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safe new for pow2 sized spsc queues #205

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safe new for pow2 sized spsc queues #205

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22 changes: 20 additions & 2 deletions src/spsc/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -276,7 +276,7 @@ where
}

macro_rules! impl_ {
($uxx:ident, $doc:tt $(,$unsf:ident)?) => {
($uxx:ident, $doc:tt, [$($size:literal),*] $(,$unsf:ident)?) => {
impl<T, const N: usize> Queue<T, $uxx, N> {
#[doc = $doc]
pub const $($unsf)* fn $uxx() -> Self {
Expand All @@ -287,6 +287,18 @@ macro_rules! impl_ {
}
}
}
$(
impl<T> Queue<T, $uxx, $size> {
#[doc = $doc]
pub const fn new() -> Self {
Self {
head: Atomic::new(0),
tail: Atomic::new(0),
buffer: MaybeUninit::uninit(),
}
}
}
)*

impl<T, const N: usize> Queue<T, $uxx, N> {
/// Returns a reference to the item in the front of the queue without dequeuing, or
Expand Down Expand Up @@ -417,14 +429,20 @@ impl<T, const N: usize> Queue<T, usize, N> {
impl_!(
u8,
"Creates an empty queue with a fixed capacity of `N`. **Safety**: Assumes `N <= u8::MAX`.",
[1, 2, 4, 8, 16, 32, 64, 128, 256],
unsafe
);
impl_!(
u16,
"Creates an empty queue with a fixed capacity of `N`. **Safety**: Assumes `N <= u16::MAX`.",
[1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536],
unsafe
);
impl_!(usize, "Creates an empty queue with a fixed capacity of `N`");
impl_!(
usize,
"Creates an empty queue with a fixed capacity of `N`",
[]
);

impl<T, U, U2, const N: usize, const N2: usize> PartialEq<Queue<T, U2, N2>> for Queue<T, U, N>
where
Expand Down