mirror of
https://github.com/golang/go
synced 2024-11-24 08:50:14 -07:00
196b663075
To allow these types as map keys, we must fill in equal and hash functions in their algorithm tables. Structs or arrays that are "just memory", like [2]int, can and do continue to use the AMEM algorithm. Structs or arrays that contain special values like strings or interface values use generated functions for both equal and hash. The runtime helper func runtime.equal(t, x, y) bool handles the general equality case for x == y and calls out to the equal implementation in the algorithm table. For short values (<= 4 struct fields or array elements), the sequence of elementwise comparisons is inlined instead of calling runtime.equal. R=ken, mpimenov CC=golang-dev https://golang.org/cl/5451105
86 lines
1.2 KiB
Go
86 lines
1.2 KiB
Go
// $G $D/$F.go && $L $F.$A && ./$A.out
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// Copyright 2010 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 of recover for run-time errors.
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// TODO(rsc):
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// null pointer accesses
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package main
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import "strings"
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var x = make([]byte, 10)
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func main() {
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test1()
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test2()
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test3()
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test4()
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test5()
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test6()
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test7()
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}
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func mustRecover(s string) {
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v := recover()
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if v == nil {
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panic("expected panic")
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}
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if e := v.(error).Error(); strings.Index(e, s) < 0 {
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panic("want: " + s + "; have: " + e)
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}
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}
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func test1() {
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defer mustRecover("index")
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println(x[123])
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}
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func test2() {
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defer mustRecover("slice")
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println(x[5:15])
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}
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func test3() {
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defer mustRecover("slice")
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var lo = 11
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var hi = 9
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println(x[lo:hi])
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}
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func test4() {
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defer mustRecover("interface")
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var x interface{} = 1
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println(x.(float32))
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}
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type T struct {
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a, b int
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c []int
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}
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func test5() {
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defer mustRecover("uncomparable")
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var x T
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var z interface{} = x
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println(z != z)
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}
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func test6() {
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defer mustRecover("unhashable")
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var x T
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var z interface{} = x
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m := make(map[interface{}]int)
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m[z] = 1
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}
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func test7() {
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defer mustRecover("divide by zero")
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var x, y int
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println(x / y)
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}
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