diff options
Diffstat (limited to 'lib/fixed-points.nix')
| -rw-r--r-- | lib/fixed-points.nix | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/lib/fixed-points.nix b/lib/fixed-points.nix index 7169c46fcbb..2f818c88de5 100644 --- a/lib/fixed-points.nix +++ b/lib/fixed-points.nix @@ -24,6 +24,16 @@ rec { # for a concrete example. fix' = f: let x = f x // { __unfix__ = f; }; in x; + # Return the fixpoint that `f` converges to when called recursively, starting + # with the input `x`. + # + # nix-repl> converge (x: x / 2) 16 + # 0 + converge = f: x: + if (f x) == x + then x + else converge f (f x); + # Modify the contents of an explicitly recursive attribute set in a way that # honors `self`-references. This is accomplished with a function # |