f - use macro instead of type alias

lightning/src/ln/channelmanager.rs

@@ -76,11 +76,16 @@ use crate::util::logger::{Level, Logger, WithContext};
 use crate::util::errors::APIError;
 #[cfg(not(c_bindings))]
 use {
+	crate::offers::offer::{DerivedMetadata, OfferBuilder},
 	crate::routing::router::DefaultRouter,
 	crate::routing::gossip::NetworkGraph,
 	crate::routing::scoring::{ProbabilisticScorer, ProbabilisticScoringFeeParameters},
 	crate::sign::KeysManager,
 };
+#[cfg(c_bindings)]
+use {
+	crate::offers::offer::OfferWithDerivedMetadataBuilder,
+};
 
 use alloc::collections::{btree_map, BTreeMap};
 
@@ -98,12 +103,6 @@ use core::ops::Deref;
 pub use crate::ln::outbound_payment::{PaymentSendFailure, ProbeSendFailure, Retry, RetryableSendFailure, RecipientOnionFields};
 use crate::ln::script::ShutdownScript;
 
-#[cfg(not(c_bindings))]
-type OfferBuilder<'a> =
-	crate::offers::offer::OfferBuilder<'a, crate::offers::offer::DerivedMetadata, secp256k1::All>;
-#[cfg(c_bindings)]
-type OfferBuilder<'a> = crate::offers::offer::OfferWithDerivedMetadataBuilder<'a>;
-
 // We hold various information about HTLC relay in the HTLC objects in Channel itself:
 //
 // Upon receipt of an HTLC from a peer, we'll give it a PendingHTLCStatus indicating if it should
@@ -7526,7 +7525,9 @@ where
 			self.finish_close_channel(failure);
 		}
 	}
+}
 
+macro_rules! create_offer_builder { ($self: ident, $builder: ty) => {
 	/// Creates an [`OfferBuilder`] such that the [`Offer`] it builds is recognized by the
 	/// [`ChannelManager`] when handling [`InvoiceRequest`] messages for the offer. The offer will
 	/// not have an expiration unless otherwise set on the builder.
@@ -7555,34 +7556,52 @@ where
 	/// [`Offer`]: crate::offers::offer::Offer
 	/// [`InvoiceRequest`]: crate::offers::invoice_request::InvoiceRequest
 	pub fn create_offer_builder(
-		&self, description: String
-	) -> Result<OfferBuilder, Bolt12SemanticError> {
-		let node_id = self.get_our_node_id();
-		let expanded_key = &self.inbound_payment_key;
-		let entropy = &*self.entropy_source;
+		&$self, description: String
+	) -> Result<$builder, Bolt12SemanticError> {
+		let node_id = $self.get_our_node_id();
+		let expanded_key = &$self.inbound_payment_key;
+		let entropy = &*$self.entropy_source;
 
-		let path = self.create_blinded_path().map_err(|_| Bolt12SemanticError::MissingPaths)?;
+		let path = $self.create_blinded_path().map_err(|_| Bolt12SemanticError::MissingPaths)?;
 
 		#[cfg(not(c_bindings))] {
-			let builder = OfferBuilder::deriving_signing_pubkey(
-				description, node_id, expanded_key, entropy, &self.secp_ctx
+			let builder = <$builder>::deriving_signing_pubkey(
+				description, node_id, expanded_key, entropy, &$self.secp_ctx
 			)
-				.chain_hash(self.chain_hash)
+				.chain_hash($self.chain_hash)
 				.path(path);
 
 			Ok(builder)
 		}
 
 		#[cfg(c_bindings)] {
-			let mut builder = OfferBuilder::deriving_signing_pubkey(
-				description, node_id, expanded_key, entropy, &self.secp_ctx
+			let mut builder = <$builder>::deriving_signing_pubkey(
+				description, node_id, expanded_key, entropy, &$self.secp_ctx
 			);
-			builder.chain_hash(self.chain_hash);
+			builder.chain_hash($self.chain_hash);
 			builder.path(path);
 
 			Ok(builder)
 		}
 	}
+} }
+
+impl<M: Deref, T: Deref, ES: Deref, NS: Deref, SP: Deref, F: Deref, R: Deref, L: Deref> ChannelManager<M, T, ES, NS, SP, F, R, L>
+where
+	M::Target: chain::Watch<<SP::Target as SignerProvider>::EcdsaSigner>,
+	T::Target: BroadcasterInterface,
+	ES::Target: EntropySource,
+	NS::Target: NodeSigner,
+	SP::Target: SignerProvider,
+	F::Target: FeeEstimator,
+	R::Target: Router,
+	L::Target: Logger,
+{
+	#[cfg(not(c_bindings))]
+	create_offer_builder!(self, OfferBuilder<DerivedMetadata, secp256k1::All>);
+
+	#[cfg(c_bindings)]
+	create_offer_builder!(self, OfferWithDerivedMetadataBuilder);
 
 	/// Creates a [`RefundBuilder`] such that the [`Refund`] it builds is recognized by the
 	/// [`ChannelManager`] when handling [`Bolt12Invoice`] messages for the refund.