Trait rustc_mir_dataflow::JoinSemiLattice

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pub trait JoinSemiLattice: Eq {
    // Required method
    fn join(&mut self, other: &Self) -> bool;
}
Expand description

A partially ordered set that has a least upper bound for any pair of elements in the set.

Required Methods§

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fn join(&mut self, other: &Self) -> bool

Computes the least upper bound of two elements, storing the result in self and returning true if self has changed.

The lattice join operator is abbreviated as ∨.

Implementations on Foreign Types§

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impl<T: Idx> JoinSemiLattice for ChunkedBitSet<T>

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fn join(&mut self, other: &Self) -> bool

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impl<I: Idx, T: JoinSemiLattice> JoinSemiLattice for IndexVec<I, T>

A tuple (or list) of lattices is itself a lattice whose least upper bound is the concatenation of the least upper bounds of each element of the tuple (or list).

In other words: (A₀, A₁, …, Aₙ) ∨ (B₀, B₁, …, Bₙ) = (A₀∨B₀, A₁∨B₁, …, Aₙ∨Bₙ)

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fn join(&mut self, other: &Self) -> bool

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impl JoinSemiLattice for bool

A bool is a “two-point” lattice with true as the top element and false as the bottom:

     true
       |
     false
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fn join(&mut self, other: &Self) -> bool

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impl<T: Idx> JoinSemiLattice for BitSet<T>

A BitSet represents the lattice formed by the powerset of all possible values of the index type T ordered by inclusion. Equivalently, it is a tuple of “two-point” lattices, one for each possible value of T.

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fn join(&mut self, other: &Self) -> bool

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