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Add wrapped unary negation to unsigned integer types #9947

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Jan 12, 2021
Merged

Add wrapped unary negation to unsigned integer types #9947

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443c22b
Add wrapped unary negation to unsigned integer types
HertzDevil Nov 20, 2020
fe9bffa
Update src/int.cr
HertzDevil Nov 21, 2020
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44 changes: 44 additions & 0 deletions spec/std/uint_spec.cr
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Original file line number Diff line number Diff line change
Expand Up @@ -6,4 +6,48 @@ describe "UInt" do
(0_u32 <=> 0_u32).should eq(0)
(0_u32 <=> 1_u32).should eq(-1)
end

describe "&-" do
it "returns the wrapped negation" do
x = &-0_u32
x.should eq(0_u32)
x.should be_a(UInt32)

x = &-100_u8
x.should eq(156_u8)
x.should be_a(UInt8)

x = &-1_u8
x.should eq(255_u8)
x.should be_a(UInt8)

x = &-255_u8
x.should eq(1_u8)
x.should be_a(UInt8)

x = &-1_u16
x.should eq(65535_u16)
x.should be_a(UInt16)

x = &-65535_u16
x.should eq(1_u16)
x.should be_a(UInt16)

x = &-1_u32
x.should eq(4294967295_u32)
x.should be_a(UInt32)

x = &-4294967295_u32
x.should eq(1_u32)
x.should be_a(UInt32)

x = &-1_u64
x.should eq(18446744073709551615_u64)
x.should be_a(UInt64)

x = &-18446744073709551615_u64
x.should eq(1_u64)
x.should be_a(UInt64)
end
end
end
21 changes: 21 additions & 0 deletions src/int.cr
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Original file line number Diff line number Diff line change
Expand Up @@ -980,6 +980,10 @@ struct UInt8
Number.expand_div [Float32], Float32
Number.expand_div [Float64], Float64

def &-
0_u8 &- self
end

def abs
self
end
Expand Down Expand Up @@ -1020,6 +1024,10 @@ struct UInt16
Number.expand_div [Float32], Float32
Number.expand_div [Float64], Float64

def &-
0_u16 &- self
end

def abs
self
end
Expand Down Expand Up @@ -1060,6 +1068,10 @@ struct UInt32
Number.expand_div [Float32], Float32
Number.expand_div [Float64], Float64

def &-
0_u32 &- self
end

def abs
self
end
Expand Down Expand Up @@ -1100,6 +1112,10 @@ struct UInt64
Number.expand_div [Float32], Float32
Number.expand_div [Float64], Float64

def &-
0_u64 &- self
end

def abs
self
end
Expand Down Expand Up @@ -1141,6 +1157,11 @@ struct UInt128
Number.expand_div [Float32], Float32
Number.expand_div [Float64], Float64

def &-
# TODO: use 0_u128 &- self
UInt128.new(0) &- self
end

def abs
self
end
Expand Down