Editando: append.go
// run // Copyright 2010 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. // Semi-exhaustive test for the append predeclared function. package main import ( "fmt" "reflect" ) func verify(name string, result, expected interface{}) { if !reflect.DeepEqual(result, expected) { panic(name) } } func main() { for _, t := range tests { verify(t.name, t.result, t.expected) } verifyStruct() verifyInterface() verifyType() } var ( zero int = 0 one int = 1 ) var tests = []struct { name string result, expected interface{} }{ {"bool a", append([]bool{}), []bool{}}, {"bool b", append([]bool{}, true), []bool{true}}, {"bool c", append([]bool{}, true, false, true, true), []bool{true, false, true, true}}, {"bool d", append([]bool{true, false, true}), []bool{true, false, true}}, {"bool e", append([]bool{true, false, true}, false), []bool{true, false, true, false}}, {"bool f", append([]bool{true, false, true}, false, false, false), []bool{true, false, true, false, false, false}}, {"bool g", append([]bool{}, []bool{true}...), []bool{true}}, {"bool h", append([]bool{}, []bool{true, false, true, false}...), []bool{true, false, true, false}}, {"bool i", append([]bool{true, false, true}, []bool{true}...), []bool{true, false, true, true}}, {"bool j", append([]bool{true, false, true}, []bool{true, true, true}...), []bool{true, false, true, true, true, true}}, {"byte a", append([]byte{}), []byte{}}, {"byte b", append([]byte{}, 0), []byte{0}}, {"byte c", append([]byte{}, 0, 1, 2, 3), []byte{0, 1, 2, 3}}, {"byte d", append([]byte{0, 1, 2}), []byte{0, 1, 2}}, {"byte e", append([]byte{0, 1, 2}, 3), []byte{0, 1, 2, 3}}, {"byte f", append([]byte{0, 1, 2}, 3, 4, 5), []byte{0, 1, 2, 3, 4, 5}}, {"byte g", append([]byte{}, []byte{0}...), []byte{0}}, {"byte h", append([]byte{}, []byte{0, 1, 2, 3}...), []byte{0, 1, 2, 3}}, {"byte i", append([]byte{0, 1, 2}, []byte{3}...), []byte{0, 1, 2, 3}}, {"byte j", append([]byte{0, 1, 2}, []byte{3, 4, 5}...), []byte{0, 1, 2, 3, 4, 5}}, {"bytestr a", append([]byte{}, "0"...), []byte("0")}, {"bytestr b", append([]byte{}, "0123"...), []byte("0123")}, {"bytestr c", append([]byte("012"), "3"...), []byte("0123")}, {"bytestr d", append([]byte("012"), "345"...), []byte("012345")}, {"int16 a", append([]int16{}), []int16{}}, {"int16 b", append([]int16{}, 0), []int16{0}}, {"int16 c", append([]int16{}, 0, 1, 2, 3), []int16{0, 1, 2, 3}}, {"int16 d", append([]int16{0, 1, 2}), []int16{0, 1, 2}}, {"int16 e", append([]int16{0, 1, 2}, 3), []int16{0, 1, 2, 3}}, {"int16 f", append([]int16{0, 1, 2}, 3, 4, 5), []int16{0, 1, 2, 3, 4, 5}}, {"int16 g", append([]int16{}, []int16{0}...), []int16{0}}, {"int16 h", append([]int16{}, []int16{0, 1, 2, 3}...), []int16{0, 1, 2, 3}}, {"int16 i", append([]int16{0, 1, 2}, []int16{3}...), []int16{0, 1, 2, 3}}, {"int16 j", append([]int16{0, 1, 2}, []int16{3, 4, 5}...), []int16{0, 1, 2, 3, 4, 5}}, {"uint32 a", append([]uint32{}), []uint32{}}, {"uint32 b", append([]uint32{}, 0), []uint32{0}}, {"uint32 c", append([]uint32{}, 