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https://github.com/golang/go
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d4e0e8e4a4
Pointers to arrays can be used to cast from a slice. We need the shape of such type params to be different so we can compile those casts correctly. This is kind of a big hammer to fix #49295. It would be nice to only do this when we know there's a []T->*[N]T conversion. Fixes #49295 Change-Id: Ibda33057fab2dd28162537aab0f1244211d68e3f Reviewed-on: https://go-review.googlesource.com/c/go/+/361135 Trust: Keith Randall <khr@golang.org> Trust: Dan Scales <danscales@google.com> Run-TryBot: Keith Randall <khr@golang.org> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Dan Scales <danscales@google.com>
31 lines
556 B
Go
31 lines
556 B
Go
// run -gcflags=-G=3
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// 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 main
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import "io"
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type Reader struct {
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buf []byte
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}
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type Token *[16]byte
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func Read[T interface{ ~*[16]byte }](r *Reader) (t T, err error) {
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if n := len(t); len(r.buf) >= n {
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t = T(r.buf[:n])
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r.buf = r.buf[n:]
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return
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}
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err = io.EOF
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return
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}
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func main() {
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r := &Reader{buf: []byte("0123456789abcdef")}
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token, err := Read[Token](r)
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_, _ = token, err
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}
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