8dc2499aa6
gotools/ * Makefile.am (go_cmd_cgo_files): Add ast_go118.go (check-go-tool): Copy golang.org/x/tools directories. * Makefile.in: Regenerate. Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/384695
28 lines
877 B
Go
28 lines
877 B
Go
// Copyright 2021 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 strings
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import (
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"unsafe"
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)
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// Clone returns a fresh copy of s.
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// It guarantees to make a copy of s into a new allocation,
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// which can be important when retaining only a small substring
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// of a much larger string. Using Clone can help such programs
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// use less memory. Of course, since using Clone makes a copy,
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// overuse of Clone can make programs use more memory.
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// Clone should typically be used only rarely, and only when
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// profiling indicates that it is needed.
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// For strings of length zero the string "" will be returned
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// and no allocation is made.
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func Clone(s string) string {
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if len(s) == 0 {
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return ""
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}
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b := make([]byte, len(s))
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copy(b, s)
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return *(*string)(unsafe.Pointer(&b))
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}
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