Comment on what in! does

JuliaLang · May 3, 2022 · 709daeb · 709daeb
1 parent d3ff474
commit 709daeb
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/base/set.jl b/base/set.jl
@@ -65,6 +65,8 @@ isempty(s::Set) = isempty(s.dict)
 length(s::Set)  = length(s.dict)
 in(x, s::Set) = haskey(s.dict, x)
 
+# This avoids hashing and probing twice and it works the same as
+# in!(x, s::Set) = in(x, s) ? true : (push!(s, x); false)
 function in!(x, s::Set)
     idx, sh = ht_keyindex2_shorthash!(s.dict, x)
     idx > 0 && return true