serde_hashkey/float/
float_repr.rs

1use crate::error::Error;
2use serde::{de, ser};
3use std::cmp;
4use std::fmt;
5use std::hash;
6
7/// Trait implemented by floating point types which can be used in a
8/// [FloatPolicy]. This is implemented by the type representing a float,
9/// typically a wrapper, and defines the protocol necessary to incorporate the
10/// floating point type `T` into the [Key] protocol.
11///
12/// [Key]: crate::Key
13/// [FloatPolicy]: crate::FloatPolicy
14pub trait FloatRepr<T>:
15    self::private::Sealed<T>
16    + Copy
17    + Sized
18    + fmt::Debug
19    + ser::Serialize
20    + cmp::Eq
21    + cmp::Ord
22    + hash::Hash
23{
24    /// Serialize impl for a floating point value.
25    fn serialize(value: T) -> Result<Self, Error>;
26
27    /// Visit the current value.
28    fn visit<'de, V>(&self, visitor: V) -> Result<V::Value, Error>
29    where
30        V: de::Visitor<'de>;
31}
32
33// NB: we completely seal the FloatPolicy to prevent external implementations.
34mod private {
35    pub trait Sealed<A> {}
36    impl<T, A> Sealed<A> for T where T: super::FloatRepr<A> {}
37}