Fix typo in grammar.

Add lexertl.

inc/lexertl/containers/ptr_stack.hpp

@@ -0,0 +1,69 @@
+// ptr_stack.hpp
+// Copyright (c) 2005-2012 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_PTR_STACK_HPP
+#define LEXERTL_PTR_STACK_HPP
+
+#include <stack>
+
+namespace lexertl
+{
+namespace detail
+{
+template<typename ptr_type>
+class ptr_stack
+{
+public:
+    typedef std::stack<ptr_type *> stack;
+
+    ptr_stack () :
+        _stack ()
+    {
+    }
+
+    ~ptr_stack ()
+    {
+        clear ();
+    }
+
+    stack *operator -> ()
+    {
+        return &_stack;
+    }
+
+    const stack *operator -> () const
+    {
+        return &_stack;
+    }
+
+    stack &operator * ()
+    {
+        return _stack;
+    }
+
+    const stack &operator * () const
+    {
+        return _stack;
+    }
+
+    void clear ()
+    {
+        while (!_stack.empty ())
+        {
+            delete _stack.top ();
+            _stack.pop ();
+        }
+    }
+
+private:
+    stack _stack;
+
+    ptr_stack (const ptr_stack &); // No copy construction.
+    ptr_stack &operator = (const ptr_stack &); // No assignment.
+};
+}
+}
+
+#endif