go/test/typeparam/index.go
Dan Scales ccbfbb1c33 [dev.typeparams] cmd/compile: export OFUNCINST and OSELRECV2 nodes (for generic functions)
Added new test typeparam/factimp.go and changed a bunch of other tests
to test exporting more generic functions and types.

Change-Id: I573d75431cc92482f8f908695cfbc8e84dbb36d2
Reviewed-on: https://go-review.googlesource.com/c/go/+/321749
Trust: Dan Scales <danscales@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
2021-05-21 17:03:30 +00:00

46 lines
941 B
Go

// run -gcflags=-G=3
// Copyright 2021 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.
package main
import (
"fmt"
)
// Index returns the index of x in s, or -1 if not found.
func Index[T comparable](s []T, x T) int {
for i, v := range s {
// v and x are type T, which has the comparable
// constraint, so we can use == here.
if v == x {
return i
}
}
return -1
}
type obj struct {
x int
}
func main() {
want := 2
vec1 := []string{"ab", "cd", "ef"}
if got := Index(vec1, "ef"); got != want {
panic(fmt.Sprintf("got %d, want %d", got, want))
}
vec2 := []byte{'c', '6', '@'}
if got := Index(vec2, '@'); got != want {
panic(fmt.Sprintf("got %d, want %d", got, want))
}
vec3 := []*obj{&obj{2}, &obj{42}, &obj{1}}
if got := Index(vec3, vec3[2]); got != want {
panic(fmt.Sprintf("got %d, want %d", got, want))
}
}