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