| Dan Willemsen | bc60c3c | 2021-12-15 01:09:00 -0800 | [diff] [blame] | 1 | // Copyright 2021 The Go Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style |
| 3 | // license that can be found in the LICENSE file. |
| 4 | |
| 5 | package strings |
| 6 | |
| 7 | import ( |
| 8 | "unsafe" |
| 9 | ) |
| 10 | |
| 11 | // Clone returns a fresh copy of s. |
| 12 | // It guarantees to make a copy of s into a new allocation, |
| 13 | // which can be important when retaining only a small substring |
| 14 | // of a much larger string. Using Clone can help such programs |
| 15 | // use less memory. Of course, since using Clone makes a copy, |
| 16 | // overuse of Clone can make programs use more memory. |
| 17 | // Clone should typically be used only rarely, and only when |
| 18 | // profiling indicates that it is needed. |
| 19 | // For strings of length zero the string "" will be returned |
| 20 | // and no allocation is made. |
| 21 | func Clone(s string) string { |
| 22 | if len(s) == 0 { |
| 23 | return "" |
| 24 | } |
| 25 | b := make([]byte, len(s)) |
| 26 | copy(b, s) |
| 27 | return *(*string)(unsafe.Pointer(&b)) |
| 28 | } |