rand_core 0.10.1

Core random number generation traits and tools for implementation.
Documentation 
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//! The [`Word`] trait

/// A marker trait for supported "word" types.
///
/// This is implemented for: `u32`, `u64`.
pub trait Word: sealed::Sealed {}

impl Word for u32 {}
impl Word for u64 {}

mod sealed {
    /// Sealed trait implemented for `u32` and `u64`.
    pub trait Sealed: Default + Copy + TryFrom<usize> + Eq + core::hash::Hash {
        type Bytes: Default + Sized + AsRef<[u8]> + AsMut<[u8]>;

        fn from_le_bytes(bytes: Self::Bytes) -> Self;
        fn to_le_bytes(self) -> Self::Bytes;

        fn from_usize(val: usize) -> Self;
        fn into_usize(self) -> usize;
    }

    impl Sealed for u32 {
        type Bytes = [u8; 4];

        #[inline(always)]
        fn from_le_bytes(bytes: Self::Bytes) -> Self {
            Self::from_le_bytes(bytes)
        }
        #[inline(always)]
        fn to_le_bytes(self) -> Self::Bytes {
            Self::to_le_bytes(self)
        }

        #[inline(always)]
        fn from_usize(val: usize) -> Self {
            val.try_into().unwrap()
        }
        #[inline(always)]
        fn into_usize(self) -> usize {
            self.try_into().unwrap()
        }
    }

    impl Sealed for u64 {
        type Bytes = [u8; 8];

        #[inline(always)]
        fn from_le_bytes(bytes: Self::Bytes) -> Self {
            Self::from_le_bytes(bytes)
        }
        #[inline(always)]
        fn to_le_bytes(self) -> Self::Bytes {
            Self::to_le_bytes(self)
        }

        #[inline(always)]
        fn from_usize(val: usize) -> Self {
            val.try_into().unwrap()
        }
        #[inline(always)]
        fn into_usize(self) -> usize {
            self.try_into().unwrap()
        }
    }
}