vcg_auction/
traits.rs

1use std::ops::{Add, Sub};
2
3use num_traits::Zero;
4
5/// Trait with methods that take two references of the same type and returns the
6/// result of addition or subtraction. Used as a trait bound for [`Bid`]
7/// associated types.
8pub trait AddSubSelf {
9    fn add(&self, other: &Self) -> Self;
10    fn sub(&self, other: &Self) -> Self;
11}
12
13/// Implementation for any type that implements Add and Sub with itself, such as
14/// integer and floating point primitives.
15impl<T> AddSubSelf for T
16where
17    T: Add<Output = T> + Sub<Output = T> + Copy,
18{
19    fn add(&self, other: &Self) -> Self {
20        *self + *other
21    }
22    fn sub(&self, other: &Self) -> Self {
23        *self - *other
24    }
25}
26
27/// Trait for a bid that can be auctioned.
28pub trait Bid {
29    /// Identifier for bidders. E.g. strings or integers.
30    type Name: Eq;
31    /// Bid value. E.g. integers. Floats can be used with a type wrapper for
32    /// [`Ord`]. See the tests for an example.
33    type Value: Ord + AddSubSelf + Zero;
34    /// Identifier for items. E.g. strings or integers.
35    type Item: Eq;
36    /// Quantity of an item. E.g. integers or floats.
37    type Quantity: PartialOrd + AddSubSelf + Zero + Clone;
38
39    /// Get the name of the bidder.
40    fn bidder_name(&self) -> &Self::Name;
41    /// Get the value of the bid.
42    fn bid_value(&self) -> &Self::Value;
43    /// Get the items that are bid on, and their quantities
44    fn bid_items(&self) -> &[(Self::Item, Self::Quantity)];
45}
vcg_auction/traits.rs

vcg_auction/
traits.rs
