mirror of
https://github.com/golang/go
synced 2024-09-18 15:32:18 +00:00
00f9f0c056
note that sortmain.go has been run through hg gofmt; only the formatting of the day initializers changed. i'm happy to revert that formatting if you'd prefer. stop on error in doc/progs/run R=r CC=golang-dev https://golang.org/cl/850041
77 lines
1.5 KiB
Go
77 lines
1.5 KiB
Go
// $G $D/$F.go && $L $F.$A && ./$A.out
|
|
|
|
// Copyright 2009 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 "unsafe"
|
|
|
|
func use(bool) {}
|
|
|
|
func stringptr(s string) uintptr { return *(*uintptr)(unsafe.Pointer(&s)) }
|
|
|
|
func isfalse(b bool) {
|
|
if b {
|
|
// stack will explain where
|
|
panic("wanted false, got true")
|
|
}
|
|
}
|
|
|
|
func istrue(b bool) {
|
|
if !b {
|
|
// stack will explain where
|
|
panic("wanted true, got false")
|
|
}
|
|
}
|
|
|
|
func main() {
|
|
var a []int
|
|
var b map[string]int
|
|
|
|
var c string = "hello"
|
|
var d string = "hel" // try to get different pointer
|
|
d = d + "lo"
|
|
if stringptr(c) == stringptr(d) {
|
|
panic("compiler too smart -- got same string")
|
|
}
|
|
|
|
var e = make(chan int)
|
|
|
|
var ia interface{} = a
|
|
var ib interface{} = b
|
|
var ic interface{} = c
|
|
var id interface{} = d
|
|
var ie interface{} = e
|
|
|
|
// these comparisons are okay because
|
|
// string compare is okay and the others
|
|
// are comparisons where the types differ.
|
|
isfalse(ia == ib)
|
|
isfalse(ia == ic)
|
|
isfalse(ia == id)
|
|
isfalse(ib == ic)
|
|
isfalse(ib == id)
|
|
istrue(ic == id)
|
|
istrue(ie == ie)
|
|
|
|
// 6g used to let this go through as true.
|
|
var g uint64 = 123
|
|
var h int64 = 123
|
|
var ig interface{} = g
|
|
var ih interface{} = h
|
|
isfalse(ig == ih)
|
|
|
|
// map of interface should use == on interface values,
|
|
// not memory.
|
|
// TODO: should m[c], m[d] be valid here?
|
|
var m = make(map[interface{}]int)
|
|
m[ic] = 1
|
|
m[id] = 2
|
|
if m[ic] != 2 {
|
|
println("m[ic] = ", m[ic])
|
|
panic("bad m[ic]")
|
|
}
|
|
}
|