contrib: Added Boost.Foreach helpers

git-svn-id: http://pugixml.googlecode.com/svn/trunk@243 99668b35-9821-0410-8761-19e4c4f06640

contrib/foreach.hpp

+/*
+ * Boost.Foreach support for pugixml classes.
+ * This file is provided to the public domain.
+ * Written by Arseny Kapoulkine (arseny.kapoulkine@gmail.com)
+ */
+
+#ifndef HEADER_PUGIXML_FOREACH_HPP
+#define HEADER_PUGIXML_FOREACH_HPP
+
+#include "pugixml.hpp"
+
+/*
+ * These types add support for BOOST_FOREACH macro to xml_node and xml_document classes (child iteration only).
+ * Example usage:
+ * BOOST_FOREACH(xml_node n, doc) {}
+ */
+
+namespace boost
+{
+	template <typename> struct range_mutable_iterator;
+	template <typename> struct range_const_iterator;
+
+	template<> struct range_mutable_iterator<pugi::xml_node>
+	{
+		typedef pugi::xml_node::iterator type;
+	};
+
+	template<> struct range_const_iterator<pugi::xml_node>
+	{
+		typedef pugi::xml_node::iterator type;
+	};
+
+	template<> struct range_mutable_iterator<pugi::xml_document>
+	{
+		typedef pugi::xml_document::iterator type;
+	};
+
+	template<> struct range_const_iterator<pugi::xml_document>
+	{
+		typedef pugi::xml_document::iterator type;
+	};
+}
+
+/*
+ * These types add support for BOOST_FOREACH macro to xml_node and xml_document classes (child/attribute iteration).
+ * Example usage:
+ * BOOST_FOREACH(xml_node n, children(doc)) {}
+ * BOOST_FOREACH(xml_node n, attributes(doc)) {}
+ */
+
+namespace pugi
+{
+	struct xml_node_children_adapter
+	{
+		typedef pugi::xml_node::iterator iterator;
+		typedef pugi::xml_node::iterator const_iterator;
+
+		xml_node node;
+
+		const_iterator begin() const
+		{
+			return node.begin();
+		}
+
+		const_iterator end() const
+		{
+			return node.end();
+		}
+	};
+
+	xml_node_children_adapter children(const pugi::xml_node& node)
+	{
+		xml_node_children_adapter result = {node};
+		return result;
+	}
+
+	struct xml_node_attribute_adapter
+	{
+		typedef pugi::xml_node::attribute_iterator iterator;
+		typedef pugi::xml_node::attribute_iterator const_iterator;
+
+		xml_node node;
+
+		const_iterator begin() const
+		{
+			return node.attributes_begin();
+		}
+
+		const_iterator end() const
+		{
+			return node.attributes_end();
+		}
+	};
+
+	xml_node_attribute_adapter attributes(const pugi::xml_node& node)
+	{
+		xml_node_attribute_adapter result = {node};
+		return result;
+	}
+}
+
+#endif