On 6/5/23 6:43 AM, Ferhat Kurtulmuş wrote:
> On Monday, 5 June 2023 at 10:01:01 UTC, John Xu wrote:
>> The parseDOM returns a DOMEntity(R) type, how do I write a xmlRoot as global variable?
>> I need its detailed type (auto / Variant doesn't work).
>>
>>
>>         import dxml.dom;
>>         ?? xmlRoot;
>>         int main() {
>>             string xml = readText("a.xml");
>>             auto dom = parseDOM(xml);
>>             xmlRoot = dom.children[0];
>>         }
> ```d
> import dxml.dom;
> import std.stdio;
> 
>      DOMEntity!string xmlRoot;
>      int main()
>      {
>          string xml = "<some></some>";
>          auto dom = parseDOM(xml);
>          writeln(typeof(dom.children[0]).stringof); // yields "DOMEntity!string"
>          xmlRoot = dom.children[0];
>          return 0;
>      }
>      ```


In general, the easiset thing to do is use typeof, though it's not always pretty (and not always obvious how to write it). However, it's required for voldemort types.

```d
typeof(parseDom("")) DomEntity;
```

-Steve

On Tuesday, 6 June 2023 at 14:16:37 UTC, Steven Schveighoffer wrote:
> On 6/5/23 6:43 AM, Ferhat Kurtulmuş wrote:
>> On Monday, 5 June 2023 at 10:01:01 UTC, John Xu wrote:
>>> [...]
>> ```d
>> import dxml.dom;
>> import std.stdio;
>> 
>>      DOMEntity!string xmlRoot;
>>      int main()
>>      {
>>          string xml = "<some></some>";
>>          auto dom = parseDOM(xml);
>>          writeln(typeof(dom.children[0]).stringof); // yields "DOMEntity!string"
>>          xmlRoot = dom.children[0];
>>          return 0;
>>      }
>>      ```
>
>
> In general, the easiset thing to do is use typeof, though it's not always pretty (and not always obvious how to write it). However, it's required for voldemort types.
>
> ```d
> typeof(parseDom("")) DomEntity;
> ```
>
> -Steve
İt is one of the nicest features of d. I believe it should not be used too often because it may cause longer compilation times, worse code reading, less comfort with d code scanners, editors etcetera.