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clone.go
// 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 unsafe.String(&b[0], len(b)) }
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