48 lines
1.5 KiB
Go
48 lines
1.5 KiB
Go
package main
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import (
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"fmt"
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"go.wit.com/lib/protobuf/chatpb"
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"google.golang.org/protobuf/proto"
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)
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func main() {
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// 1. Create our source object that we want to copy.
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originalChat := &chatpb.Chat{
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From: chatpb.Who_USER,
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Content: "This is a test message.",
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Uuid: "uuid-original",
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}
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// 2. Create the list we want to append to.
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allChats := &chatpb.Chats{
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Uuid: "main-chat-list",
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}
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fmt.Printf("Before copy, originalChat's content: '%s'\n", originalChat.GetContent())
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fmt.Printf("Initial length of allChats: %d\n\n", len(allChats.GetChats()))
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// 3. Create a deep copy using proto.Clone().
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// The result is a proto.Message, so we must type-assert it back to *chatpb.Chat.
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chatCopy := proto.Clone(originalChat).(*chatpb.Chat)
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// 4. Append the COPY to the list.
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allChats.Chats = append(allChats.GetChats(), chatCopy)
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fmt.Println("--- Appended the copy. Now modifying the original... ---")
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// 5. Now, modify the original object.
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originalChat.Content = "The original message has been changed!"
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originalChat.Uuid = "uuid-modified"
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// 6. Prove that the copy in the list was NOT affected.
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fmt.Printf("\nAfter modification, originalChat's content: '%s'\n", originalChat.GetContent())
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appendedChat := allChats.GetChats()[0]
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fmt.Printf("Appended chat's content: '%s'\n", appendedChat.GetContent())
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fmt.Printf("Appended chat's UUID: '%s'\n", appendedChat.GetUuid())
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fmt.Println("\nSuccess! The appended chat is an independent copy and was not affected by changes to the original.")
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}
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