Add generic serialization implementations for Boxs and 3-tuples

These are used in the next commit(s).

Author: TheBlueMatt

lightning/src/util/ser.rs

@@ -698,6 +698,18 @@ impl Readable for PaymentSecret {
 	}
 }
 
+impl<T: Writeable> Writeable for Box<T> {
+	fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
+		T::write(&**self, w)
+	}
+}
+
+impl<T: Readable> Readable for Box<T> {
+	fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
+		Ok(Box::new(Readable::read(r)?))
+	}
+}
+
 impl<T: Writeable> Writeable for Option<T> {
 	fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
 		match *self {
@@ -824,3 +836,19 @@ impl<A: Writeable, B: Writeable> Writeable for (A, B) {
 		self.1.write(w)
 	}
 }
+
+impl<A: Readable, B: Readable, C: Readable> Readable for (A, B, C) {
+	fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
+		let a: A = Readable::read(r)?;
+		let b: B = Readable::read(r)?;
+		let c: C = Readable::read(r)?;
+		Ok((a, b, c))
+	}
+}
+impl<A: Writeable, B: Writeable, C: Writeable> Writeable for (A, B, C) {
+	fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
+		self.0.write(w)?;
+		self.1.write(w)?;
+		self.2.write(w)
+	}
+}

lightning/src/util/ser_macros.rs

@@ -523,7 +523,7 @@ macro_rules! impl_writeable_tlv_based_enum {
 #[cfg(test)]
 mod tests {
 	use prelude::*;
-	use std::io::{Cursor, Read};
+	use std::io::Cursor;
 	use ln::msgs::DecodeError;
 	use util::ser::{Readable, Writeable, HighZeroBytesDroppedVarInt, VecWriter};
 	use bitcoin::secp256k1::PublicKey;
@@ -593,13 +593,6 @@ mod tests {
 			(0xdeadbeef1badbeef, 0x1bad1dea, Some(0x01020304)));
 	}
 
-	impl Readable for (PublicKey, u64, u64) {
-		#[inline]
-		fn read<R: Read>(reader: &mut R) -> Result<(PublicKey, u64, u64), DecodeError> {
-			Ok((Readable::read(reader)?, Readable::read(reader)?, Readable::read(reader)?))
-		}
-	}
-
 	// BOLT TLV test cases
 	fn tlv_reader_n1(s: &[u8]) -> Result<(Option<HighZeroBytesDroppedVarInt<u64>>, Option<u64>, Option<(PublicKey, u64, u64)>, Option<u16>), DecodeError> {
 		let mut s = Cursor::new(s);