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//! <div align="center"> //! <a href="https://github.com/udoprog/serde-hashkey/actions"> //! <img alt="GitHub Actions Build Status" src="https://github.com/udoprog/serde-hashkey/workflows/Build/badge.svg"> //! </a> //! //! <a href="https://docs.rs/serde-hashkey"> //! <img alt="Documentation" src="https://docs.rs/serde-hashkey/badge.svg"> //! </a> //! </div> //! //! Serde-based in-memory key serialization which supports hashing. //! //! This allows any serde-serializable type to be converted into a value which //! implements `PartialEq`, `Eq`, `ParialOrd`, `Ord`, and `Hash`. //! //! [Key] is useful because it allows for a form of type-erasure. Let's say you //! want to build a generic in-memory key-value store where you want to store //! arbitrary serde-serializable keys. This is typical for things like caches or //! dependency injection frameworks. //! //! ## Float policies //! //! By default, [Key] can't include floating point types such as `f32` and //! `f64`. Neither of these are [totally ordered nor hashable]. //! //! To enable the [Key] type to use `f32` and `f64` it can be constructed with a //! specific float policy. //! //! Available float policies are: //! * [RejectFloat] - the default behavior when using [to_key]. //! * [OrderedFloat] - the behavior when using [to_key_with_ordered_float]. The //! `ordered-float` feature must be enabled to use this. The behavior is //! derived from the [`ordered-float` crate]. //! //! ## Features //! //! * `ordered-float` - Enables serializing floating point numbers through //! behavior derived from the [`ordered-float` crate] //! //! ## Examples //! //! > You can run this example with `cargo run --example book` //! //! ```rust //! use serde_derive::{Deserialize, Serialize}; //! use serde_hashkey::{from_key, to_key, Error, Key}; //! use std::{collections::HashMap, error}; //! //! #[derive(Debug, PartialEq, Eq, Serialize, Deserialize)] //! struct Author { //! name: String, //! age: u32, //! } //! //! #[derive(Debug, PartialEq, Eq, Serialize, Deserialize)] //! struct Book { //! title: String, //! author: Author, //! } //! //! fn main() -> Result<(), Box<dyn error::Error>> { //! let book = Book { //! title: String::from("Birds of a feather"), //! author: Author { //! name: String::from("Noah"), //! age: 42, //! }, //! }; //! //! let key = to_key(&book)?; //! //! let mut ratings = HashMap::new(); //! ratings.insert(key.clone(), 5); //! //! println!("ratings: {:?}", ratings); //! //! println!( //! "book as json (through key): {}", //! serde_json::to_string_pretty(&key)? //! ); //! //! println!( //! "book as json (through original object): {}", //! serde_json::to_string_pretty(&book)? //! ); //! //! Ok(()) //! } //! ``` //! //! [totally ordered nor hashable]: https://internals.rust-lang.org/t/f32-f64-should-implement-hash/5436 //! [Key]: https://docs.rs/serde-hashkey/0/serde_hashkey/enum.Key.html //! [to_key]: https://docs.rs/serde-hashkey/0/serde_hashkey/fn.to_key.html //! [RejectFloat]: https://docs.rs/serde-hashkey/0/serde_hashkey/enum.RejectFloat.html //! [OrderedFloat]: https://docs.rs/serde-hashkey/0/serde_hashkey/enum.OrderedFloat.html //! [to_key_with_ordered_float]: https://docs.rs/serde-hashkey/0/serde_hashkey/fn.to_key_with_ordered_float.html //! [`ordered-float` crate]: https://docs.rs/ordered-float/2/ordered_float/ #![deny(missing_docs)] mod de; mod error; mod float; mod key; mod ser; #[doc(inline)] pub use crate::de::from_key; #[doc(inline)] pub use crate::error::{Error, Result}; #[cfg(feature = "ordered-float")] pub use crate::float::{to_key_with_ordered_float, OrderedFloat, OrderedFloatPolicy}; pub use crate::float::{FloatPolicy, FloatRepr, NeverFloat, RejectFloatPolicy}; #[doc(inline)] pub use crate::key::{Float, Integer, Key}; #[doc(inline)] pub use crate::ser::to_key;