Added support for Vec<T>, Box<T> and Box<[T]>

src/enc/impls.rs

@@ -103,6 +103,27 @@ impl Encodeable for &'_ [u8] {
     }
 }
 
+// BlockedTODO: https://github.com/rust-lang/rust/issues/37653
+//
+// We'll want to implement encoding for both &[u8] and &[T: Encodeable],
+// but those implementations overlap because u8 also implements Encodeabl
+//
+// default impl Encodeable for &'_ [u8] {
+//     fn encode<E: Encode>(&self, mut encoder: E) -> Result<(), EncodeError> {
+//         encoder.encode_slice(*self)
+//     }
+// }
+//
+// impl<T: Encodeable> Encodeable for &'_ [T] {
+//     fn encode<E: Encode>(&self, mut encoder: E) -> Result<(), EncodeError> {
+//         self.len().encode(&mut encoder)?;
+//         for item in self.iter() {
+//             item.encode(&mut encoder)?;
+//         }
+//         Ok(())
+//     }
+// }
+
 impl Encodeable for &'_ str {
     fn encode<E: Encode>(&self, mut encoder: E) -> Result<(), EncodeError> {
         encoder.encode_slice(self.as_bytes())

src/features/impl_alloc.rs

@@ -1,5 +1,11 @@
-use crate::{config, enc, error, Config};
-use alloc::vec::Vec;
+use crate::{
+    config,
+    de::{Decodable, Decode},
+    enc::{self, Encode, Encodeable},
+    error::{DecodeError, EncodeError},
+    Config,
+};
+use alloc::{boxed::Box, vec::Vec};
 
 #[derive(Default)]
 struct VecWriter {
@@ -7,14 +13,14 @@ struct VecWriter {
 }
 
 impl enc::write::Writer for VecWriter {
-    fn write(&mut self, bytes: &[u8]) -> Result<(), error::EncodeError> {
+    fn write(&mut self, bytes: &[u8]) -> Result<(), EncodeError> {
         self.inner.extend_from_slice(bytes);
         Ok(())
     }
 }
 
 /// Encode the given value into a `Vec<u8>`.
-pub fn encode_to_vec<E: enc::Encodeable>(val: E) -> Result<Vec<u8>, error::EncodeError> {
+pub fn encode_to_vec<E: enc::Encodeable>(val: E) -> Result<Vec<u8>, EncodeError> {
     encode_to_vec_with_config(val, config::Default)
 }
 
@@ -22,9 +28,78 @@ pub fn encode_to_vec<E: enc::Encodeable>(val: E) -> Result<Vec<u8>, error::Encod
 pub fn encode_to_vec_with_config<E: enc::Encodeable, C: Config>(
     val: E,
     config: C,
-) -> Result<Vec<u8>, error::EncodeError> {
+) -> Result<Vec<u8>, EncodeError> {
     let writer = VecWriter::default();
     let mut encoder = enc::Encoder::<_, C>::new(writer, config);
     val.encode(&mut encoder)?;
     Ok(encoder.into_writer().inner)
 }
+
+impl<'de, T> Decodable for Vec<T>
+where
+    T: Decodable,
+{
+    fn decode<D: Decode>(mut decoder: D) -> Result<Self, DecodeError> {
+        let len = usize::decode(&mut decoder)?;
+        let mut vec = Vec::with_capacity(len);
+        for _ in 0..len {
+            vec.push(T::decode(&mut decoder)?);
+        }
+        Ok(vec)
+    }
+}
+
+impl<T> Encodeable for Vec<T>
+where
+    T: Encodeable,
+{
+    fn encode<E: Encode>(&self, mut encoder: E) -> Result<(), EncodeError> {
+        self.len().encode(&mut encoder)?;
+        for item in self.iter() {
+            item.encode(&mut encoder)?;
+        }
+        Ok(())
+    }
+}
+
+impl<'de, T> Decodable for Box<T>
+where
+    T: Decodable,
+{
+    fn decode<D: Decode>(decoder: D) -> Result<Self, DecodeError> {
+        let t = T::decode(decoder)?;
+        Ok(Box::new(t))
+    }
+}
+
+impl<T> Encodeable for Box<T>
+where
+    T: Encodeable,
+{
+    fn encode<E: Encode>(&self, encoder: E) -> Result<(), EncodeError> {
+        T::encode(self, encoder)
+    }
+}
+
+impl<'de, T> Decodable for Box<[T]>
+where
+    T: Decodable,
+{
+    fn decode<D: Decode>(decoder: D) -> Result<Self, DecodeError> {
+        let vec = Vec::decode(decoder)?;
+        Ok(vec.into_boxed_slice())
+    }
+}
+
+impl<T> Encodeable for Box<[T]>
+where
+    T: Encodeable,
+{
+    fn encode<E: Encode>(&self, mut encoder: E) -> Result<(), EncodeError> {
+        self.len().encode(&mut encoder)?;
+        for item in self.iter() {
+            item.encode(&mut encoder)?;
+        }
+        Ok(())
+    }
+}

tests/alloc.rs

@@ -1,5 +1,9 @@
 #![cfg(feature = "alloc")]
 
