Struct rustc_data_structures::bitvec::BitMatrix [−][src]
A "bit matrix" is basically a matrix of booleans represented as
one gigantic bitvector. In other words, it is as if you have
rows
bitvectors, each of length columns
.
Methods
impl<R: Idx, C: Idx> BitMatrix<R, C>
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impl<R: Idx, C: Idx> BitMatrix<R, C>
pub fn new(rows: usize, columns: usize) -> BitMatrix<R, C>
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pub fn new(rows: usize, columns: usize) -> BitMatrix<R, C>
Create a new rows x columns
matrix, initially empty.
pub fn add(&mut self, row: R, column: R) -> bool
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pub fn add(&mut self, row: R, column: R) -> bool
Sets the cell at (row, column)
to true. Put another way, add
column
to the bitset for row
.
Returns true if this changed the matrix, and false otherwise.
pub fn contains(&self, row: R, column: R) -> bool
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pub fn contains(&self, row: R, column: R) -> bool
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 intersection(&self, a: R, b: R) -> Vec<C>
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pub fn intersection(&self, a: R, b: R) -> Vec<C>
Returns those indices that are true in rows a
and b
. This
is an O(n) operation where n
is the number of elements
(somewhat independent from the actual size of the
intersection, in particular).
pub fn merge(&mut self, read: R, write: R) -> bool
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pub fn merge(&mut self, read: R, write: R) -> bool
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).
ⓘImportant traits for BitIter<'a, C>pub fn iter<'a>(&'a self, row: R) -> BitIter<'a, C>
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pub fn iter<'a>(&'a self, row: R) -> BitIter<'a, C>
Iterates through all the columns set to true in a given row of the matrix.
Trait Implementations
impl<R: Clone + Idx, C: Clone + Idx> Clone for BitMatrix<R, C>
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impl<R: Clone + Idx, C: Clone + Idx> Clone for BitMatrix<R, C>
fn clone(&self) -> BitMatrix<R, C>
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fn clone(&self) -> BitMatrix<R, C>
Returns a copy of the value. Read more
fn clone_from(&mut self, source: &Self)
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fn clone_from(&mut self, source: &Self)
Performs copy-assignment from source
. Read more
impl<R: Debug + Idx, C: Debug + Idx> Debug for BitMatrix<R, C>
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impl<R: Debug + Idx, C: Debug + Idx> Debug for BitMatrix<R, C>