I cannot figure out how to initialize structure field when it is a reference type alias of the one of the number types:
package main
import (
"fmt"
"encoding/json"
)
type Nint64 *int64
type MyStruct struct {
Value Nint64
}
func main() {
data, _ := json.Marshal(&MyStruct{ Value : ?? 10 ?? })
fmt.Println(string(data))
}
You can't, you will have to add an extra step playground:
func NewMyStruct(i int64) *MyStruct {
return &MyStruct{&i}
}
func main() {
i := int64(10)
data, _ := json.Marshal(&MyStruct{Value: Nint64(&i)})
fmt.Println(string(data))
//or this
data, _ = json.Marshal(NewMyStruct(20))
fmt.Println(string(data))
}
&i instead of Nint64(&i)? It is considered safe?I don't think you want to reference to the address of an int64 ...
package main
import (
"encoding/json"
"fmt"
)
type Nint64 int64
type MyStruct struct {
Value Nint64
}
func main() {
data, _ := json.Marshal(&MyStruct{Value: Nint64(10)})
fmt.Println(string(data))
}
{value:null} or {value:10} - your answer changes semantic of the code as makes {value:null} impossible