Mixin/static if issue

[jfondren]

On Wednesday, 25 August 2021 at 22:52:23 UTC, DLearner wrote:
> On Wednesday, 25 August 2021 at 22:33:00 UTC, H. S. Teoh wrote:
> [...}
>>
>> I think what you meant to write is:
>>
>>        static if (typeof(mixin(VarName)).stringof == "uint") {
>>
>> You want the type of the variable named by VarName, not the 
>> type of VarName.
>>
>>
>> T
>
> I understand your reasoning, but:
>
> ```
> void main() {
>    import std.stdio;
>
>    uint TestVar = 5;
>
>    string mxnWrite_Size_t(string VarName) {
>
>       static if (typeof(mixin(VarName)).stringof == "uint") {
>
>          return `write("` ~ VarName ~ `");`;
>       } else {
>
>          return `writeln("Apparently TestVar not a uint");`;	
> 	  }
>    }
>
>    mixin(mxnWrite_Size_t("TestVar"));
> }
> ```
> produced Error: variable `VarName` cannot be read at compile 
> time

Contrast:

```d
void main() {
    import std.stdio;

    uint TestVar = 5;

    string mxnWrite_Size_t(string VarName)() {

       static if (typeof(mixin(VarName)).stringof == "uint") {

          return `write("` ~ VarName ~ `");`;
       } else {

          return `writeln("Apparently TestVar not a uint");`;	
	  }
    }

    mixin(mxnWrite_Size_t!"TestVar");
}
```

Output: TestVar