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    // Copyright 2018 Developers of the Rand project.
    // Copyright 2017-2018 The Rust Project Developers.
    //
    // 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.

    //! ISAAC helper functions for 256-element arrays.

    // Terrible workaround because arrays with more than 32 elements do not
    // implement `AsRef`, `Default`, `Serialize`, `Deserialize`, or any other
    // traits for that matter.

    #[cfg(feature="serde1")] use serde::{Serialize, Deserialize};

    const RAND_SIZE_LEN: usize = 8;
    const RAND_SIZE: usize = 1 << RAND_SIZE_LEN;

    #[derive(Copy, Clone)]
    #[allow(missing_debug_implementations)]
    #[cfg_attr(feature="serde1", derive(Serialize, Deserialize))]
    pub struct IsaacArray<T> {
        #[cfg_attr(feature="serde1",serde(with="isaac_array_serde"))]
        #[cfg_attr(feature="serde1", serde(bound(
            serialize = "T: Serialize",
            deserialize = "T: Deserialize<'de> + Copy + Default")))]
        inner: [T; RAND_SIZE]
    }

    impl<T> ::core::convert::AsRef<[T]> for IsaacArray<T> {
        #[inline(always)]
        fn as_ref(&self) -> &[T] {
            &self.inner[..]
        }
    }

    impl<T> ::core::convert::AsMut<[T]> for IsaacArray<T> {
        #[inline(always)]
        fn as_mut(&mut self) -> &mut [T] {
            &mut self.inner[..]
        }
    }

    impl<T> ::core::ops::Deref for IsaacArray<T> {
        type Target = [T; RAND_SIZE];
        #[inline(always)]
        fn deref(&self) -> &Self::Target {
            &self.inner
        }
    }

    impl<T> ::core::ops::DerefMut for IsaacArray<T> {
        #[inline(always)]
        fn deref_mut(&mut self) -> &mut [T; RAND_SIZE] {
            &mut self.inner
        }
    }

    impl<T> ::core::default::Default for IsaacArray<T> where T: Copy + Default {
        fn default() -> IsaacArray<T> {
            IsaacArray { inner: [T::default(); RAND_SIZE] }
        }
    }

    #[cfg(feature="serde1")]
    pub(super) mod isaac_array_serde {
        const RAND_SIZE_LEN: usize = 8;
        const RAND_SIZE: usize = 1 << RAND_SIZE_LEN;

        use serde::{Deserialize, Deserializer, Serialize, Serializer};
        use serde::de::{Visitor,SeqAccess};
        use serde::de;

        use core::fmt;

        pub fn serialize<T, S>(arr: &[T;RAND_SIZE], ser: S) -> Result<S::Ok, S::Error>
        where
            T: Serialize,
            S: Serializer
        {
            use serde::ser::SerializeTuple;

            let mut seq = ser.serialize_tuple(RAND_SIZE)?;

            for e in arr.iter() {
                seq.serialize_element(&e)?;
            }

            seq.end()
        }

        #[inline]
        pub fn deserialize<'de, T, D>(de: D) -> Result<[T;RAND_SIZE], D::Error>
        where
            T: Deserialize<'de>+Default+Copy,
            D: Deserializer<'de>,
        {
            use core::marker::PhantomData;
            struct ArrayVisitor<T> {
                _pd: PhantomData<T>,
            };
            impl<'de,T> Visitor<'de> for ArrayVisitor<T>
            where
                T: Deserialize<'de>+Default+Copy
            {
                type Value = [T; RAND_SIZE];

                fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
                    formatter.write_str("Isaac state array")
                }

                #[inline]
                fn visit_seq<A>(self, mut seq: A) -> Result<[T; RAND_SIZE], A::Error>
                where
                    A: SeqAccess<'de>,
                {
                    let mut out = [Default::default();RAND_SIZE];

                    for i in 0..RAND_SIZE {
                        match seq.next_element()? {
                            Some(val) => out[i] = val,
                            None => return Err(de::Error::invalid_length(i, &self)),
                        };
                    }

                    Ok(out)
                }
            }

            de.deserialize_tuple(RAND_SIZE, ArrayVisitor{_pd: PhantomData})
        }
    }

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