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- // Copyright 2021 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.
- package strings
- import (
- "unsafe"
- )
- // Clone returns a fresh copy of s.
- // It guarantees to make a copy of s into a new allocation,
- // which can be important when retaining only a small substring
- // of a much larger string. Using Clone can help such programs
- // use less memory. Of course, since using Clone makes a copy,
- // overuse of Clone can make programs use more memory.
- // Clone should typically be used only rarely, and only when
- // profiling indicates that it is needed.
- // For strings of length zero the string "" will be returned
- // and no allocation is made.
- func Clone(s string) string {
- if len(s) == 0 {
- return ""
- }
- b := make([]byte, len(s))
- copy(b, s)
- return *(*string)(unsafe.Pointer(&b))
- }
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