Struct rustc_mir_build::thir::pattern::_match::Matrix

pub(crate) struct Matrix<'p, 'tcx>(Vec<PatStack<'p, 'tcx>>);

A 2D matrix.

Implementations

impl<'p, 'tcx> Matrix<'p, 'tcx>

pub(crate) fn empty() -> Self

pub(crate) fn push(&mut self, row: PatStack<'p, 'tcx>)

Pushes a new row to the matrix. If the row starts with an or-pattern, this expands it.

fn heads<'a>(&'a self) -> impl Iterator<Item = &'a Pat<'tcx>> + Captures<'p>

Iterate over the first component of each row

fn specialize_wildcard(&self) -> Self

This computes D(self). See top of the file for explanations.

fn specialize_constructor(
    &self,
    cx: &mut MatchCheckCtxt<'p, 'tcx>,
    constructor: &Constructor<'tcx>,
    ctor_wild_subpatterns: &Fields<'p, 'tcx>
) -> Matrix<'p, 'tcx>

This computes S(constructor, self). See top of the file for explanations.

Trait Implementations

impl<'p, 'tcx> Clone for Matrix<'p, 'tcx>

fn clone(&self) -> Matrix<'p, 'tcx>

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'p, 'tcx> Debug for Matrix<'p, 'tcx>

Pretty-printer for matrices of patterns, example:

+++++++++++++++++++++++++++++
+ _     + []                +
+++++++++++++++++++++++++++++
+ true  + [First]           +
+++++++++++++++++++++++++++++
+ true  + [Second(true)]    +
+++++++++++++++++++++++++++++
+ false + [_]               +
+++++++++++++++++++++++++++++
+ _     + [_, _, tail @ ..] +
+++++++++++++++++++++++++++++

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'p, 'tcx> FromIterator<PatStack<'p, 'tcx>> for Matrix<'p, 'tcx>

fn from_iter<T>(iter: T) -> Self where
    T: IntoIterator<Item = PatStack<'p, 'tcx>>, 

Creates a value from an iterator.