mirror of
https://github.com/golang/go
synced 2024-11-23 05:40:04 -07:00
88 lines
1.4 KiB
Go
88 lines
1.4 KiB
Go
// run
|
|
|
|
// 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.
|
|
|
|
// Test various safe uses of indirection.
|
|
|
|
package main
|
|
|
|
var m0 map[string]int
|
|
var m1 *map[string]int
|
|
var m2 *map[string]int = &m0
|
|
var m3 map[string]int = map[string]int{"a": 1}
|
|
var m4 *map[string]int = &m3
|
|
|
|
var s0 string
|
|
var s1 *string
|
|
var s2 *string = &s0
|
|
var s3 string = "a"
|
|
var s4 *string = &s3
|
|
|
|
var a0 [10]int
|
|
var a1 *[10]int
|
|
var a2 *[10]int = &a0
|
|
|
|
var b0 []int
|
|
var b1 *[]int
|
|
var b2 *[]int = &b0
|
|
var b3 []int = []int{1, 2, 3}
|
|
var b4 *[]int = &b3
|
|
|
|
func crash() {
|
|
// these uses of nil pointers
|
|
// would crash but should type check
|
|
println("crash",
|
|
len(a1)+cap(a1))
|
|
}
|
|
|
|
func nocrash() {
|
|
// this is spaced funny so that
|
|
// the compiler will print a different
|
|
// line number for each len call if
|
|
// it decides there are type errors.
|
|
// it might also help in the traceback.
|
|
x :=
|
|
len(m0) +
|
|
len(m3)
|
|
if x != 1 {
|
|
println("wrong maplen")
|
|
panic("fail")
|
|
}
|
|
|
|
x =
|
|
len(s0) +
|
|
len(s3)
|
|
if x != 1 {
|
|
println("wrong stringlen")
|
|
panic("fail")
|
|
}
|
|
|
|
x =
|
|
len(a0) +
|
|
len(a2)
|
|
if x != 20 {
|
|
println("wrong arraylen")
|
|
panic("fail")
|
|
}
|
|
|
|
x =
|
|
len(b0) +
|
|
len(b3)
|
|
if x != 3 {
|
|
println("wrong slicelen")
|
|
panic("fail")
|
|
}
|
|
|
|
x =
|
|
cap(b0) +
|
|
cap(b3)
|
|
if x != 3 {
|
|
println("wrong slicecap")
|
|
panic("fail")
|
|
}
|
|
}
|
|
|
|
func main() { nocrash() }
|