Generic type constraint match reflect.Type passed [closed]

Question

Could you please help to mercy golang compiler in the following example. I'd like to implement generalized string parser

func Value[T reflect.Type](value string, t reflect.Type) T {
    switch t.Kind() {
    case reflect.Int8:
        parsed, _ := strconv.ParseInt(value, 10, 8)
        return int8(parsed)
    case reflect.Int16:
        parsed, _ := strconv.ParseInt(value, 10, 16)
        return int16(parsed)
    default:
        panic(fmt.Sprintf("%s conversion is not supported", t))
    }
}

And that supposed to be used as

var int8Value int8 = Value("5", reflect.Int8)

Answer 1

A simple solution to this would be:

func Value[T constraints.Integer](value string) (T,error) {
    parsed, err := strconv.ParseInt(value, 10, 64)
        if err!=nil {
          // handle error
        }
        // Range check?
        if int64(T(parsed))!=parsed {
          // Overflow
        }
    return T(parsed),nil
}

Then you can use It as Value[int8]("123").