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Does Passing "this" by Value Degrade Performance in Go Methods?
Unlike C where value-passed function arguments can result in significant performance penalties due to variable copying, Go's method receivers follow a different paradigm.
In Go, method receivers are mere syntactic conveniences. As demonstrated below:
type Something struct { Value int } func (s *Something) ChangeValue(n int) { s.Value = n } func main() { o := new(Something) fmt.Println(o.Value) // Prints 0 o.ChangeValue(8) // Changes o's value to 8 fmt.Println(o.Value) // Prints 8 (*Something).ChangeValue(o, 16) // Same as calling o.ChangeValue(16) fmt.Println(o.Value) // Prints 16 }
Notice that the receiver s in ChangeValue is a pointer, making it similar to a reference in C . If the receiver were a value type, it wouldn't allow value mutation.
Therefore, Go's pointer receiver approach ensures encapsulation and prevents copying of the entire "this" instance, unlike the performance penalty observed in C/C for passing arguments by value.
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