| 1 | // Copyright 2014 The Go Authors. All rights reserved. |
|---|---|
| 2 | // Use of this source code is governed by a BSD-style |
| 3 | // license that can be found in the LICENSE file. |
| 4 | |
| 5 | // Signed integers spanning zero. |
| 6 | |
| 7 | package main |
| 8 | |
| 9 | import "fmt" |
| 10 | |
| 11 | type Num int |
| 12 | |
| 13 | const ( |
| 14 | m_2 Num = -2 + iota |
| 15 | m_1 |
| 16 | m0 |
| 17 | m1 |
| 18 | m2 |
| 19 | ) |
| 20 | |
| 21 | func main() { |
| 22 | ck(-3, "Num(-3)") |
| 23 | ck(m_2, "m_2") |
| 24 | ck(m_1, "m_1") |
| 25 | ck(m0, "m0") |
| 26 | ck(m1, "m1") |
| 27 | ck(m2, "m2") |
| 28 | ck(3, "Num(3)") |
| 29 | } |
| 30 | |
| 31 | func ck(num Num, str string) { |
| 32 | if fmt.Sprint(num) != str { |
| 33 | panic("num.go: " + str) |
| 34 | } |
| 35 | } |
| 36 |