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Add conversion between span::Id and NonZeroU64 #770

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Jun 27, 2020
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16 changes: 16 additions & 0 deletions tracing-core/src/span.rs
Original file line number Diff line number Diff line change
Expand Up @@ -68,12 +68,28 @@ impl Id {
Id(NonZeroU64::new(u).expect("span IDs must be > 0"))
}

/// Constructs a new span ID from the given `NonZeroU64`.
///
/// Unlike [`Id::from_u64`](#method.from_u64), this will never panic.
#[inline]
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Not convinced we need inline attributes for these --- I can't imagine them ever not being inlined. Not a blocker.

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I noticed the lack of #[inline] in this crate. In my experience, not having the attribute results in a function call, which is needless overhead. However, I haven't tested whether this is the case for newer compilers. I remember seeing a compiler issue tracking this behavior.

pub const fn from_non_zero_u64(id: NonZeroU64) -> Self {
Id(id)
}

// Allow `into` by-ref since we don't want to impl Copy for Id
#[allow(clippy::wrong_self_convention)]
/// Returns the span's ID as a `u64`.
pub fn into_u64(&self) -> u64 {
self.0.get()
}

// Allow `into` by-ref since we don't want to impl Copy for Id
#[allow(clippy::wrong_self_convention)]
/// Returns the span's ID as a `NonZeroU64`.
#[inline]
pub const fn into_non_zero_u64(&self) -> NonZeroU64 {
self.0
}
}

impl<'a> Into<Option<Id>> for &'a Id {
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