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Pointer Receiver Code

Methods with pointer receivers don't require that a pointer is used to call the method. The pointer will automatically be derived from the value.

type circle struct {
	x int
	y int
    radius int
}

func (c *circle) grow() {
    c.radius *= 2
}

func main() {
    c := circle{
        x: 1,
        y: 2,
        radius: 4,
    }

    // notice c is not a pointer in the calling function
    // but the method still gains access to a pointer to c
    c.grow()
    fmt.Println(c.radius)
    // prints 8
}

Assignment

Fix the bug in the code so that setMessage sets the message field of the given email struct, and the new value persists outside the scope of the setMessage method.