1*1c12ee1eSDan Willemsen// Copyright 2018 The Go Authors. All rights reserved. 2*1c12ee1eSDan Willemsen// Use of this source code is governed by a BSD-style 3*1c12ee1eSDan Willemsen// license that can be found in the LICENSE file. 4*1c12ee1eSDan Willemsen 5*1c12ee1eSDan Willemsen// Package pragma provides types that can be embedded into a struct to 6*1c12ee1eSDan Willemsen// statically enforce or prevent certain language properties. 7*1c12ee1eSDan Willemsenpackage pragma 8*1c12ee1eSDan Willemsen 9*1c12ee1eSDan Willemsenimport "sync" 10*1c12ee1eSDan Willemsen 11*1c12ee1eSDan Willemsen// NoUnkeyedLiterals can be embedded in a struct to prevent unkeyed literals. 12*1c12ee1eSDan Willemsentype NoUnkeyedLiterals struct{} 13*1c12ee1eSDan Willemsen 14*1c12ee1eSDan Willemsen// DoNotImplement can be embedded in an interface to prevent trivial 15*1c12ee1eSDan Willemsen// implementations of the interface. 16*1c12ee1eSDan Willemsen// 17*1c12ee1eSDan Willemsen// This is useful to prevent unauthorized implementations of an interface 18*1c12ee1eSDan Willemsen// so that it can be extended in the future for any protobuf language changes. 19*1c12ee1eSDan Willemsentype DoNotImplement interface{ ProtoInternal(DoNotImplement) } 20*1c12ee1eSDan Willemsen 21*1c12ee1eSDan Willemsen// DoNotCompare can be embedded in a struct to prevent comparability. 22*1c12ee1eSDan Willemsentype DoNotCompare [0]func() 23*1c12ee1eSDan Willemsen 24*1c12ee1eSDan Willemsen// DoNotCopy can be embedded in a struct to help prevent shallow copies. 25*1c12ee1eSDan Willemsen// This does not rely on a Go language feature, but rather a special case 26*1c12ee1eSDan Willemsen// within the vet checker. 27*1c12ee1eSDan Willemsen// 28*1c12ee1eSDan Willemsen// See https://golang.org/issues/8005. 29*1c12ee1eSDan Willemsentype DoNotCopy [0]sync.Mutex 30