make MultiplicativeInverse<:Number (#48708)

* make `MultiplicativeInverse<:Number` This makes operations like `divrem.(3, Base.MultiplicativeInverses.multiplicativeinverse(3))` work.
JuliaLang · Feb 24, 2023 · f0eadd0 · f0eadd0 · nanosoldier · Feb 24, 2023
1 parent b5482c8
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diff --git a/base/multinverses.jl b/base/multinverses.jl
@@ -14,7 +14,7 @@ unsigned(::Type{Int64}) = UInt64
 unsigned(::Type{Int128}) = UInt128
 unsigned(::Type{T}) where {T<:Unsigned} = T
 
-abstract type MultiplicativeInverse{T} end
+abstract type MultiplicativeInverse{T} <: Number end
 
 # Computes integer division by a constant using multiply, add, and bitshift.
 

diff --git a/test/numbers.jl b/test/numbers.jl
@@ -2493,6 +2493,8 @@ Base.abs(x::TestNumber) = TestNumber(abs(x.inner))
  @test_throws ArgumentError Base.multiplicativeinverse(0)
  testmi(map(UInt32, 0:1000), map(UInt32, 1:100))
  testmi(typemax(UInt32)-UInt32(1000):typemax(UInt32), map(UInt32, 1:100))
+ # test broadcasting works.
+ @test div.(3, Base.multiplicativeinverse(3)) == 1
 end
 @testset "ndims/indices/size/length" begin
  @test ndims(1) == 0