Merge pull request #41 from nhz2/main

Add support for `Base.uabs`

Author: JeffreySarnoff

src/SaferIntegers.jl

@@ -15,7 +15,7 @@ import Base: promote_rule,
     (~), (&), (|), (⊻), (>>>), (>>), (<<),
     (<), (<=), (==), (!=), (>=), (>),
     isequal, isless,
-    abs, abs2,
+    abs, abs2, uabs,
     (+), (-), (*), (/), (\), (^), 
     div, fld, fld1, cld, rem, mod, mod1, divrem, fldmod, fldmod1,
     zero, one, sizeof, typemax, typemin, widen,

src/cover.jl

@@ -1,4 +1,4 @@
-for OP in (:checked_abs, :checked_neg)
+for OP in (:checked_abs, :checked_neg, :uabs)
     @eval begin
        @inline function $OP(x::T) where T<:SafeInteger
             ix = baseint(x)

test/runtests.jl

@@ -314,6 +314,9 @@ end
 @testset "checked signed arithmetic" begin
     @test SaferIntegers.checked_neg(SafeInt16(7)) === SafeInt16(-7)
     @test SaferIntegers.checked_abs(SafeInt16(-7)) === SafeInt16(7)
+    @test SaferIntegers.uabs(SafeInt16(-7)) === SafeUInt16(7)
+    @test SaferIntegers.uabs(SafeUInt16(7)) === SafeUInt16(7)
+    @test SaferIntegers.uabs(SafeInt8(-128)) === SafeUInt8(128)
 
     @test SaferIntegers.checked_add(SafeInt32(7), SafeInt32(2)) === SafeInt32(7+2)
     @test SaferIntegers.checked_sub(SafeInt64(7), SafeInt64(2)) === SafeInt64(7-2)