How to use Zero method of got Package

Best Got code snippet using got.Zero

logic_test.go

Source:logic_test.go Github

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1package test2import "testing"3// Tests to make sure logic simplification rules are correct.4func TestLogic64(t *testing.T) {5	// test values to determine function equality6	values := [...]int64{-1 << 63, 1<<63 - 1, -4, -3, -2, -1, 0, 1, 2, 3, 4}7	// golden functions we use repeatedly8	zero := func(x int64) int64 { return 0 }9	id := func(x int64) int64 { return x }10	or := func(x, y int64) int64 { return x | y }11	and := func(x, y int64) int64 { return x & y }12	y := func(x, y int64) int64 { return y }13	for _, test := range [...]struct {14		name   string15		f      func(int64) int6416		golden func(int64) int6417	}{18		{"x|x", func(x int64) int64 { return x | x }, id},19		{"x|0", func(x int64) int64 { return x | 0 }, id},20		{"x|-1", func(x int64) int64 { return x | -1 }, func(x int64) int64 { return -1 }},21		{"x&x", func(x int64) int64 { return x & x }, id},22		{"x&0", func(x int64) int64 { return x & 0 }, zero},23		{"x&-1", func(x int64) int64 { return x & -1 }, id},24		{"x^x", func(x int64) int64 { return x ^ x }, zero},25		{"x^0", func(x int64) int64 { return x ^ 0 }, id},26		{"x^-1", func(x int64) int64 { return x ^ -1 }, func(x int64) int64 { return ^x }},27		{"x+0", func(x int64) int64 { return x + 0 }, id},28		{"x-x", func(x int64) int64 { return x - x }, zero},29		{"x*0", func(x int64) int64 { return x * 0 }, zero},30		{"^^x", func(x int64) int64 { return ^^x }, id},31	} {32		for _, v := range values {33			got := test.f(v)34			want := test.golden(v)35			if want != got {36				t.Errorf("[%s](%d)=%d, want %d", test.name, v, got, want)37			}38		}39	}40	for _, test := range [...]struct {41		name   string42		f      func(int64, int64) int6443		golden func(int64, int64) int6444	}{45		{"x|(x|y)", func(x, y int64) int64 { return x | (x | y) }, or},46		{"x|(y|x)", func(x, y int64) int64 { return x | (y | x) }, or},47		{"(x|y)|x", func(x, y int64) int64 { return (x | y) | x }, or},48		{"(y|x)|x", func(x, y int64) int64 { return (y | x) | x }, or},49		{"x&(x&y)", func(x, y int64) int64 { return x & (x & y) }, and},50		{"x&(y&x)", func(x, y int64) int64 { return x & (y & x) }, and},51		{"(x&y)&x", func(x, y int64) int64 { return (x & y) & x }, and},52		{"(y&x)&x", func(x, y int64) int64 { return (y & x) & x }, and},53		{"x^(x^y)", func(x, y int64) int64 { return x ^ (x ^ y) }, y},54		{"x^(y^x)", func(x, y int64) int64 { return x ^ (y ^ x) }, y},55		{"(x^y)^x", func(x, y int64) int64 { return (x ^ y) ^ x }, y},56		{"(y^x)^x", func(x, y int64) int64 { return (y ^ x) ^ x }, y},57		{"-(y-x)", func(x, y int64) int64 { return -(y - x) }, func(x, y int64) int64 { return x - y }},58		{"(x+y)-x", func(x, y int64) int64 { return (x + y) - x }, y},59		{"(y+x)-x", func(x, y int64) int64 { return (y + x) - x }, y},60	} {61		for _, v := range values {62			for _, w := range values {63				got := test.f(v, w)64				want := test.golden(v, w)65				if want != got {66					t.Errorf("[%s](%d,%d)=%d, want %d", test.name, v, w, got, want)67				}68			}69		}70	}71}72func TestLogic32(t *testing.T) {73	// test values to determine function equality74	values := [...]int32{-1 << 31, 1<<31 - 1, -4, -3, -2, -1, 0, 1, 2, 3, 4}75	// golden functions we use repeatedly76	zero := func(x int32) int32 { return 0 }77	id := func(x int32) int32 { return x }78	or := func(x, y int32) int32 { return x | y }79	and := func(x, y int32) int32 { return x & y }80	y := func(x, y int32) int32 { return y }81	for _, test := range [...]struct {82		name   string83		f      func(int32) int3284		golden func(int32) int3285	}{86		{"x|x", func(x int32) int32 { return x | x }, id},87		{"x|0", func(x int32) int32 { return x | 0 }, id},88		{"x|-1", func(x int32) int32 { return x | -1 }, func(x int32) int32 { return -1 }},89		{"x&x", func(x int32) int32 { return x & x }, id},90		{"x&0", func(x int32) int32 { return