0, 1, 2, 3), []uint32{0, 1, 2, 3}}, {"uint32 d", append([]uint32{0, 1, 2}), []uint32{0, 1, 2}}, {"uint32 e", append([]uint32{0, 1, 2}, 3), []uint32{0, 1, 2, 3}}, {"uint32 f", append([]uint32{0, 1, 2}, 3, 4, 5), []uint32{0, 1, 2, 3, 4, 5}}, {"uint32 g", append([]uint32{}, []uint32{0}...), []uint32{0}}, {"uint32 h", append([]uint32{}, []uint32{0, 1, 2, 3}...), []uint32{0, 1, 2, 3}}, {"uint32 i", append([]uint32{0, 1, 2}, []uint32{3}...), []uint32{0, 1, 2, 3}}, {"uint32 j", append([]uint32{0, 1, 2}, []uint32{3, 4, 5}...), []uint32{0, 1, 2, 3, 4, 5}}, {"float64 a", append([]float64{}), []float64{}}, {"float64 b", append([]float64{}, 0), []float64{0}}, {"float64 c", append([]float64{}, 0, 1, 2, 3), []float64{0, 1, 2, 3}}, {"float64 d", append([]float64{0, 1, 2}), []float64{0, 1, 2}}, {"float64 e", append([]float64{0, 1, 2}, 3), []float64{0, 1, 2, 3}}, {"float64 f", append([]float64{0, 1, 2}, 3, 4, 5), []float64{0, 1, 2, 3, 4, 5}}, {"float64 g", append([]float64{}, []float64{0}...), []float64{0}}, {"float64 h", append([]float64{}, []float64{0, 1, 2, 3}...), []float64{0, 1, 2, 3}}, {"float64 i", append([]float64{0, 1, 2}, []float64{3}...), []float64{0, 1, 2, 3}}, {"float64 j", append([]float64{0, 1, 2}, []float64{3, 4, 5}...), []float64{0, 1, 2, 3, 4, 5}}, {"complex128 a", append([]complex128{}), []complex128{}}, {"complex128 b", append([]complex128{}, 0), []complex128{0}}, {"complex128 c", append([]complex128{}, 0, 1, 2, 3), []complex128{0, 1, 2, 3}}, {"complex128 d", append([]complex128{0, 1, 2}), []complex128{0, 1, 2}}, {"complex128 e", append([]complex128{0, 1, 2}, 3), []complex128{0, 1, 2, 3}}, {"complex128 f", append([]complex128{0, 1, 2}, 3, 4, 5), []complex128{0, 1, 2, 3, 4, 5}}, {"complex128 g", append([]complex128{}, []complex128{0}...), []complex128{0}}, {"complex128 h", append([]complex128{}, []complex128{0, 1, 2, 3}...), []complex128{0, 1, 2, 3}}, {"complex128 i", append([]complex128{0, 1, 2}, []complex128{3}...), []complex128{0, 1, 2, 3}}, {"complex128 j", append([]complex128{0, 1, 2}, []complex128{3, 4, 5}...), []complex128{0, 1, 2, 3, 4, 5}}, {"string a", append([]string{}), []string{}}, {"string b", append([]string{}, "0"), []string{"0"}}, {"string c", append([]string{}, "0", "1", "2", "3"), []string{"0", "1", "2", "3"}}, {"string d", append([]string{"0", "1", "2"}), []string{"0", "1", "2"}}, {"string e", append([]string{"0", "1", "2"}, "3"), []string{"0", "1", "2", "3"}}, {"string f", append([]string{"0", "1", "2"}, "3", "4", "5"), []string{"0", "1", "2", "3", "4", "5"}}, {"string g", append([]string{}, []string{"0"}...), []string{"0"}}, {"string h", append([]string{}, []string{"0", "1", "2", "3"}...), []string{"0", "1", "2", "3"}}, {"string i", append([]string{"0", "1", "2"}, []string{"3"}...), []string{"0", "1", "2", "3"}}, {"string j", append([]string{"0", "1", "2"}, []string{"3", "4", "5"}...), []string{"0", "1", "2", "3", "4", "5"}}, {"make a", append([]string{}, make([]string, 0)...), []string{}}, {"make b", append([]string(nil), make([]string, 