--- /dev/null
+/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
+ * Use of this file is governed by the BSD 3-clause license that
+ * can be found in the LICENSE.txt file in the project root.
+ */
+
+#pragma once
+
+#include "antlr4-common.h"
+
+namespace antlr4 {
+namespace atn {
+
+ /// <summary>
+ /// Represents the serialization type of a <seealso cref="LexerAction"/>.
+ ///
+ /// @author Sam Harwell
+ /// @since 4.2
+ /// </summary>
+ enum class LexerActionType : size_t {
+ /// <summary>
+ /// The type of a <seealso cref="LexerChannelAction"/> action.
+ /// </summary>
+ CHANNEL,
+ /// <summary>
+ /// The type of a <seealso cref="LexerCustomAction"/> action.
+ /// </summary>
+ CUSTOM,
+ /// <summary>
+ /// The type of a <seealso cref="LexerModeAction"/> action.
+ /// </summary>
+ MODE,
+ /// <summary>
+ /// The type of a <seealso cref="LexerMoreAction"/> action.
+ /// </summary>
+ MORE,
+ /// <summary>
+ /// The type of a <seealso cref="LexerPopModeAction"/> action.
+ /// </summary>
+ POP_MODE,
+ /// <summary>
+ /// The type of a <seealso cref="LexerPushModeAction"/> action.
+ /// </summary>
+ PUSH_MODE,
+ /// <summary>
+ /// The type of a <seealso cref="LexerSkipAction"/> action.
+ /// </summary>
+ SKIP,
+ /// <summary>
+ /// The type of a <seealso cref="LexerTypeAction"/> action.
+ /// </summary>
+ TYPE,
+ };
+
+} // namespace atn
+} // namespace antlr4