1. 1
2. 2
3. 3
4. 4
5. 5
6. 6
7. 7
8. 8
9. 9
10. 10
11. 11
12. 12
13. 13
14. 14
15. 15
16. 16
17. 17
18. 18
19. 19
20. 20
21. 21
22. 22
23. 23
24. 24
25. 25
26. 26
27. 27
28. 28
29. 29
30. 30
31. 31
32. 32
33. 33
34. 34
35. 35
36. 36
37. 37
38. 38
39. 39
40. 40
41. 41
42. 42
43. 43
44. 44
45. 45
46. 46
47. 47
48. 48
49. 49
50. 50
51. 51
52. 52
53. 53
54. 54
55. 55
56. 56

// Copyright 2019 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 protoimpl

import (
	"google.golang.org/protobuf/internal/version"
)

const (
	// MaxVersion is the maximum supported version for generated .pb.go files.
	// It is always the current version of the module.
	MaxVersion = version.Minor

	// GenVersion is the runtime version required by generated .pb.go files.
	// This is incremented when generated code relies on new functionality
	// in the runtime.
	GenVersion = 20

	// MinVersion is the minimum supported version for generated .pb.go files.
	// This is incremented when the runtime drops support for old code.
	MinVersion = 0
)

// EnforceVersion is used by code generated by protoc-gen-go
// to statically enforce minimum and maximum versions of this package.
// A compilation failure implies either that:
//	* the runtime package is too old and needs to be updated OR
//	* the generated code is too old and needs to be regenerated.
//
// The runtime package can be upgraded by running:
//	go get google.golang.org/protobuf
//
// The generated code can be regenerated by running:
//	protoc --go_out=${PROTOC_GEN_GO_ARGS} ${PROTO_FILES}
//
// Example usage by generated code:
//	const (
//		// Verify that this generated code is sufficiently up-to-date.
//		_ = protoimpl.EnforceVersion(genVersion - protoimpl.MinVersion)
//		// Verify that runtime/protoimpl is sufficiently up-to-date.
//		_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - genVersion)
//	)
//
// The genVersion is the current minor version used to generated the code.
// This compile-time check relies on negative integer overflow of a uint
// being a compilation failure (guaranteed by the Go specification).
type EnforceVersion uint

// This enforces the following invariant:
//	MinVersion ≤ GenVersion ≤ MaxVersion
const (
	_ = EnforceVersion(GenVersion - MinVersion)
	_ = EnforceVersion(MaxVersion - GenVersion)
)