COMMON: New foreach macro to loop through lists.

common/foreach.h

@@ -0,0 +1,69 @@
+/* Residual - A 3D game interpreter
+ *
+ * Residual is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ *
+ * $URL$
+ * $Id$
+ */
+
+#ifndef COMMON_FOREACH_H
+#define COMMON_FOREACH_H
+
+namespace Common {
+
+class _Foreach_Container_Base_ {
+public:
+	_Foreach_Container_Base_() : brk(1) { }
+	mutable uint brk;
+};
+
+template<class T>
+class _Foreach_Container_ : public _Foreach_Container_Base_ {
+public:
+	_Foreach_Container_(const T &co) : i(co.begin()), e(co.end()) { }
+	void next() const {
+		++i;
+		brk = 1;
+	}
+	bool end() const { return i == e; }
+
+	mutable typename T::const_iterator i;
+	typename T::const_iterator e;
+};
+
+template<class T>
+inline _Foreach_Container_<T> _Create_Foreach_Container_(const T &c) {
+	return _Foreach_Container_<T>(c);
+}
+
+template<class T>
+inline const _Foreach_Container_<T> *_Get_Foreach_Container_(const _Foreach_Container_Base_ *c, const T &) {
+	return static_cast<const _Foreach_Container_<T> *>(c);
+}
+
+}
+
+#define foreach(var, container) \
+for (const Common::_Foreach_Container_Base_ &_FOREACH_CONTAINER_ = Common::_Create_Foreach_Container_(container);\
+	!Common::_Get_Foreach_Container_(&_FOREACH_CONTAINER_, container)->end(); \
+	Common::_Get_Foreach_Container_(&_FOREACH_CONTAINER_, container)->next()) \
+	for (var = *Common::_Get_Foreach_Container_(&_FOREACH_CONTAINER_, container)->i;\
+		_FOREACH_CONTAINER_.brk > 0; --_FOREACH_CONTAINER_.brk)
+
+#endif