hello world

neo/idlib/containers/Queue.h

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+/*
+===========================================================================
+
+Doom 3 GPL Source Code
+Copyright (C) 1999-2011 id Software LLC, a ZeniMax Media company. 
+
+This file is part of the Doom 3 GPL Source Code (?Doom 3 Source Code?).  
+
+Doom 3 Source Code 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 3 of the License, or
+(at your option) any later version.
+
+Doom 3 Source Code 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 Doom 3 Source Code.  If not, see <http://www.gnu.org/licenses/>.
+
+In addition, the Doom 3 Source Code is also subject to certain additional terms. You should have received a copy of these additional terms immediately following the terms and conditions of the GNU General Public License which accompanied the Doom 3 Source Code.  If not, please request a copy in writing from id Software at the address below.
+
+If you have questions concerning this license or the applicable additional terms, you may contact in writing id Software LLC, c/o ZeniMax Media Inc., Suite 120, Rockville, Maryland 20850 USA.
+
+===========================================================================
+*/
+
+#ifndef __QUEUE_H__
+#define __QUEUE_H__
+
+/*
+===============================================================================
+
+	Queue template
+
+===============================================================================
+*/
+
+#define idQueue( type, next )		idQueueTemplate<type, (int)&(((type*)NULL)->next)>
+
+template< class type, int nextOffset >
+class idQueueTemplate {
+public:
+							idQueueTemplate( void );
+
+	void					Add( type *element );
+	type *					Get( void );
+
+private:
+	type *					first;
+	type *					last;
+};
+
+#define QUEUE_NEXT_PTR( element )		(*((type**)(((byte*)element)+nextOffset)))
+
+template< class type, int nextOffset >
+idQueueTemplate<type,nextOffset>::idQueueTemplate( void ) {
+	first = last = NULL;
+}
+
+template< class type, int nextOffset >
+void idQueueTemplate<type,nextOffset>::Add( type *element ) {
+	QUEUE_NEXT_PTR(element) = NULL;
+	if ( last ) {
+		QUEUE_NEXT_PTR(last) = element;
+	} else {
+		first = element;
+	}
+	last = element;
+}
+
+template< class type, int nextOffset >
+type *idQueueTemplate<type,nextOffset>::Get( void ) {
+	type *element;
+
+	element = first;
+	if ( element ) {
+		first = QUEUE_NEXT_PTR(first);
+		if ( last == element ) {
+			last = NULL;
+		}
+		QUEUE_NEXT_PTR(element) = NULL;
+	}
+	return element;
+}
+
+#endif /* !__QUEUE_H__ */