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// 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)
)
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