Now, to modify a map element, especially the element type is not a basic
type, two hashes are needed to compute. This is often unnecessary and
inefficient. For example:
package main
type T struct{
N int
// ... more fields
}
func main() {
var m = map[string]T{}
m["foo"] = T{N: 0}
// modify
t := m["foo"] // first hashing
t.N++
m["foo"] = t // second hashing
}
Will it be good to add a new builtin function, modify(m Map[Key]Value, k
Key, func(v *Value)), to modify map elements with only one hash? A use
example:
package main
type T struct{
N int
// ... more fields
}
func main() {
var m = map[string]T{}
m["foo"] = T{N: 0}
// modify
modify(m. "foo", func(t *T) {
t.N++
})
}
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