Add commit 43aab01 of BenHanson/lexertl14 from github

YACReaderLibrary/lexertl/parser/tree/end_node.hpp

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+// end_node.hpp
+// Copyright (c) 2005-2018 Ben Hanson (http://www.benhanson.net/)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file licence_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+#ifndef LEXERTL_END_NODE_HPP
+#define LEXERTL_END_NODE_HPP
+
+#include "node.hpp"
+
+namespace lexertl
+{
+namespace detail
+{
+template<typename id_type>
+class basic_end_node : public basic_node<id_type>
+{
+public:
+    using node = basic_node<id_type>;
+    using bool_stack = typename node::bool_stack;
+    using const_node_stack = typename node::const_node_stack;
+    using node_ptr_vector = typename node::node_ptr_vector;
+    using node_stack = typename node::node_stack;
+    using node_type = typename node::node_type;
+    using node_vector = typename node::node_vector;
+
+    basic_end_node(const id_type id_, const id_type user_id_,
+        const id_type next_dfa_, const id_type push_dfa_,
+        const bool pop_dfa_) :
+        node(false),
+        _id(id_),
+        _user_id(user_id_),
+        _next_dfa(next_dfa_),
+        _push_dfa(push_dfa_),
+        _pop_dfa(pop_dfa_),
+        _followpos()
+    {
+        node::_firstpos.push_back(this);
+        node::_lastpos.push_back(this);
+    }
+
+    virtual ~basic_end_node() override
+    {
+    }
+
+    virtual node_type what_type() const override
+    {
+        return node::END;
+    }
+
+    virtual bool traverse(const_node_stack &/*node_stack_*/,
+        bool_stack &/*perform_op_stack_*/) const override
+    {
+        return false;
+    }
+
+    virtual const node_vector &followpos() const override
+    {
+        // _followpos is always empty..!
+        return _followpos;
+    }
+
+    virtual bool end_state() const override
+    {
+        return true;
+    }
+
+    virtual id_type id() const override
+    {
+        return _id;
+    }
+
+    virtual id_type user_id() const override
+    {
+        return _user_id;
+    }
+
+    virtual id_type next_dfa() const override
+    {
+        return _next_dfa;
+    }
+
+    virtual id_type push_dfa() const override
+    {
+        return _push_dfa;
+    }
+
+    virtual bool pop_dfa() const override
+    {
+        return _pop_dfa;
+    }
+
+private:
+    id_type _id;
+    id_type _user_id;
+    id_type _next_dfa;
+    id_type _push_dfa;
+    bool _pop_dfa;
+    node_vector _followpos;
+
+    virtual void copy_node(node_ptr_vector &/*node_ptr_vector_*/,
+        node_stack &/*new_node_stack_*/, bool_stack &/*perform_op_stack_*/,
+        bool &/*down_*/) const override
+    {
+        // Nothing to do, as end_nodes are not copied.
+    }
+};
+}
+}
+
+#endif