faster iszero(::Bool) (#20437)

JuliaLang · Feb 4, 2017 · 23f2cd3 · 23f2cd3 · nanosoldier · Feb 5, 2017
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diff --git a/base/bool.jl b/base/bool.jl
@@ -76,6 +76,7 @@ signbit(x::Bool) = false
 sign(x::Bool) = x
 abs(x::Bool) = x
 abs2(x::Bool) = x
+iszero(x::Bool) = !x
 
 <(x::Bool, y::Bool) = y&!x
 <=(x::Bool, y::Bool) = y|!x

diff --git a/test/numbers.jl b/test/numbers.jl
@@ -52,6 +52,8 @@ const ≣ = isequal # convenient for comparing NaNs
 @test Bool(1//1) == true
 @test_throws InexactError Bool(1//2)
 
+@test iszero(false) && !iszero(true)
+
 # basic arithmetic
 @test 2 + 3 == 5
 @test 2.0 + 3.0 == 5.