x & 0 }, zero},91		{"x&-1", func(x int32) int32 { return x & -1 }, id},92		{"x^x", func(x int32) int32 { return x ^ x }, zero},93		{"x^0", func(x int32) int32 { return x ^ 0 }, id},94		{"x^-1", func(x int32) int32 { return x ^ -1 }, func(x int32) int32 { return ^x }},95		{"x+0", func(x int32) int32 { return x + 0 }, id},96		{"x-x", func(x int32) int32 { return x - x }, zero},97		{"x*0", func(x int32) int32 { return x * 0 }, zero},98		{"^^x", func(x int32) int32 { return ^^x }, id},99	} {100		for _, v := range values {101			got := test.f(v)102			want := test.golden(v)103			if want != got {104				t.Errorf("[%s](%d)=%d, want %d", test.name, v, got, want)105			}106		}107	}108	for _, test := range [...]struct {109		name   string110		f      func(int32, int32) int32111		golden func(int32, int32) int32112	}{113		{"x|(x|y)", func(x, y int32) int32 { return x | (x | y) }, or},114		{"x|(y|x)", func(x, y int32) int32 { return x | (y | x) }, or},115		{"(x|y)|x", func(x, y int32) int32 { return (x | y) | x }, or},116		{"(y|x)|x", func(x, y int32) int32 { return (y | x) | x }, or},117		{"x&(x&y)", func(x, y int32) int32 { return x & (x & y) }, and},118		{"x&(y&x)", func(x, y int32) int32 { return x & (y & x) }, and},119		{"(x&y)&x", func(x, y int32) int32 { return (x & y) & x }, and},120		{"(y&x)&x", func(x, y int32) int32 { return (y & x) & x }, and},121		{"x^(x^y)", func(x, y int32) int32 { return x ^ (x ^ y) }, y},122		{"x^(y^x)", func(x, y int32) int32 { return x ^ (y ^ x) }, y},123		{"(x^y)^x", func(x, y int32) int32 { return (x ^ y) ^ x }, y},124		{"(y^x)^x", func(x, y int32) int32 { return (y ^ x) ^ x }, y},125		{"-(y-x)", func(x, y int32) int32 { return -(y - x) }, func(x, y int32) int32 { return x - y }},126		{"(x+y)-x", func(x, y int32) int32 { return (x + y) - x }, y},127		{"(y+x)-x", func(x, y int32) int32 { return (y + x) - x }, y},128	} {129		for _, v := range values {130			for _, w := range values {131				got := test.f(v, w)132				want := test.golden(v, w)133				if want != got {134					t.Errorf("[%s](%d,%d)=%d, want %d", test.name, v, w, got, want)135				}136			}137		}138	}139}140func TestLogic16(t *testing.T) {141	// test values to determine function equality142	values := [...]int16{-1 << 15, 1<<15 - 1, -4, -3, -2, -1, 0, 1, 2, 3, 4}143	// golden functions we use repeatedly144	zero := func(x int16) int16 { return 0 }145	id := func(x int16) int16 { return x }146	or := func(x, y int16) int16 { return x | y }147	and := func(x, y int16) int16 { return x & y }148	y := func(x, y int16) int16 { return y }149	for _, test := range [...]struct {150		name   string151		f      func(int16) int16152		golden func(int16) int16153	}{154		{"x|x", func(x int16) int16 { return x | x }, id},155		{"x|0", func(x int16) int16 { return x | 0 }, id},156		{"x|-1", func(x int16) int16 { return x | -1 }, func(x int16) int16 { return -1 }},157		{"x&x", func(x int16) int16 { return x & x }, id},158		{"x&0", func(x int16) int16 { return x & 0 }, zero},159		{"x&-1", func(x int16) int16 { return x & -1 }, id},160		{"x^x", func(x int16) int16 { return x ^ x }, zero},161		{"x^0", func(x int16) int16 { return x ^ 0 }, id},162		{"x^-1", func(x int16) int16 { return x ^ -1 }, func(x int16) int16 { return ^x }},163		{"x+0", func(x int16) int16 { return x + 0 }, id},164		{"x-x", func(x int16) int16 { return x - x }, zero},165		{"x*0", func(x int16) int16 { return x * 0 }, zero},166		{"^^x", func(x int16) int16 { return ^^x }, id},167	} {168		for _, v := range values {169			got := test.f(v)170			want := test.golden(v)171			if want != got {172				t.Errorf("[%s](%d)=%d, want %d", test.name, v, got, want)173			}174		}175	}176	for _, test := range [...]struct {177		name   string178		f      func(int16, int16) int16179		golden func(int16, int16) int16180	}{181		{"x|(x|y)", func(x, y int16) int16 { return x | (x | y) }, or},182		{"x|(y|x)", func(x, y int16) int16 { return x | (y | x) }, or},183		{"(x|y)|x", func(x, y int16) int16 { return (x | y) | x }, or},184		