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//@ build-pass
#![crate_type = "lib"]
#![allow(arithmetic_overflow)]
pub trait BitSplit {
type Half;
fn merge(halves: [Self::Half; 2]) -> Self;
}
macro_rules! impl_ints {
($int:ty => $half:ty; $mask:expr) => {
impl BitSplit for $int {
type Half = $half;
#[inline]
fn merge(halves: [Self::Half; 2]) -> Self {
const HALF_SIZE: usize = std::mem::size_of::<$half>() * 8;
(halves[0] << HALF_SIZE) as $int | halves[1] as $int
}
}
};
}
impl_ints!(u128 => u64; 0x0000_0000_0000_0000_FFFF_FFFF_FFFF_FFFF);
impl_ints!( u64 => u32; 0x0000_0000_FFFF_FFFF);
impl_ints!( u32 => u16; 0x0000_FFFF);
impl_ints!( u16 => u8; 0x00FF);
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