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diff --git a/src/systemc/ext/channel/sc_fifo_out_if.hh b/src/systemc/ext/channel/sc_fifo_out_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_FIFO_OUT_IF_HH__
+#define __SYSTEMC_EXT_CHANNEL_SC_FIFO_OUT_IF_HH__
+
+#include "../core/sc_interface.hh"
+
+namespace sc_core
+{
+
+class sc_event;
+
+template <class T>
+class sc_fifo_nonblocking_out_if : virtual public sc_interface
+{
+  public:
+    virtual bool ab_write(const T &) = 0;
+    virtual const sc_event &data_read_event() const = 0;
+};
+
+template <class T>
+class sc_fifo_blocking_out_if : virtual public sc_interface
+{
+  public:
+    virtual void write(const T &) = 0;
+};
+
+template <class T>
+class sc_fifo_out_if : public sc_fifo_nonblocking_out_if<T>,
+                       public sc_fifo_blocking_out_if<T>
+{
+  public:
+    virtual int num_free() const = 0;
+
+  protected:
+    sc_fifo_out_if() : sc_interface(), sc_fifo_nonblocking_out_if<T>(),
+            sc_fifo_blocking_out_if<T>()
+    {}
+
+  private:
+    sc_fifo_out_if(const sc_fifo_out_if<T> &) : sc_interface(),
+            sc_fifo_nonblocking_out_if<T>(), sc_fifo_blocking_out_if<T>()
+    {}
+    sc_fifo_out_if<T> &operator = (const sc_fifo_out_if<T> &) { return *this; }
+};
+
+} // namespace sc_core
+
+#endif  //__SYSTEMC_EXT_CHANNEL_SC_FIFO_OUT_IF_HH__