Can not assign to pair in a map

Question

I have the following pair defined in my go program

type pair struct {
  a float64
  b float64
}

Then I create a map:

dictio         


        

Answer 1

That's not legal for reasons described here:

Querying a map give a copy of the stored item, so there is no point assigning to it.

The recommended workaround is:

var xxoo = dictionary["xxoo"]
xxoo.b = 5.0
dictionary["xxoo"] = xxoo