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diff --git a/src/systemc/ext/channel/sc_signal_in_if.hh b/src/systemc/ext/channel/sc_signal_in_if.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_CHANNEL_SC_SIGNAL_IN_IF_HH__
+#define __SYSTEMC_EXT_CHANNEL_SC_SIGNAL_IN_IF_HH__
+
+#include "../core/sc_interface.hh"
+
+namespace sc_dt
+{
+
+class sc_logic;
+
+};
+
+namespace sc_core
+{
+
+class sc_event;
+
+template <class T>
+class sc_signal_in_if : virtual public sc_interface
+{
+  public:
+    virtual const T &read() const = 0;
+    virtual const sc_event &value_changed_event() const = 0;
+    virtual bool event() const = 0;
+
+  protected:
+    sc_signal_in_if() : sc_interface() {}
+
+  private:
+    // Disabled
+    sc_signal_in_if(const sc_signal_in_if<T> &) : sc_interface() {}
+    sc_signal_in_if<T> &
+    operator = (const sc_signal_in_if<T> &)
+    {
+        return *this;
+    }
+};
+
+template <>
+class sc_signal_in_if<bool> : virtual public sc_interface
+{
+  public:
+    virtual const bool &read() const = 0;
+
+    virtual const sc_event &value_changed_event() const = 0;
+    virtual const sc_event &posedge_event() const = 0;
+    virtual const sc_event &negedge_event() const = 0;
+
+    virtual bool event() const = 0;
+    virtual bool posedge() const = 0;
+    virtual bool negedge() const = 0;
+
+  protected:
+    sc_signal_in_if() : sc_interface() {}
+
+  private:
+    // Disabled
+    sc_signal_in_if(const sc_signal_in_if<bool> &) : sc_interface() {}
+    sc_signal_in_if<bool> &
+    operator = (const sc_signal_in_if<bool> &)
+    {
+        return *this;
+    }
+};
+
+template <>
+class sc_signal_in_if<sc_dt::sc_logic> : virtual public sc_interface
+{
+  public:
+    virtual const sc_dt::sc_logic &read() const = 0;
+
+    virtual const sc_event &value_changed_event() const = 0;
+    virtual const sc_event &posedge_event() const = 0;
+    virtual const sc_event &negedge_event() const = 0;
+
+    virtual bool event() const = 0;
+    virtual bool posedge() const = 0;
+    virtual bool negedge() const = 0;
+
+  protected:
+    sc_signal_in_if() : sc_interface() {}
+
+  private:
+    // Disabled
+    sc_signal_in_if(const sc_signal_in_if<sc_dt::sc_logic> &) :
+            sc_interface()
+    {}
+    sc_signal_in_if<sc_dt::sc_logic> &
+    operator = (const sc_signal_in_if<sc_dt::sc_logic> &)
+    {
+        return *this;
+    }
+};
+
+} // namespace sc_core
+
+#endif  //__SYSTEMC_EXT_CHANNEL_SC_SIGNAL_IN_IF_HH__