| // Copyright 2018 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.md file. |
| |
| // Package pragma provides types that can be embedded into a struct to |
| // statically enforce or prevent certain language properties. |
| package pragma |
| |
| import "sync" |
| |
| // NoUnkeyedLiterals can be embedded in a struct to prevent unkeyed literals. |
| type NoUnkeyedLiterals struct{} |
| |
| // DoNotImplement can be embedded in an interface to prevent trivial |
| // implementations of the interface. |
| // |
| // This is useful to prevent unauthorized implementations of an interface |
| // so that it can be extended in the future for any protobuf language changes. |
| type DoNotImplement interface{ ProtoInternal(DoNotImplement) } |
| |
| // DoNotCompare can be embedded in a struct to prevent comparability. |
| type DoNotCompare [0]func() |
| |
| // DoNotCopy can be embedded in a struct to help prevent shallow copies. |
| // This does not rely on a Go language feature, but rather a special case |
| // within the vet checker. |
| // |
| // See https://golang.org/issues/8005. |
| type DoNotCopy [0]sync.Mutex |
