Skip to content

add ToBag operator #123

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
muenchnerkindl merged 2 commits into from
Apr 6, 2026
Merged

add ToBag operator #123

Show file tree
Hide file tree
Changes from 1 commit
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
c1ccef2
add ToBag operator
muenchnerkindl Apr 6, 2026
a18ca6b
improve comment for ToBag operator
muenchnerkindl Apr 6, 2026
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
9 changes: 8 additions & 1 deletion modules/SequencesExt.tla
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
---------------------------- MODULE SequencesExt ----------------------------
EXTENDS Sequences, Naturals, FiniteSets, FiniteSetsExt, Folds, Functions
EXTENDS Sequences, Naturals, FiniteSets, FiniteSetsExt, Folds, Functions, Bags
\* TLAPM does not play well with LOCAL INSTANCE, reinstate the following
\* when that issue is fixed.
\* LOCAL INSTANCE Sequences
Expand All @@ -8,6 +8,7 @@ EXTENDS Sequences, Naturals, FiniteSets, FiniteSetsExt, Folds, Functions
\* LOCAL INSTANCE FiniteSetsExt
\* LOCAL INSTANCE Folds
\* LOCAL INSTANCE Functions
\* LOCAL INSTANCE Bags
LOCAL INSTANCE TLC
(*************************************************************************)
(* Imports the definitions from the modules, but doesn't export them. *)
Expand All @@ -33,6 +34,12 @@ LOCAL INSTANCE TLC
ToSet(s) ==
{ s[i] : i \in DOMAIN s }

(**************************************************************************)
(* Convert a sequence to the bag of its elements. *)
Comment thread
lemmy marked this conversation as resolved.
Outdated
(**************************************************************************)
ToBag(s) ==
[x \in Range(s) |-> Cardinality({i \in DOMAIN s : s[i] = x})]

(**************************************************************************)
(* Convert a set to some sequence that contains all the elements of the *)
(* set exactly once, and contains no other elements. *)
Expand Down
4 changes: 4 additions & 0 deletions tests/SequencesExtTests.tla
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,10 @@ ASSUME(ToSet([i \in 1..10 |-> i]) = 1..10)
ASSUME(ToSet(Tail([i \in 1..10 |-> i])) = 2..10)
ASSUME(ToSet([i \in 0..9 |-> 42]) = {42})

ASSUME(ToBag(<<>>) = <<>>)
ASSUME(ToBag(<<1,2,1>>) = (1 :> 2) @@ (2 :> 1))
ASSUME(ToBag([i \in 1..10 |-> 42]) = (42 :> 10))

ASSUME(SetToSeq({}) = <<>>)
ASSUME(SetToSeq({1}) = <<1>>)
ASSUME(LET s == {"t","l","a","p","l","u","s"}
Expand Down
Loading