pragma.go (1105B)
1 // Copyright 2018 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 // Package pragma provides types that can be embedded into a struct to 6 // statically enforce or prevent certain language properties. 7 package pragma 8 9 import "sync" 10 11 // NoUnkeyedLiterals can be embedded in a struct to prevent unkeyed literals. 12 type NoUnkeyedLiterals struct{} 13 14 // DoNotImplement can be embedded in an interface to prevent trivial 15 // implementations of the interface. 16 // 17 // This is useful to prevent unauthorized implementations of an interface 18 // so that it can be extended in the future for any protobuf language changes. 19 type DoNotImplement interface{ ProtoInternal(DoNotImplement) } 20 21 // DoNotCompare can be embedded in a struct to prevent comparability. 22 type DoNotCompare [0]func() 23 24 // DoNotCopy can be embedded in a struct to help prevent shallow copies. 25 // This does not rely on a Go language feature, but rather a special case 26 // within the vet checker. 27 // 28 // See https://golang.org/issues/8005. 29 type DoNotCopy [0]sync.Mutex