// Copyright 2018 Developers of the Rand project.

//

// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or

// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license

// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your

// option. This file may not be copied, modified, or distributed

// except according to those terms.

//! Weighted index sampling

//!

//! This module is deprecated. Use [`crate::distributions::WeightedIndex`] and

//! [`crate::distributions::WeightedError`] instead.

pub use super::{WeightedIndex, WeightedError};

#[allow(missing_docs)]

#[deprecated(since = "0.8.0", note = "moved to rand_distr crate")]

pub mod alias_method {

    // This module exists to provide a deprecation warning which minimises

    // compile errors, but still fails to compile if ever used.

    use core::marker::PhantomData;

    use alloc::vec::Vec;

    use super::WeightedError;

    #[derive(Debug)]

    pub struct WeightedIndex<W: Weight> {

        _phantom: PhantomData<W>,

    }

    impl<W: Weight> WeightedIndex<W> {

        pub fn new(_weights: Vec<W>) -> Result<Self, WeightedError> {

            Err(WeightedError::NoItem)

        }

    }

    pub trait Weight {}

    macro_rules! impl_weight {

        () => {};

        ($T:ident, $($more:ident,)*) => {

            impl Weight for $T {}

            impl_weight!($($more,)*);

        };

    }

    impl_weight!(f64, f32,);

    impl_weight!(u8, u16, u32, u64, usize,);

    impl_weight!(i8, i16, i32, i64, isize,);

    impl_weight!(u128, i128,);

}