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133 lines
2.2 KiB
Go
133 lines
2.2 KiB
Go
// $G $D/$F.go && $L $F.$A && ./$A.out
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// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package main
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func setpd(a []int) {
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// print("setpd a=", a, " len=", len(a), " cap=", cap(a), "\n");
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for i := 0; i < len(a); i++ {
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a[i] = i
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}
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}
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func sumpd(a []int) int {
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// print("sumpd a=", a, " len=", len(a), " cap=", cap(a), "\n");
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t := 0
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for i := 0; i < len(a); i++ {
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t += a[i]
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}
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// print("sumpd t=", t, "\n");
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return t
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}
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func setpf(a *[20]int) {
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// print("setpf a=", a, " len=", len(a), " cap=", cap(a), "\n");
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for i := 0; i < len(a); i++ {
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a[i] = i
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}
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}
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func sumpf(a *[20]int) int {
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// print("sumpf a=", a, " len=", len(a), " cap=", cap(a), "\n");
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t := 0
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for i := 0; i < len(a); i++ {
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t += a[i]
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}
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// print("sumpf t=", t, "\n");
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return t
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}
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func res(t int, lb, hb int) {
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sb := (hb - lb) * (hb + lb - 1) / 2
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if t != sb {
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print("lb=", lb,
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"; hb=", hb,
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"; t=", t,
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"; sb=", sb,
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"\n")
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panic("res")
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}
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}
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// call ptr dynamic with ptr dynamic
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func testpdpd() {
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a := make([]int, 10, 100)
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if len(a) != 10 && cap(a) != 100 {
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print("len and cap from new: ", len(a), " ", cap(a), "\n")
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panic("fail")
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}
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a = a[0:100]
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setpd(a)
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a = a[0:10]
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res(sumpd(a), 0, 10)
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a = a[5:25]
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res(sumpd(a), 5, 25)
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}
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// call ptr fixed with ptr fixed
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func testpfpf() {
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var a [20]int
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setpf(&a)
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res(sumpf(&a), 0, 20)
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}
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// call ptr dynamic with ptr fixed from new
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func testpdpf1() {
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a := new([40]int)
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setpd(a[0:])
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res(sumpd(a[0:]), 0, 40)
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b := (*a)[5:30]
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res(sumpd(b), 5, 30)
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}
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// call ptr dynamic with ptr fixed from var
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func testpdpf2() {
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var a [80]int
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setpd(a[0:])
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res(sumpd(a[0:]), 0, 80)
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}
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// generate bounds error with ptr dynamic
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func testpdfault() {
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a := make([]int, 100)
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print("good\n")
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for i := 0; i < 100; i++ {
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a[i] = 0
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}
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print("should fault\n")
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a[100] = 0
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print("bad\n")
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}
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// generate bounds error with ptr fixed
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func testfdfault() {
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var a [80]int
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print("good\n")
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for i := 0; i < 80; i++ {
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a[i] = 0
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}
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print("should fault\n")
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x := 80
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a[x] = 0
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print("bad\n")
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}
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func main() {
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testpdpd()
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testpfpf()
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testpdpf1()
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testpdpf2()
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// print("testpdfault\n"); testpdfault();
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// print("testfdfault\n"); testfdfault();
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}
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