spacejson 0.0.14

Derive JSON interfaces for types
Documentation 
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use crate::{Json, Vec, collections::BTreeMap};
use anyhow::Result;
use core::fmt::Debug;
use serde::{Serialize, de::DeserializeOwned};

impl<K, V> Json<BTreeMap<K, V>> for BTreeMap<K, V>
where
    K: Serialize + DeserializeOwned + Ord + Debug,
    V: Serialize + DeserializeOwned + Debug,
{
    fn to_json(self) -> BTreeMap<K, V> {
        self
    }

    fn from_json(json: BTreeMap<K, V>) -> Result<Self> {
        Ok(json)
    }
}

impl<K, V> Json<Vec<(K, V)>> for BTreeMap<K, V>
where
    K: Serialize + DeserializeOwned + Ord + Debug,
    V: Serialize + DeserializeOwned + Debug,
{
    fn to_json(self) -> Vec<(K, V)> {
        self.into_iter().collect()
    }

    fn from_json(json: Vec<(K, V)>) -> Result<Self> {
        Ok(json.into_iter().collect())
    }
}

#[cfg(feature = "std")]
mod std_impl {
    use super::*;
    use std::{collections::HashMap, hash::Hash};

    impl<K, V> Json<HashMap<K, V>> for HashMap<K, V>
    where
        K: Serialize + DeserializeOwned + Eq + Hash + Debug,
        V: Serialize + DeserializeOwned + Debug,
    {
        fn to_json(self) -> HashMap<K, V> {
            self
        }

        fn from_json(json: HashMap<K, V>) -> Result<Self> {
            Ok(json)
        }
    }

    impl<K, V> Json<Vec<(K, V)>> for HashMap<K, V>
    where
        K: Serialize + DeserializeOwned + Eq + Hash + Debug,
        V: Serialize + DeserializeOwned + Debug,
    {
        fn to_json(self) -> Vec<(K, V)> {
            self.into_iter().collect()
        }

        fn from_json(json: Vec<(K, V)>) -> Result<Self> {
            Ok(json.into_iter().collect())
        }
    }
}