Function Template for Dynamic Parameter

[Timoses]

On Thursday, 5 July 2018 at 16:23:36 UTC, vino.B wrote:
> Hi All,
>
>   Request your help on the below code
>
> auto coCleanFiles(T ...) (T FFs) {
>     auto dFiles = Array!(Tuple!(string, 
> SysTime))(dirEntries(FFs, SpanMode.depth).map!(a => 
> tuple(a.name, a.timeCreated)));
> 	return dFiles;
> }
>
> void process(T)(T pfunction, Array!string Dirlst) {
> alias wlsType = typeof(pfunction(T));
> auto Result = taskPool.workerLocalStorage!wlsType();
> foreach (FFs; parallel(Dirlst[],1)) { Result.get ~= 
> pfunction(FFs); }
> foreach(i; Result.toRange) { writeln(i[][]); }
> }
>
> void main() {
> Array!string Cleanlst;
> Cleanlst.insert("C:\\Temp\\BACKUP1");
> process(&coCleanFiles, Cleanlst);
> }
>
> Error : Error: coCleanFiles(T...)(T FFs) is not an lvalue and 
> cannot be modified

I guess since in above code `coCleanFiles` is a template, you can 
not simply take the address of that function template. You'd have 
to instantiate the template first

     process(&coCleanFiles!string, ...)

If you want to pass the template to process you could define 
process as something like

     void process(alias func)(Array!string Dirlst)
     {
         func!string(Dirlst[0]);
     }

and call

     process!coCleanFiles(Cleanlst);