{"(y|x)|x", func(x, y int16) int16 { return (y | x) | x }, or},185		{"x&(x&y)", func(x, y int16) int16 { return x & (x & y) }, and},186		{"x&(y&x)", func(x, y int16) int16 { return x & (y & x) }, and},187		{"(x&y)&x", func(x, y int16) int16 { return (x & y) & x }, and},188		{"(y&x)&x", func(x, y int16) int16 { return (y & x) & x }, and},189		{"x^(x^y)", func(x, y int16) int16 { return x ^ (x ^ y) }, y},190		{"x^(y^x)", func(x, y int16) int16 { return x ^ (y ^ x) }, y},191		{"(x^y)^x", func(x, y int16) int16 { return (x ^ y) ^ x }, y},192		{"(y^x)^x", func(x, y int16) int16 { return (y ^ x) ^ x }, y},193		{"-(y-x)", func(x, y int16) int16 { return -(y - x) }, func(x, y int16) int16 { return x - y }},194		{"(x+y)-x", func(x, y int16) int16 { return (x + y) - x }, y},195		{"(y+x)-x", func(x, y int16) int16 { return (y + x) - x }, y},196	} {197		for _, v := range values {198			for _, w := range values {199				got := test.f(v, w)200				want := test.golden(v, w)201				if want != got {202					t.Errorf("[%s](%d,%d)=%d, want %d", test.name, v, w, got, want)203				}204			}205		}206	}207}208func TestLogic8(t *testing.T) {209	// test values to determine function equality210	values := [...]int8{-1 << 7, 1<<7 - 1, -4, -3, -2, -1, 0, 1, 2, 3, 4}211	// golden functions we use repeatedly212	zero := func(x int8) int8 { return 0 }213	id := func(x int8) int8 { return x }214	or := func(x, y int8) int8 { return x | y }215	and := func(x, y int8) int8 { return x & y }216	y := func(x, y int8) int8 { return y }217	for _, test := range [...]struct {218		name   string219		f      func(int8) int8220		golden func(int8) int8221	}{222		{"x|x", func(x int8) int8 { return x | x }, id},223		{"x|0", func(x int8) int8 { return x | 0 }, id},224		{"x|-1", func(x int8) int8 { return x | -1 }, func(x int8) int8 { return -1 }},225		{"x&x", func(x int8) int8 { return x & x }, id},226		{"x&0", func(x int8) int8 { return x & 0 }, zero},227		{"x&-1", func(x int8) int8 { return x & -1 }, id},228		{"x^x", func(x int8) int8 { return x ^ x }, zero},229		{"x^0", func(x int8) int8 { return x ^ 0 }, id},230		{"x^-1", func(x int8) int8 { return x ^ -1 }, func(x int8) int8 { return ^x }},231		{"x+0", func(x int8) int8 { return x + 0 }, id},232		{"x-x", func(x int8) int8 { return x - x }, zero},233		{"x*0", func(x int8) int8 { return x * 0 }, zero},234		{"^^x", func(x int8) int8 { return ^^x }, id},235	} {236		for _, v := range values {237			got := test.f(v)238			want := test.golden(v)239			if want != got {240				t.Errorf("[%s](%d)=%d, want %d", test.name, v, got, want)241			}242		}243	}244	for _, test := range [...]struct {245		name   string246		f      func(int8, int8) int8247		golden func(int8, int8) int8248	}{249		{"x|(x|y)", func(x, y int8) int8 { return x | (x | y) }, or},250		{"x|(y|x)", func(x, y int8) int8 { return x | (y | x) }, or},251		{"(x|y)|x", func(x, y int8) int8 { return (x | y) | x }, or},252		{"(y|x)|x", func(x, y int8) int8 { return (y | x) | x }, or},253		{"x&(x&y)", func(x, y int8) int8 { return x & (x & y) }, and},254		{"x&(y&x)", func(x, y int8) int8 { return x & (y & x) }, and},255		{"(x&y)&x", func(x, y int8) int8 { return (x & y) & x }, and},256		{"(y&x)&x", func(x, y int8) int8 { return (y & x) & x }, and},257		{"x^(x^y)", func(x, y int8) int8 { return x ^ (x ^ y) }, y},258		{"x^(y^x)", func(x, y int8) int8 { return x ^ (y ^ x) }, y},259		{"(x^y)^x", func(x, y int8) int8 { return (x ^ y) ^ x }, y},260		{"(y^x)^x", func(x, y int8) int8 { return (y ^ x) ^ x }, y},261		{"-(y-x)", func(x, y int8) int8 { return -(y - x) }, func(x, y int8) int8 { return x - y }},262		{"(x+y)-x", func(x, y int8) int8 { return (x + y) - x }, y},263		{"(y+x)-x", func(x, y int8) int8 { return (y + x) - x }, y},264	} {265		for _, v := range values {266			for _, w := range values {267				got := test.f(v, w)268				want := test.golden(v, w)269				if want != got {270					t.Errorf("[%s](%d,%d)=%d, want %d", test.name, v, w, got, want)271				}272			}273		}274	}275}...

