Working Demo

1.Make a temporary folder for this demo

 $ mkdir temp

2.Install the msgp processor

 $ go install github.com/tinylib/msgp@latest

3.Open editor and copy/paste and save the code below:

 package main

 import (
     "fmt"
 )

 //go:generate msgp

 type QryD struct {
         A int8 
         D int8 
         T string 
         K string 
         V string 
 }

 func main() {
     fmt.Println("Nothing to see here yet!")
 }

4.Run the following command: (this is important as it generates a "template" for your msgp variables defined above)

 $ go generate

5.Two more files are generated here, main_gen.go and main_gen_test.go , verify by typing

 $ ls -al

6.Replace all content of main.go by copy pasting these lines:

	package main

	import (
		"fmt"

	)

	//go:generate msgp

	type QryD struct {
		A int8 
		D int8 
		T string 
		K string 
		V string 
	}



	func main() {
		var valuePlaceholder QryD

		v := QryD{A: 1, D: 9, T: "table", K: "key", V: "value"}
		bts, err := v.MarshalMsg(nil)
		if err != nil {
			// fmt.Println(err) // print err or log error information
		}
		leftovervalues, err := valuePlaceholder.UnmarshalMsg(bts) // purpose of lefovervalues, pls read doc.
		fmt.Println(leftovervalues)
		// leftovervalues is empty because bts only contained one object.

		fmt.Println(valuePlaceholder)
		fmt.Println(valuePlaceholder.A)
		fmt.Println(valuePlaceholder.D)
		fmt.Println(valuePlaceholder.T)
		fmt.Println(valuePlaceholder.K)
		fmt.Println(valuePlaceholder.V)

		if err != nil {
			fmt.Printf("error: %s\n", err)
		}
	}

7.Run the following lines to generate "main" executable:

 $ go build main.go main_gen.go

8.Run the program

  $ ./main

9.You should see

	[]
	{1 9 table key value}
	1
	9
	table
	key
	value
	Nothing to see here yet!

10.That's it!