Expose impl_writeable_msg

lightning/src/util/ser_macros.rs

@@ -457,6 +457,35 @@ macro_rules! _decode_tlv_stream_range {
 	} }
 }
 
+/// Implements [`Readable`]/[`Writeable`] for a message struct that may include non-TLV and
+/// TLV-encoded parts.
+///
+/// This is useful to implement a [`CustomMessageReader`].
+///
+/// If `$fieldty` is `required`, then `$tlvfield` is a required field that is not an [`Option`] nor a [`Vec`].
+/// If `$fieldty` is `(default_value, $default)`, then `$tlvfield` will be set to `$default` if not present.
+/// If `$fieldty` is `option`, then `$tlvfield` is optional field.
+/// If `$fieldty` is `vec_type`, then `$tlvfield` is a [`Vec`], which needs to have its individual elements serialized.
+///
+/// For example,
+/// ```
+/// # use lightning::impl_writeable_msg;
+/// impl_writeable_msg!(MyCustomMessage, {
+/// 	field_1,
+/// 	field_2,
+/// 	field_3,
+/// }{
+/// 	(0, tlv_integer, required),
+/// 	(1, tlv_default_integer, (default_value, 7)),
+/// 	(2, tlv_optional_integer, option),
+/// 	(3, tlv_vec_type_integer, vec_type),
+/// });
+/// ```
+///
+/// [`Readable`]: crate::util::ser::Readable
+/// [`Writeable`]: crate::util::ser::Writeable
+/// [`CustomMessageReader`]: crate::ln::wire::CustomMessageReader
+#[macro_export]
 macro_rules! impl_writeable_msg {
 	($st:ident, {$($field:ident),* $(,)*}, {$(($type: expr, $tlvfield: ident, $fieldty: tt)),* $(,)*}) => {
 		impl $crate::util::ser::Writeable for $st {
@@ -642,10 +671,10 @@ macro_rules! _init_and_read_tlv_fields {
 }
 
 /// Implements [`Readable`]/[`Writeable`] for a struct storing it as a set of TLVs
-/// If `$fieldty` is `required`, then `$field` is a required field that is not an Option nor a Vec.
+/// If `$fieldty` is `required`, then `$field` is a required field that is not an [`Option`] nor a [`Vec`].
 /// If `$fieldty` is `(default_value, $default)`, then `$field` will be set to `$default` if not present.
 /// If `$fieldty` is `option`, then `$field` is optional field.
-/// If `$fieldty` is `vec_type`, then `$field` is a Vec, which needs to have its individual elements serialized.
+/// If `$fieldty` is `vec_type`, then `$field` is a [`Vec`], which needs to have its individual elements serialized.
 ///
 /// For example,
 /// ```