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56 lines
2.0 KiB
56 lines
2.0 KiB
// Copyright 2019 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package protoimpl
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import (
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"google.golang.org/protobuf/internal/version"
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)
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const (
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// MaxVersion is the maximum supported version for generated .pb.go files.
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// It is always the current version of the module.
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MaxVersion = version.Minor
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// GenVersion is the runtime version required by generated .pb.go files.
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// This is incremented when generated code relies on new functionality
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// in the runtime.
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GenVersion = 20
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// MinVersion is the minimum supported version for generated .pb.go files.
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// This is incremented when the runtime drops support for old code.
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MinVersion = 0
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)
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// EnforceVersion is used by code generated by protoc-gen-go
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// to statically enforce minimum and maximum versions of this package.
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// A compilation failure implies either that:
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// * the runtime package is too old and needs to be updated OR
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// * the generated code is too old and needs to be regenerated.
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//
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// The runtime package can be upgraded by running:
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// go get google.golang.org/protobuf
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//
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// The generated code can be regenerated by running:
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// protoc --go_out=${PROTOC_GEN_GO_ARGS} ${PROTO_FILES}
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//
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// Example usage by generated code:
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// const (
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// // Verify that this generated code is sufficiently up-to-date.
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// _ = protoimpl.EnforceVersion(genVersion - protoimpl.MinVersion)
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// // Verify that runtime/protoimpl is sufficiently up-to-date.
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// _ = protoimpl.EnforceVersion(protoimpl.MaxVersion - genVersion)
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// )
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//
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// The genVersion is the current minor version used to generated the code.
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// This compile-time check relies on negative integer overflow of a uint
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// being a compilation failure (guaranteed by the Go specification).
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type EnforceVersion uint
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// This enforces the following invariant:
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// MinVersion ≤ GenVersion ≤ MaxVersion
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const (
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_ = EnforceVersion(GenVersion - MinVersion)
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_ = EnforceVersion(MaxVersion - GenVersion)
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)
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