67 lines
2.4 KiB
Rust
67 lines
2.4 KiB
Rust
use std::fmt;
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use std::marker::PhantomData;
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use serde::ser::{Serialize, Serializer, SerializeTuple};
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use serde::de::{Deserialize, Deserializer, Visitor, SeqAccess, Error};
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pub trait BigArray<'de>: Sized {
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fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
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where S: Serializer;
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fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
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where D: Deserializer<'de>;
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}
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macro_rules! big_array {
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($($len:expr,)+) => {
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$(
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impl<'de, T> BigArray<'de> for [T; $len]
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where T: Default + Copy + Serialize + Deserialize<'de>
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{
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fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
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where S: Serializer
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{
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let mut seq = serializer.serialize_tuple(self.len())?;
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for elem in &self[..] {
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seq.serialize_element(elem)?;
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}
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seq.end()
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}
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fn deserialize<D>(deserializer: D) -> Result<[T; $len], D::Error>
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where D: Deserializer<'de>
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{
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struct ArrayVisitor<T> {
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element: PhantomData<T>,
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}
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impl<'de, T> Visitor<'de> for ArrayVisitor<T>
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where T: Default + Copy + Deserialize<'de>
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{
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type Value = [T; $len];
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fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
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formatter.write_str(concat!("an array of length ", $len))
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}
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fn visit_seq<A>(self, mut seq: A) -> Result<[T; $len], A::Error>
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where A: SeqAccess<'de>
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{
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let mut arr = [T::default(); $len];
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for i in 0..$len {
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arr[i] = seq.next_element()?
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.ok_or_else(|| Error::invalid_length(i, &self))?;
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}
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Ok(arr)
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}
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}
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let visitor = ArrayVisitor { element: PhantomData };
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deserializer.deserialize_tuple($len, visitor)
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}
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}
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)+
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}
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}
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big_array! {
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496, 500, 512,
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} |