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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 proto
import (
"fmt"
"google.golang.org/protobuf/reflect/protoreflect"
)
// Reset clears every field in the message.
// The resulting message shares no observable memory with its previous state
// other than the memory for the message itself.
func Reset(m Message) {
if mr, ok := m.(interface{ Reset() }); ok && hasProtoMethods {
mr.Reset()
return
}
resetMessage(m.ProtoReflect())
}
func resetMessage(m protoreflect.Message) {
if !m.IsValid() {
panic(fmt.Sprintf("cannot reset invalid %v message", m.Descriptor().FullName()))
}
// Clear all known fields.
fds := m.Descriptor().Fields()
for i := 0; i < fds.Len(); i++ {
m.Clear(fds.Get(i))
}
// Clear extension fields.
m.Range(func(fd protoreflect.FieldDescriptor, _ protoreflect.Value) bool {
m.Clear(fd)
return true
})
// Clear unknown fields.
m.SetUnknown(nil)
}
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