bindings: Add Channel::get_index() method.

bindings/cxx/classes.cpp

@@ -482,6 +482,11 @@ void Channel::set_enabled(bool value)
 	check(sr_dev_channel_enable(parent->structure, structure->index, value));
 }
 
+unsigned int Channel::get_index()
+{
+	return structure->index;
+}
+
 ChannelGroup::ChannelGroup(Device *device,
 		struct sr_channel_group *structure) :
 	StructureWrapper<Device, struct sr_channel_group>(structure),

bindings/cxx/include/libsigrok/libsigrok.hpp

@@ -340,6 +340,8 @@ public:
 	bool get_enabled();
 	/** Set the enabled status of this channel. */
 	void set_enabled(bool value);
+	/** Get the index number of this channel. */
+	unsigned int get_index();
 protected:
 	Channel(struct sr_channel *structure);
 	~Channel();

bindings/swig/classes.i

@@ -200,6 +200,7 @@ typedef std::map<const sigrok::ConfigKey *, Glib::VariantBase>
 %attributestring(sigrok::Channel, std::string, name, get_name, set_name);
 %attribute(sigrok::Channel, bool, enabled, get_enabled, set_enabled);
 %attribute(sigrok::Channel, const sigrok::ChannelType *, type, get_type);
+%attribute(sigrok::Channel, unsigned int, index, get_index);
 
 %attributestring(sigrok::ChannelGroup, std::string, name, get_name);
 %attributeval(sigrok::ChannelGroup,