| // compile | |
| // Copyright 2023 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 main | |
| import ( | |
| "fmt" | |
| "reflect" | |
| "unsafe" | |
| ) | |
| var slice = []byte{'H', 'e', 'l', 'l', 'o', ','} | |
| func main() { | |
| ptr := uintptr(unsafe.Pointer(&slice)) + 100 | |
| header := (*reflect.SliceHeader)(unsafe.Pointer(ptr)) | |
| header.Data += 1 | |
| fmt.Printf("%d %d\n", cap(slice), header.Cap) | |
| } |