_event_and_list &operator = (const sc_event_and_list &);
+
+    int size() const;
+    void swap(sc_event_and_list &);
+
+    sc_event_and_list &operator &= (const sc_event &);
+    sc_event_and_list &operator &= (const sc_event_and_list &);
+
+    sc_event_and_expr operator & (const sc_event &) const;
+    sc_event_and_expr operator & (const sc_event_and_list &);
+};
+
+class sc_event_or_list
+{
+  public:
+    sc_event_or_list();
+    sc_event_or_list(const sc_event_or_list &);
+    sc_event_or_list(const sc_event &);
+    sc_event_or_list& operator = (const sc_event_or_list &);
+    ~sc_event_or_list();
+
+    int size() const;
+    void swap(sc_event_or_list &);
+
+    sc_event_or_list &operator |= (const sc_event &);
+    sc_event_or_list &operator |= (const sc_event_or_list &);
+
+    sc_event_or_expr operator | (const sc_event &) const;
+    sc_event_or_expr operator | (const sc_event_or_list &) const;
+};
+
+class sc_event_and_expr
+{
+  public:
+    operator const sc_event_and_list &() const;
+};
+
+sc_event_and_expr operator & (sc_event_and_expr, sc_event const &);
+sc_event_and_expr operator & (sc_event_and_expr, sc_event_and_list const &);
+
+class sc_event_or_expr
+{
+  public:
+    operator const sc_event_or_list &() const;
+};
+
+sc_event_or_expr operator | (sc_event_or_expr, sc_event const &);
+sc_event_or_expr operator | (sc_event_or_expr, sc_event_or_list const &);
+
+class sc_event
+{
+  public:
+    sc_event();
+    explicit sc_event(const char *);
+    ~sc_event();
+
+    const char *name() const;
+    const char *basename() const;
+    bool in_hierarchy() const;
+    sc_object *get_parent_object() const;
+
+    void notify();
+    void notify(const sc_time &);
+    void notify(double, sc_time_unit);
+    void cancel();
+
+    sc_event_and_expr operator & (const sc_event &) const;
+    sc_event_and_expr operator & (const sc_event_and_list &) const;
+    sc_event_or_expr operator | (const sc_event &) const;
+    sc_event_or_expr operator | (const sc_event_or_list &) const;
+
+  private:
+    // Disabled
+    sc_event(const sc_event &) {}
+    sc_event &operator = (const sc_event &) { return *this; }
+};
+
+const std::vector<sc_event *> &sc_get_top_level_events();
+sc_event *sc_find_event(const char *);
+
+} // namespace sc_core
+
+#endif  //__SYSTEMC_EXT_CORE_SC_INTERFACE_HH__