f - Add example to NetworkUpdateHandler docs

Author: jkczyz

lightning/src/routing/network_graph.rs

@@ -112,6 +112,34 @@ impl_writeable_tlv_based_enum_upgradable!(NetworkUpdate,
 
 /// An [`EventHandler`] decorator for applying updates from [`Event::PaymentFailed`] to the
 /// [`NetworkGraph`].
+///
+/// # Example
+///
+/// ```
+/// # extern crate bitcoin;
+/// #
+/// # use bitcoin::blockdata::constants::genesis_block;
+/// # use bitcoin::network::constants::Network;
+/// # use lightning::routing::network_graph::{NetworkGraph, NetworkUpdateHandler};
+/// # use lightning::util::events::Event;
+/// # use lightning::util::logger::{Logger, Record};
+/// #
+///	# struct NullLogger;
+///	# impl Logger for NullLogger {
+///	#     fn log(&self, _record: &Record) {}
+///	# }
+/// let network_graph = NetworkGraph::new(genesis_block(Network::Testnet).header.block_hash());
+/// let logger = NullLogger {};
+/// let event_handler = |event: &Event| {
+///     // Handle event
+/// };
+/// let event_handler = NetworkUpdateHandler::new(&network_graph, &logger, event_handler);
+/// ```
+///
+/// Once `event_handler` has been decorated, use it with any implementation of [`EventsProvider`] as
+/// usual.
+///
+/// [`EventsProvider`]: crate::util::events::EventsProvider
 pub struct NetworkUpdateHandler<G: Deref<Target=NetworkGraph>, L: Deref, E: EventHandler>
 where L::Target: Logger {
 	secp_ctx: Secp256k1<secp256k1::VerifyOnly>,