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divbyzero.go

Source:divbyzero.go Github

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...3	"fmt"4	"runtime"5)6var failed = false7func checkDivByZero(f func()) (divByZero bool) {8	defer func() {9		if r := recover(); r != nil {10			if e, ok := r.(runtime.Error); ok && e.Error() == "runtime error: integer divide by zero" {11				divByZero = true12			}13		}14	}()15	f()16	return false17}18//go:noinline19func a(i uint, s []int) int {20	return s[i%uint(len(s))]21}22//go:noinline23func b(i uint, j uint) uint {24	return i / j25}26//go:noinline27func c(i int) int {28	return 7 / (i - i)29}30func main() {31	if got := checkDivByZero(func() { b(7, 0) }); !got {32		fmt.Printf("expected div by zero for b(7, 0), got no error\n")33		failed = true34	}35	if got := checkDivByZero(func() { b(7, 7) }); got {36		fmt.Printf("expected no error for b(7, 7), got div by zero\n")37		failed = true38	}39	if got := checkDivByZero(func() { a(4, nil) }); !got {40		fmt.Printf("expected div by zero for a(4, nil), got no error\n")41		failed = true42	}43	if got := checkDivByZero(func() { c(5) }); !got {44		fmt.Printf("expected div by zero for c(5), got no error\n")45		failed = true46	}47	if failed {48		panic("tests failed")49	}50}...

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divbyzero_test.go

Source:divbyzero_test.go Github

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2import (3	"runtime"4	"testing"5)6func checkDivByZero(f func()) (divByZero bool) {7	defer func() {8		if r := recover(); r != nil {9			if e, ok := r.(runtime.Error); ok && e.Error() == "runtime error: integer divide by zero" {10				divByZero = true11			}12		}13	}()14	f()15	return false16}17//go:noinline18func div_a(i uint, s []int) int {19	return s[i%uint(len(s))]20}21//go:noinline22func div_b(i uint, j uint) uint {23	return i / j24}25//go:noinline26func div_c(i int) int {27	return 7 / (i - i)28}29func TestDivByZero(t *testing.T) {30	if got := checkDivByZero(func() { div_b(7, 0) }); !got {31		t.Errorf("expected div by zero for b(7, 0), got no error\n")32	}33	if got := checkDivByZero(func() { div_b(7, 7) }); got {34		t.Errorf("expected no error for b(7, 7), got div by zero\n")35	}36	if got := checkDivByZero(func() { div_a(4, nil) }); !got {37		t.Errorf("expected div by zero for a(4, nil), got no error\n")38	}39	if got := checkDivByZero(func() { div_c(5) }); !got {40		t.Errorf("expected div by zero for c(5), got no error\n")41	}42}...

