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https://github.com/golang/go
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cf20540880
The String method is n-squared and overwrites its receiver. Fix both issues, with only a slight loss of clarity. Fixes #28773 Change-Id: I588f69d4cbd72931b28b984671512834473bd466 Reviewed-on: https://go-review.googlesource.com/c/151217 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
50 lines
995 B
Go
50 lines
995 B
Go
// 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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import (
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"fmt"
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"sort"
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)
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func main() {
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seq := Sequence{6, 2, -1, 44, 16}
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sort.Sort(seq)
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fmt.Println(seq)
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}
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type Sequence []int
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// Methods required by sort.Interface.
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func (s Sequence) Len() int {
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return len(s)
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}
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func (s Sequence) Less(i, j int) bool {
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return s[i] < s[j]
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}
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func (s Sequence) Swap(i, j int) {
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s[i], s[j] = s[j], s[i]
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}
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// Copy returns a copy of the Sequence.
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func (s Sequence) Copy() Sequence {
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copy := make(Sequence, 0, len(s))
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return append(copy, s...)
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}
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// Method for printing - sorts the elements before printing.
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func (s Sequence) String() string {
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s = s.Copy() // Make a copy; don't overwrite argument.
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sort.Sort(s)
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str := "["
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for i, elem := range s { // Loop is O(N²); will fix that in next example.
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if i > 0 {
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str += " "
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}
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str += fmt.Sprint(elem)
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}
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return str + "]"
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}
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