Struct rustc_data_structures::bitvec::SparseBitMatrix
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pub struct SparseBitMatrix<R, C> where
R: Idx,
C: Idx, { /* fields omitted */ }
Methods
impl<R: Idx, C: Idx> SparseBitMatrix<R, C>
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pub fn new(rows: R, _columns: C) -> SparseBitMatrix<R, C>
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Create a new rows x columns
matrix, initially empty.
pub fn add(&mut self, row: R, column: C) -> bool
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Sets the cell at (row, column)
to true. Put another way, insert
column
to the bitset for row
.
Returns true if this changed the matrix, and false otherwise.
pub fn contains(&self, row: R, column: C) -> bool
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Do the bits from row
contain column
? Put another way, is
the matrix cell at (row, column)
true? Put yet another way,
if the matrix represents (transitive) reachability, can
row
reach column
?
pub fn merge(&mut self, read: R, write: R) -> bool
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Add the bits from row read
to the bits from row write
,
return true if anything changed.
This is used when computing transitive reachability because if
you have an edge write -> read
, because in that case
write
can reach everything that read
can (and
potentially more).
pub fn iter<'a>(&'a self, row: R) -> impl Iterator<Item = C> + 'a
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Iterates through all the columns set to true in a given row of the matrix.
Trait Implementations
impl<R: Clone, C: Clone> Clone for SparseBitMatrix<R, C> where
R: Idx,
C: Idx,
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R: Idx,
C: Idx,
fn clone(&self) -> SparseBitMatrix<R, C>
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Returns a copy of the value. Read more
fn clone_from(&mut self, source: &Self)
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Performs copy-assignment from source
. Read more
impl<R: Debug, C: Debug> Debug for SparseBitMatrix<R, C> where
R: Idx,
C: Idx,
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R: Idx,
C: Idx,
Auto Trait Implementations
impl<R, C> Send for SparseBitMatrix<R, C> where
C: Send,
C: Send,
impl<R, C> Sync for SparseBitMatrix<R, C> where
C: Sync,
C: Sync,