+mod utils;
+
+use utils::the_same;
+
 struct Foo {
     pub a: u32,
     pub b: u32,
@@ -34,3 +38,10 @@ fn test_vec() {
     assert_eq!(foo.a, 5);
     assert_eq!(foo.b, 10);
 }
+
+#[test]
+fn test_alloc_commons() {
+    the_same::<Vec<u32>>(vec![1, 2, 3, 4, 5]);
+    the_same(Box::<u32>::new(5));
+    the_same(Box::<[u32]>::from(vec![1, 2, 3, 4, 5]));
+}

tests/basic_types.rs

@@ -1,95 +1,6 @@
-use bincode::config::{self, Config};
-use core::fmt::Debug;
+mod utils;
 
-fn the_same_with_config<V, C>(element: V, config: C)
-where
-    V: bincode::enc::Encodeable
-        + for<'de> bincode::de::Decodable
-        + PartialEq
-        + Debug
-        + Clone
-        + 'static,
-    C: Config,
-{
-    let mut buffer = [0u8; 1024];
-    let len = bincode::encode_into_slice_with_config(element.clone(), &mut buffer, config).unwrap();
-    println!(
-        "{:?}: {:?} ({:?})",
-        element,
-        &buffer[..len],
-        core::any::type_name::<C>()
-    );
-    let decoded: V = bincode::decode_with_config(&mut buffer, config).unwrap();
-
-    assert_eq!(element, decoded);
-}
-fn the_same<V>(element: V)
-where
-    V: bincode::enc::Encodeable
-        + for<'de> bincode::de::Decodable
-        + PartialEq
-        + Debug
-        + Clone
-        + 'static,
-{
-    // A matrix of each different config option possible
-    the_same_with_config(
-        element.clone(),
-        config::Default
-            .with_little_endian()
-            .with_fixed_int_encoding()
-            .skip_fixed_array_length(),
-    );
-    the_same_with_config(
-        element.clone(),
-        config::Default
-            .with_big_endian()
-            .with_fixed_int_encoding()
-            .skip_fixed_array_length(),
-    );
-    the_same_with_config(
-        element.clone(),
-        config::Default
-            .with_little_endian()
-            .with_variable_int_encoding()
-            .skip_fixed_array_length(),
-    );
-    the_same_with_config(
-        element.clone(),
-        config::Default
-            .with_big_endian()
-            .with_variable_int_encoding()
-            .skip_fixed_array_length(),
-    );
-    the_same_with_config(
-        element.clone(),
-        config::Default
-            .with_little_endian()
-            .with_fixed_int_encoding()
-            .write_fixed_array_length(),
-    );
-    the_same_with_config(
-        element.clone(),
-        config::Default
-            .with_big_endian()
-            .with_fixed_int_encoding()
-            .write_fixed_array_length(),
-    );
-    the_same_with_config(
-        element.clone(),
-        config::Default
-            .with_little_endian()
-            .with_variable_int_encoding()
-            .write_fixed_array_length(),
-    );
-    the_same_with_config(
-        element,
-        config::Default
-            .with_big_endian()
-            .with_variable_int_encoding()
-            .write_fixed_array_length(),
-    );
-}
+use utils::the_same;
 
 #[test]
 fn test_numbers() {

tests/utils.rs

@@ -0,0 +1,93 @@
+use bincode::config::{self, Config};
+use core::fmt::Debug;
+
+fn the_same_with_config<V, C>(element: V, config: C)
+where
+    V: bincode::enc::Encodeable
+        + for<'de> bincode::de::Decodable
+        + PartialEq
+        + Debug
+        + Clone
+        + 'static,
+    C: Config,
+{
+    let mut buffer = [0u8; 1024];
+    let len = bincode::encode_into_slice_with_config(element.clone(), &mut buffer, config).unwrap();
+    println!(
+        "{:?}: {:?} ({:?})",
+        element,
+        &buffer[..len],
+        core::any::type_name::<C>()
+    );
+    let decoded: V = bincode::decode_with_config(&mut buffer, config).unwrap();
+
+    assert_eq!(element, decoded);
+}
+
+pub fn the_same<V>(element: V)
+where
+    V: bincode::enc::Encodeable
+        + for<'de> bincode::de::Decodable
+        + PartialEq
+        + Debug
+        + Clone
+        + 'static,
+{
+    // A matrix of each different config option possible
+    the_same_with_config(
+        element.clone(),
+        config::Default
+            .with_little_endian()
+            .with_fixed_int_encoding()
+            .skip_fixed_array_length(),
+    );
+    the_same_with_config(
+        element.clone(),
+        config::Default
+            .with_big_endian()
+            .with_fixed_int_encoding()
+            .skip_fixed_array_length(),
+    );
+    the_same_with_config(
+        element.clone(),
+        config::Default
+            .with_little_endian()
+            .with_variable_int_encoding()
+            .skip_fixed_array_length(),
+    );
+    the_same_with_config(
+        element.clone(),
+        config::Default
+            .with_big_endian()
+            .with_variable_int_encoding()
+            .skip_fixed_array_length(),
+    );
+    the_same_with_config(
+        element.clone(),
+        config::Default
+            .with_little_endian()
+            .with_fixed_int_encoding()
+            .write_fixed_array_length(),
+    );
+    the_same_with_config(
+        element.clone(),
+        config::Default
+            .with_big_endian()
+            .with_fixed_int_encoding()
+            .write_fixed_array_length(),
+    );
+    the_same_with_config(
+        element.clone(),
+        config::Default
+            .with_little_endian()
+            .with_variable_int_encoding()
+            .write_fixed_array_length(),
+    );
+    the_same_with_config(
+        element,
+        config::Default
+            .with_big_endian()
+            .with_variable_int_encoding()
+            .write_fixed_array_length(),
+    );
+}