0)...), []string(nil)}, {"make c", append([]struct{}{}, make([]struct{}, 0)...), []struct{}{}}, {"make d", append([]struct{}{}, make([]struct{}, 2)...), make([]struct{}, 2)}, {"make e", append([]int{0, 1}, make([]int, 0)...), []int{0, 1}}, {"make f", append([]int{0, 1}, make([]int, 2)...), []int{0, 1, 0, 0}}, {"make g", append([]*int{&zero, &one}, make([]*int, 0)...), []*int{&zero, &one}}, {"make h", append([]*int{&zero, &one}, make([]*int, 2)...), []*int{&zero, &one, nil, nil}}, } func verifyStruct() { type T struct { a, b, c string } type S []T e := make(S, 100) for i := range e { e[i] = T{"foo", fmt.Sprintf("%d", i), "bar"} } verify("struct a", append(S{}), S{}) verify("struct b", append(S{}, e[0]), e[0:1]) verify("struct c", append(S{}, e[0], e[1], e[2]), e[0:3]) verify("struct d", append(e[0:1]), e[0:1]) verify("struct e", append(e[0:1], e[1]), e[0:2]) verify("struct f", append(e[0:1], e[1], e[2], e[3]), e[0:4]) verify("struct g", append(e[0:3]), e[0:3]) verify("struct h", append(e[0:3], e[3]), e[0:4]) verify("struct i", append(e[0:3], e[3], e[4], e[5], e[6]), e[0:7]) for i := range e { verify("struct j", append(S{}, e[0:i]...), e[0:i]) input := make(S, i) copy(input, e[0:i]) verify("struct k", append(input, e[i:]...), e) verify("struct k - input modified", input, e[0:i]) } s := make(S, 10, 20) r := make(S, len(s)+len(e)) for i, x := range e { r[len(s)+i] = x } verify("struct l", append(s), s) verify("struct m", append(s, e...), r) } func verifyInterface() { type T interface{} type S []T e := make(S, 100) for i := range e { switch i % 4 { case 0: e[i] = i case 1: e[i] = "foo" case 2: e[i] = fmt.Sprintf("%d", i) case 3: e[i] = float64(i) } } verify("interface a", append(S{}), S{}) verify("interface b", append(S{}, e[0]), e[0:1]) verify("interface c", append(S{}, e[0], e[1], e[2]), e[0:3]) verify("interface d", append(e[0:1]), e[0:1]) verify("interface e", append(e[0:1], e[1]), e[0:2]) verify("interface f", append(e[0:1], e[1], e[2], e[3]), e[0:4]) verify("interface g", append(e[0:3]), e[0:3]) verify("interface h", append(e[0:3], e[3]), e[0:4]) verify("interface i", append(e[0:3], e[3], e[4], e[5], e[6]), e[0:7]) for i := range e { verify("interface j", append(S{}, e[0:i]...), e[0:i]) input := make(S, i) copy(input, e[0:i]) verify("interface k", append(input, e[i:]...), e) verify("interface k - input modified", input, e[0:i]) } s := make(S, 10, 20) r := make(S, len(s)+len(e)) for i, x := range e { r[len(s)+i] = x } verify("interface l", append(s), s) verify("interface m", append(s, e...), r) } type T1 []int type T2 []int func verifyType() { // The second argument to append has type []E where E is the // element type of the first argument. Test that the compiler // accepts two slice types that meet that requirement but are // not assignment compatible. The return type of append is // the type of the first argument. t1 := T1{1} t2 := T2{2} verify("T1", append(t1, t2...), T1{1, 2}) }
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