fix #26038, make isequal consistent with hash for Ptr (#26858)

JuliaLang · Apr 20, 2018 · 2953183 · 2953183
1 parent 8f46450
commit 2953183
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Showing 2 changed files with 20 additions and 2 deletions.
diff --git a/base/pointer.jl b/base/pointer.jl
@@ -145,9 +145,12 @@ end
 
 ## limited pointer arithmetic & comparison ##
 
+isequal(x::Ptr, y::Ptr) = (x === y)
+isless(x::Ptr{T}, y::Ptr{T}) where {T} = x < y
+
 ==(x::Ptr, y::Ptr) = UInt(x) == UInt(y)
-isless(x::Ptr, y::Ptr) = isless(UInt(x), UInt(y))
--(x::Ptr, y::Ptr) = UInt(x) - UInt(y)
+<(x::Ptr,  y::Ptr) = UInt(x) < UInt(y)
+-(x::Ptr,  y::Ptr) = UInt(x) - UInt(y)
 
 +(x::Ptr, y::Integer) = oftype(x, Intrinsics.add_ptr(UInt(x), (y % UInt) % UInt))
 -(x::Ptr, y::Integer) = oftype(x, Intrinsics.sub_ptr(UInt(x), (y % UInt) % UInt))

diff --git a/test/hashing.jl b/test/hashing.jl
@@ -223,3 +223,18 @@ let vals_expr = :(Any[Vector, (Array{T,1} where T), 1, 2, Union{Int, String}, Un
         @test (a === b) == (objectid(a) == objectid(b))
     end
 end
+
+# issue #26038
+let p1 = Ptr{Int8}(1), p2 = Ptr{Int32}(1), p3 = Ptr{Int8}(2)
+    @test p1 == p2
+    @test !isequal(p1, p2)
+    @test p1 != p3
+    @test hash(p1) != hash(p2)
+    @test hash(p1) != hash(p3)
+    @test hash(p1) == hash(Ptr{Int8}(1))
+
+    @test p1 < p3
+    @test !(p1 < p2)
+    @test isless(p1, p3)
+    @test_throws MethodError isless(p1, p2)
+end