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Zero

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1import (2type got struct {3}4func (g *got) zero() {5}6func main() {7	g := got{1, 2}8	g.zero()9	fmt.Println(g.x, g.y)10}

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Zero

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1import (2type NodeL struct {3}4type List struct {5}6func ListPushBack(l *List, data int) {7	node := &NodeL{Data: data}8	if l.Head == nil {9	} else {10	}11}12func PrintList(l *List) {13	for node := l.Head; node != nil; node = node.Next {14		fmt.Print(node.Data)15		if node.Next != nil {16			fmt.Print(" -> ")17		}18	}19	fmt.Println()20}21func Zero(l *List) {22	if l.Head == nil {23	}24	for node.Next != nil {25		if node.Data == 0 {26			if node == l.Head {27			} else {28			}29		} else {30		}31	}32	if node.Data == 0 {33	}34}35func main() {36	l := &List{}37	ListPushBack(l, 1)38	ListPushBack(l, 0)39	ListPushBack(l, 2)40	ListPushBack(l, 3)41	ListPushBack(l, 0)42	ListPushBack(l, 4)43	ListPushBack(l, 0)44	ListPushBack(l, 5)

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Zero

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1import (2type Vertex struct {3}4func (v Vertex) Abs() float64 {5	return math.Sqrt(v.X*v.X + v.Y*v.Y)6}7func (v *Vertex) Scale(f float64) {8}9func (v *Vertex) Zero() {10}11func main() {12	v := Vertex{3, 4}13	v.Scale(10)14	fmt.Println(v.Abs())15	v.Zero()16	fmt.Println(v.Abs())17}

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1import "fmt"2type got struct {3}4func (g got) zero() {5}6func (g *got) pointer() {7}8func main() {9	g := got{10	}11	fmt.Println(g)12	g.zero()13	fmt.Println(g)14	g.pointer()15	fmt.Println(g)16}

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Zero

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1import (2type Vertex struct {3}4func (v Vertex) Abs() float64 {5	return math.Sqrt(v.X*v.X + v.Y*v.Y)6}7func Abs(v Vertex) float64 {8	return math.Sqrt(v.X*v.X + v.Y*v.Y)9}10func (v *Vertex) Scale(f float64) {11}12func Scale(v *Vertex, f float64) {13}14func (v *Vertex) Zero() {15}16func Zero(v *Vertex) {17}18func main() {19	v := Vertex{3, 4}20	fmt.Println(v.Abs())21	fmt.Println(Abs(v))22	v.Scale(10)23	fmt.Println(v.Abs())24	fmt.Println(Abs(v))25	Scale(&v, 10)26	fmt.Println(v.Abs())27	fmt.Println(Abs(v))28	v.Zero()29	fmt.Println(v.Abs())30	fmt.Println(Abs(v))31	Zero(&v)32	fmt.Println(v.Abs())33	fmt.Println(Abs(v))34}

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1import (2type Point struct {3}4func (p *Point) Distance(q Point) float64 {5	return math.Hypot(q.X-p.X, q.Y-p.Y)6}7func (p *Point) ScaleBy(factor float64) {8}9func (p *Point) MoveBy(x, y float64) {10}11func (p *Point) Print() {12	fmt.Println(p)13}14func (p *Point) Zero() {15}16func main() {17	p := Point{1, 2}18	p.Print()19	p.MoveBy(2, 3)20	p.Print()21	p.ScaleBy(2)22	p.Print()23	p.Zero()24	p.Print()25}

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1import (2type Vertex struct {3}4func (v Vertex) Abs() float64 {5	return math.Sqrt(v.X*v.X + v.Y*v.Y)6}7func (v *Vertex) Scale(f float64) {8}9func (v *Vertex) Zero() {10}11func main() {12	v := Vertex{3, 4}13	v.Scale(10)14	v.Zero()15	fmt.Println(v.Abs())16}

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1import (2type Vertex struct {3}4}5	return math.Sqrt(v.X*v.X + v.Y*v.Y)6}7func main() {8	fmt.Println(v, v.Abs())9}

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