On Wed, Nov 30, 2022 at 10:17 AM 'Mark' via golang-nuts <
golang-nuts@googlegroups.com> wrote:
> Yes, I'd already tried that (that's what I started with) and unfortunately
> it doesn't work.
>
It fails if field.Elem() is nil. Try this:
kind = field.Type().Elem().Kind()
>
> On Wednesday, November 30, 2022 at 3:37:47 PM UTC bse...@computer.org
> wrote:
>
>> On Wed, Nov 30, 2022 at 5:29 AM 'Mark' via golang-nuts <
>> golan...@googlegroups.com> wrote:
>>
>>> I have this code which works but has a horrible hack:
>>> ...
>>> nullable := false
>>> kind := field.Kind() // field's type is reflect.Value
>>> if kind == reflect.Ptr {
>>>
>>
>> This should work:
>>
>> kind = field.Elem().Kind()
>>
>>
>>
>>
>>> // FIXME How can I improve upon this truly awful hack?
>>> switch field.Type().String() {
>>> case "*int", "*int8", "*uint8", "*int16", "*uint16", "*int32",
>>> "*uint32", "*int64", "*uint64":
>>> kind = reflect.Int
>>> case "*float32", "*float64":
>>> kind = reflect.Float64
>>> }
>>> nullable = true
>>> }
>>> switch kind {
>>> case reflect.Bool:
>>> out.WriteString("bool")
>>> case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32,
>>> reflect.Int64, reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32,
>>> reflect.Uint64:
>>> out.WriteString("int")
>>> case reflect.Float32, reflect.Float64:
>>> out.WriteString("real")
>>> ...
>>> if nullable {
>>> out.WriteByte('?')
>>> }
>>> What is the correct way to achieve what I'm aiming for?
>>>
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>>> .
>>>
>> --
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