mirror of
https://github.com/golang/go
synced 2024-11-18 14:34:39 -07:00
fb273fc3a3
Passes toolstash -cmp. Fixes #16870. Change-Id: I70dc3bbb3cd3031826e5a54b96ba1ea603c282d1 Reviewed-on: https://go-review.googlesource.com/27910 Run-TryBot: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
141 lines
1.7 KiB
Go
141 lines
1.7 KiB
Go
// run
|
|
|
|
// Copyright 2016 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 (
|
|
"log"
|
|
"reflect"
|
|
)
|
|
|
|
func test(got, want interface{}) {
|
|
if !reflect.DeepEqual(got, want) {
|
|
log.Fatalf("got %v, want %v", got, want)
|
|
}
|
|
}
|
|
|
|
func main() {
|
|
var i int
|
|
var ip *int
|
|
var ok interface{}
|
|
|
|
// Channel receives.
|
|
c := make(chan int, 1)
|
|
c2 := make(chan int)
|
|
|
|
c <- 42
|
|
i, ok = <-c
|
|
test(i, 42)
|
|
test(ok, true)
|
|
|
|
c <- 42
|
|
_, ok = <-c
|
|
test(ok, true)
|
|
|
|
c <- 42
|
|
select {
|
|
case i, ok = <-c:
|
|
test(i, 42)
|
|
test(ok, true)
|
|
}
|
|
|
|
c <- 42
|
|
select {
|
|
case _, ok = <-c:
|
|
test(ok, true)
|
|
}
|
|
|
|
c <- 42
|
|
select {
|
|
case i, ok = <-c:
|
|
test(i, 42)
|
|
test(ok, true)
|
|
default:
|
|
log.Fatal("bad select")
|
|
}
|
|
|
|
c <- 42
|
|
select {
|
|
case _, ok = <-c:
|
|
test(ok, true)
|
|
default:
|
|
log.Fatal("bad select")
|
|
}
|
|
|
|
c <- 42
|
|
select {
|
|
case i, ok = <-c:
|
|
test(i, 42)
|
|
test(ok, true)
|
|
case <-c2:
|
|
log.Fatal("bad select")
|
|
}
|
|
|
|
c <- 42
|
|
select {
|
|
case _, ok = <-c:
|
|
test(ok, true)
|
|
case <-c2:
|
|
log.Fatal("bad select")
|
|
}
|
|
|
|
close(c)
|
|
i, ok = <-c
|
|
test(i, 0)
|
|
test(ok, false)
|
|
|
|
_, ok = <-c
|
|
test(ok, false)
|
|
|
|
// Map indexing.
|
|
m := make(map[int]int)
|
|
|
|
i, ok = m[0]
|
|
test(i, 0)
|
|
test(ok, false)
|
|
|
|
_, ok = m[0]
|
|
test(ok, false)
|
|
|
|
m[0] = 42
|
|
i, ok = m[0]
|
|
test(i, 42)
|
|
test(ok, true)
|
|
|
|
_, ok = m[0]
|
|
test(ok, true)
|
|
|
|
// Type assertions.
|
|
var u interface{}
|
|
|
|
i, ok = u.(int)
|
|
test(i, 0)
|
|
test(ok, false)
|
|
|
|
ip, ok = u.(*int)
|
|
test(ip, (*int)(nil))
|
|
test(ok, false)
|
|
|
|
_, ok = u.(int)
|
|
test(ok, false)
|
|
|
|
u = 42
|
|
i, ok = u.(int)
|
|
test(i, 42)
|
|
test(ok, true)
|
|
|
|
_, ok = u.(int)
|
|
test(ok, true)
|
|
|
|
u = &i
|
|
ip, ok = u.(*int)
|
|
test(ip, &i)
|
|
test(ok, true)
|
|
|
|
_, ok = u.(*int)
|
|
test(ok, true)
|
|
}
|