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doc: make BitSet intro more short #65532

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Oct 19, 2019
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doc: make BitSet intro more short #65532

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7 changes: 5 additions & 2 deletions src/librustc_index/bit_set.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -13,15 +13,18 @@ pub type Word = u64;
pub const WORD_BYTES: usize = mem::size_of::<Word>();
pub const WORD_BITS: usize = WORD_BYTES * 8;

/// A fixed-size bitset type with a dense representation. It does not support
/// resizing after creation; use `GrowableBitSet` for that.
/// A fixed-size bitset type with a dense representation.
///
/// NOTE: Use [`GrowableBitSet`] if you need support for resizing after creation.
///
/// `T` is an index type, typically a newtyped `usize` wrapper, but it can also
/// just be `usize`.
///
/// All operations that involve an element will panic if the element is equal
/// to or greater than the domain size. All operations that involve two bitsets
/// will panic if the bitsets have differing domain sizes.
///
/// [`GrowableBitSet`]: struct.GrowableBitSet.html
#[derive(Clone, Eq, PartialEq, RustcDecodable, RustcEncodable)]
pub struct BitSet<T: Idx> {
domain_size: usize,
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