vendor/rand/src/distributions/weighted.rs

   1 // Copyright 2018 Developers of the Rand project.
   2 //
   3 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   4 // https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   5 // <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
   6 // option. This file may not be copied, modified, or distributed
   7 // except according to those terms.
   8
   9 //! Weighted index sampling
  10 //!
  11 //! This module is deprecated. Use [`crate::distributions::WeightedIndex`] and
  12 //! [`crate::distributions::WeightedError`] instead.
  13
  14 pub use super::{WeightedIndex, WeightedError};
  15
  16 #[allow(missing_docs)]
  17 #[deprecated(since = "0.8.0", note = "moved to rand_distr crate")]
  18 pub mod alias_method {
  19     // This module exists to provide a deprecation warning which minimises
  20     // compile errors, but still fails to compile if ever used.
  21     use core::marker::PhantomData;
  22     use alloc::vec::Vec;
  23     use super::WeightedError;
  24
  25     #[derive(Debug)]
  26     pub struct WeightedIndex<W: Weight> {
  27         _phantom: PhantomData<W>,
  28     }
  29     impl<W: Weight> WeightedIndex<W> {
  30         pub fn new(_weights: Vec<W>) -> Result<Self, WeightedError> {
  31             Err(WeightedError::NoItem)
  32         }
  33     }
  34
  35     pub trait Weight {}
  36     macro_rules! impl_weight {
  37         () => {};
  38         ($T:ident, $($more:ident,)*) => {
  39             impl Weight for $T {}
  40             impl_weight!($($more,)*);
  41         };
  42     }
  43     impl_weight!(f64, f32,);
  44     impl_weight!(u8, u16, u32, u64, usize,);
  45     impl_weight!(i8, i16, i32, i64, isize,);
  46     #[cfg(not(target_os = "emscripten"))]
  47     impl_weight!(u128, i128,);
  48 }