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22 lines
709 B
Go
22 lines
709 B
Go
package utils
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import "unsafe"
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// ImmutableBytesFromString is equivalent to []byte(s), except that it uses the
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// same memory backing s instead of making a heap-allocated copy. This is only
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// valid if the returned slice is never mutated.
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func ImmutableBytesFromString(s string) []byte {
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b := unsafe.StringData(s)
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return unsafe.Slice(b, len(s))
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}
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// StringFromImmutableBytes is equivalent to string(bs), except that it uses
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// the same memory backing bs instead of making a heap-allocated copy. This is
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// only valid if bs is never mutated after StringFromImmutableBytes returns.
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func StringFromImmutableBytes(bs []byte) string {
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if len(bs) == 0 {
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return ""
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}
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return unsafe.String(&bs[0], len(bs))
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}
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