| // run -gcflags=-G=3 |
| |
| // 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 main |
| |
| import "io" |
| |
| type Reader struct { |
| buf []byte |
| } |
| type Token *[16]byte |
| |
| func Read[T interface{ ~*[16]byte }](r *Reader) (t T, err error) { |
| if n := len(t); len(r.buf) >= n { |
| t = T(r.buf[:n]) |
| r.buf = r.buf[n:] |
| return |
| } |
| err = io.EOF |
| return |
| } |
| |
| func main() { |
| r := &Reader{buf: []byte("0123456789abcdef")} |
| token, err := Read[Token](r) |
| _, _ = token, err |
| } |
