very simpled and limited stack class (fixed size even)

svn-id: r13429

common/stack.h

@@ -0,0 +1,68 @@
+/* ScummVM - Scumm Interpreter
+ * Copyright (C) 2002-2004 The ScummVM project
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ *
+ * $Header$
+ */
+
+#ifndef COMMON_STACK_H
+#define COMMON_STACK_H
+
+#include "common/scummsys.h"
+#include <assert.h>
+
+namespace Common {
+
+/**
+ * Extremly simple fixed size stack class.
+ */
+template <class T, int MAX_SIZE = 10>
+class Stack {
+protected:
+	T	_stack[MAX_SIZE];
+	int	_size;
+public:
+	Stack<T, MAX_SIZE>() : _size(0) {}
+	
+	bool empty() const {
+		return _size <= 0;
+	}
+	void push(T x) {
+		assert(_size < MAX_SIZE);
+		_stack[_size++] = x;
+	}
+	T top() const {
+		if (_size > 0)
+			return _stack[_size - 1];
+		else
+			return 0;
+	}
+	void pop() {
+		assert(_size > 0);
+		_stack[--_size] = 0;
+	}
+	int size() const {
+		return _size;
+	}
+	T operator [](int i) {
+		assert(0 <= i && i < MAX_SIZE);
+		return _stack[i];
+	}
+};
+
+} // End of namespace Common
+
+#endif