41 lines
1.2 KiB
Go
41 lines
1.2 KiB
Go
// Copyright 2015 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package hack
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import (
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"reflect"
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"unsafe"
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)
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// MutableString can be used as string via string(MutableString) without performance loss.
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type MutableString string
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// String converts slice to MutableString without copy.
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// The MutableString can be converts to string without copy.
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// Use it at your own risk.
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func String(b []byte) MutableString {
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return *(*MutableString)(unsafe.Pointer(&b))
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}
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// Slice converts string to slice without copy.
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// Use at your own risk.
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func Slice(s string) (b []byte) {
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pbytes := (*reflect.SliceHeader)(unsafe.Pointer(&b))
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pstring := *(*reflect.StringHeader)(unsafe.Pointer(&s))
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pbytes.Data = pstring.Data
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pbytes.Len = pstring.Len
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pbytes.Cap = pstring.Len
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return
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}
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