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https://github.com/golang/go
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8767b87ab5
Created functions to create GC shape type and names, based on a proposal from Keith. Kept unsigned and signed integer types as different, since they have different shift operations. Included adding in alignment fields where padding is required between fields, even though that seems like it will be fairly uncommon to use. Added some extra unusual struct typeparams (for testing the gcshape names/types) in index.go test. Change-Id: I8132bbd28098bd933435b8972ac5cc0b39f4c0df Reviewed-on: https://go-review.googlesource.com/c/go/+/329921 Trust: Dan Scales <danscales@google.com> Run-TryBot: Dan Scales <danscales@google.com> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Keith Randall <khr@golang.org>
82 lines
1.6 KiB
Go
82 lines
1.6 KiB
Go
// run -gcflags=-G=3
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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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