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use serde::de::{Deserialize, Deserializer, Error, SeqAccess, Visitor};
use serde::ser::{Serialize, SerializeTuple, Serializer};
use std::fmt;
use std::marker::PhantomData;
pub trait BigArray<'de>: Sized {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer;
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: Deserializer<'de>;
}
macro_rules! big_array {
($($len:expr,)+) => {
$(
impl<'de, T> BigArray<'de> for [T; $len]
where T: Default + Copy + Serialize + Deserialize<'de>
{
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where S: Serializer
{
let mut seq = serializer.serialize_tuple(self.len())?;
for elem in &self[..] {
seq.serialize_element(elem)?;
}
seq.end()
}
fn deserialize<D>(deserializer: D) -> Result<[T; $len], D::Error>
where D: Deserializer<'de>
{
struct ArrayVisitor<T> {
element: PhantomData<T>,
}
impl<'de, T> Visitor<'de> for ArrayVisitor<T>
where T: Default + Copy + Deserialize<'de>
{
type Value = [T; $len];
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str(concat!("an array of length ", $len))
}
fn visit_seq<A>(self, mut seq: A) -> Result<[T; $len], A::Error>
where A: SeqAccess<'de>
{
let mut arr = [T::default(); $len];
for i in 0..$len {
arr[i] = seq.next_element()?
.ok_or_else(|| Error::invalid_length(i, &self))?;
}
Ok(arr)
}
}
let visitor = ArrayVisitor { element: PhantomData };
deserializer.deserialize_tuple($len, visitor)
}
}
)+
}
}
big_array! {
288, 512,
576, 1024,
}