go array 源码
golang array 代码
文件路径：/test/ken/array.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 arrays and slices.
package main
func setpd(a []int) {
// print("setpd a=", a, " len=", len(a), " cap=", cap(a), "\n");
for i := 0; i < len(a); i++ {
a[i] = i
}
}
func sumpd(a []int) int {
// print("sumpd a=", a, " len=", len(a), " cap=", cap(a), "\n");
t := 0
for i := 0; i < len(a); i++ {
t += a[i]
}
// print("sumpd t=", t, "\n");
return t
}
func setpf(a *[20]int) {
// print("setpf a=", a, " len=", len(a), " cap=", cap(a), "\n");
for i := 0; i < len(a); i++ {
a[i] = i
}
}
func sumpf(a *[20]int) int {
// print("sumpf a=", a, " len=", len(a), " cap=", cap(a), "\n");
t := 0
for i := 0; i < len(a); i++ {
t += a[i]
}
// print("sumpf t=", t, "\n");
return t
}
func res(t int, lb, hb int) {
sb := (hb - lb) * (hb + lb - 1) / 2
if t != sb {
print("lb=", lb,
"; hb=", hb,
"; t=", t,
"; sb=", sb,
"\n")
panic("res")
}
}
// call ptr dynamic with ptr dynamic
func testpdpd() {
a := make([]int, 10, 100)
if len(a) != 10 && cap(a) != 100 {
print("len and cap from new: ", len(a), " ", cap(a), "\n")
panic("fail")
}
a = a[0:100]
setpd(a)
a = a[0:10]
res(sumpd(a), 0, 10)
a = a[5:25]
res(sumpd(a), 5, 25)
a = a[30:95]
res(sumpd(a), 35, 100)
}
// call ptr fixed with ptr fixed
func testpfpf() {
var a [20]int
setpf(&a)
res(sumpf(&a), 0, 20)
}
// call ptr dynamic with ptr fixed from new
func testpdpf1() {
a := new([40]int)
setpd(a[0:])
res(sumpd(a[0:]), 0, 40)
b := (*a)[5:30]
res(sumpd(b), 5, 30)
}
// call ptr dynamic with ptr fixed from var
func testpdpf2() {
var a [80]int
setpd(a[0:])
res(sumpd(a[0:]), 0, 80)
}
// generate bounds error with ptr dynamic
func testpdfault() {
a := make([]int, 100)
print("good\n")
for i := 0; i < 100; i++ {
a[i] = 0
}
print("should fault\n")
a[100] = 0
print("bad\n")
}
// generate bounds error with ptr fixed
func testfdfault() {
var a [80]int
print("good\n")
for i := 0; i < 80; i++ {
a[i] = 0
}
print("should fault\n")
x := 80
a[x] = 0
print("bad\n")
}
func main() {
testpdpd()
testpfpf()
testpdpf1()
testpdpf2()
// print("testpdfault\n"); testpdfault();
// print("testfdfault\n"); testfdfault();
}
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