Newbie question

[Daniel Jankins]

Hi,

Why can you update a value in a map struct?

 // UnaddressableFieldAssign occurs when trying to assign to a struct field

	// in a map value.
	//
	// Example:
	//  func f() {
	//  	m := make(map[string]struct{i int})
	//  	m["foo"].i = 42
	//  }

I am reading a yaml file and want to change some values in the struct.

Thank s

--

DanJ

[wagner riffel]

On 1/10/23 11:42, Daniel Jankins wrote:
> Hi,
>
> Why can you update a value in a map struct?
>

Sort answer, because m["foo"] is not addressable, but you can have the
desired behavior using a temp variable:

func f() {

m := make(map[string]struct{ i int })

x := m["foo"]
x.i = 42
m["foo"] = x
}

BR.
-- w

[Daniel Jankins]

Thanks!