// 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 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)

)