mirror of
https://github.com/golang/go
synced 2024-11-22 19:14:53 -07:00
e24977d231
The next CL will remove the -G flag, effectively hard-coding it to its current default (-G=3). Change-Id: Ib4743b529206928f9f1cca9fdb19989728327831 Reviewed-on: https://go-review.googlesource.com/c/go/+/388534 Reviewed-by: Keith Randall <khr@golang.org> Trust: Matthew Dempsky <mdempsky@google.com> Run-TryBot: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Gopher Robot <gobot@golang.org>
82 lines
1.5 KiB
Go
82 lines
1.5 KiB
Go
// run
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// Copyright 2021 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package main
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import (
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"fmt"
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)
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// Index returns the index of x in s, or -1 if not found.
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func Index[T comparable](s []T, x T) int {
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for i, v := range s {
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// v and x are type T, which has the comparable
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// constraint, so we can use == here.
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if v == x {
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return i
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}
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}
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return -1
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}
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type obj struct {
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x int
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}
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type obj2 struct {
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x int8
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y float64
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}
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type obj3 struct {
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x int64
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y int8
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}
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type inner struct {
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y int64
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z int32
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}
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type obj4 struct {
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x int32
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s inner
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}
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func main() {
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want := 2
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vec1 := []string{"ab", "cd", "ef"}
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if got := Index(vec1, "ef"); got != want {
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panic(fmt.Sprintf("got %d, want %d", got, want))
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}
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vec2 := []byte{'c', '6', '@'}
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if got := Index(vec2, '@'); got != want {
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panic(fmt.Sprintf("got %d, want %d", got, want))
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}
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vec3 := []*obj{&obj{2}, &obj{42}, &obj{1}}
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if got := Index(vec3, vec3[2]); got != want {
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panic(fmt.Sprintf("got %d, want %d", got, want))
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}
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vec4 := []obj2{obj2{2, 3.0}, obj2{3, 4.0}, obj2{4, 5.0}}
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if got := Index(vec4, vec4[2]); got != want {
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panic(fmt.Sprintf("got %d, want %d", got, want))
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}
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vec5 := []obj3{obj3{2, 3}, obj3{3, 4}, obj3{4, 5}}
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if got := Index(vec5, vec5[2]); got != want {
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panic(fmt.Sprintf("got %d, want %d", got, want))
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}
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vec6 := []obj4{obj4{2, inner{3, 4}}, obj4{3, inner{4, 5}}, obj4{4, inner{5, 6}}}
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if got := Index(vec6, vec6[2]); got != want {
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panic(fmt.Sprintf("got %d, want %d", got, want))
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}
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}
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