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Passing function(whose parameter would be dynamic and the type is unknown) as a parameter to another function.
Jul 08
vino.B
Jul 08
Alex
Jul 09
vino.B
Jul 09
Alex
Jul 09
vino.B
Jul 09
Alex
Jul 10
vino.B
Jul 10
Alex
Jul 10
vino.B
Jul 10
Timoses
Jul 08
Timoses
Jul 09
vino.B
Jul 09
Timoses
July 08
Hi All,

 Request you help, in the below code we pass the function "Testfun" as a parameter to another function "process" in order for the function "process" to work we have to specify the type of the parameter that is passed to the function "(T function(string, int) coRoutine, string Test, int Size) ", so now how do we pass a function whose parameter would be dynamic and the type is unknown.

void process(T)(T function(string, int) coRoutine, string Test, int Size) {
alias scRType = typeof(coRoutine(string.init, int.init));

Eg:

Run1 : process(&Testfun, Test, Size);
void process(T ...)(T function(string, int) coRoutine, string Test) {
alias scRType = typeof(coRoutine(string.init, int.init));


Run2 : process(&Testfun, Test, Size, Str1);
void process(T)(T function(string, int, string) coRoutine, string Test, int Size, string Str1) {
alias scRType = typeof(coRoutine(string.init, int.init, string.int));


Run3 : process(&Testfun, Test);
void process(T)(T function(string, string) coRoutine, string Test, int Size) {
alias scRType = typeof(coRoutine(string.init));
PFresult.get = coRoutine(args);

Some what like this

auto Testfun (string FFs, int Size) { return tuple(FFs, Size); }

void process(T ...)(T function(T args) coRoutine, T args) {
alias scRType = typeof(coRoutine(T.init));
PFresult.get = coRoutine(T);

void main() {
string Test ="C:\\Temp\\BACKUP1"; int Size = 1;
process(&Testfun, Test, Size);
}


Code : Working
import std.stdio: writeln;
import std.container.array;
import std.typecons: tuple;
import std.parallelism: taskPool;

auto Testfun (string FFs, int Size) { return tuple(FFs, Size); }

void process(T)(T function(string, int) coRoutine, string Test, int Size) {
alias scRType = typeof(coRoutine(string.init, int.init));
auto PFresult = taskPool.workerLocalStorage!scRType();
PFresult.get = coRoutine(Test, Size);
foreach(i; PFresult.toRange) { writeln(i[][]); }
}

void main() {
string Test ="C:\\Temp\\BACKUP1"; int Size = 1;
process(&Testfun, Test, Size);
}

From,
Vino.B
July 08
On Sunday, 8 July 2018 at 18:46:31 UTC, vino.B wrote:
>  Request you help, in the below code we pass the function "Testfun" as a parameter to another function "process" in order for the function "process" to work we have to specify the type of the parameter that is passed to the function "(T function(string, int) coRoutine, string Test, int Size) ", so now how do we pass a function whose parameter would be dynamic and the type is unknown.

What do you mean with a "function with dynamic parameters" and "unknown type"?

But how about

´´´
void main()
{
	process!fun();
}

void process(alias coRoutine, T...)(T params)
{
	coRoutine(params);
}

auto fun(T...)(T params)
{

}
´´´
July 08
On Sunday, 8 July 2018 at 18:46:31 UTC, vino.B wrote:
> Hi All,
>
>  Request you help, in the below code we pass the function "Testfun" as a parameter to another function "process" in order for the function "process" to work we have to specify the type of the parameter that is passed to the function "(T function(string, int) coRoutine, string Test, int Size) ", so now how do we pass a function whose parameter would be dynamic and the type is unknown.
>
> void process(T)(T function(string, int) coRoutine, string Test, int Size) {

This would templetize the return type of the coRoutine, thus within that function you could do

    T returnedValue = coRoutine(string.init, int.init);

> alias scRType = typeof(coRoutine(string.init, int.init));
>
> Eg:
>
> Run1 : process(&Testfun, Test, Size);
> void process(T ...)(T function(string, int) coRoutine, string Test) {
> alias scRType = typeof(coRoutine(string.init, int.init));
>
>
> Run2 : process(&Testfun, Test, Size, Str1);
> void process(T)(T function(string, int, string) coRoutine, string Test, int Size, string Str1) {
> alias scRType = typeof(coRoutine(string.init, int.init, string.int));
>
>
> Run3 : process(&Testfun, Test);
> void process(T)(T function(string, string) coRoutine, string Test, int Size) {
> alias scRType = typeof(coRoutine(string.init));
> PFresult.get = coRoutine(args);
>
> Some what like this
>
> auto Testfun (string FFs, int Size) { return tuple(FFs, Size); }
>
> void process(T ...)(T function(T args) coRoutine, T args) {

This would mean that if you pass a function that returns for example an int, it must also
- take an int as argument
- and process has to accept another int
e.g.
    process((int i) => i+1, 3);

if T would be (int, string) you would have to pass something like

    process((int i, string s) {
        return AliasSeq!(int, string); }, // error: not even sure how to express this
            3, "hello");

where I'm not sure how to express the return type of (int, string)... Does anybody know this? Would the Tuple Dip make this possible? (https://forum.dlang.org/post/p3bdp1$2b4e$1@digitalmars.com)

> alias scRType = typeof(coRoutine(T.init));
> PFresult.get = coRoutine(T);
>
> void main() {
> string Test ="C:\\Temp\\BACKUP1"; int Size = 1;
> process(&Testfun, Test, Size);
> }
>
>
> Code : Working
> import std.stdio: writeln;
> import std.container.array;
> import std.typecons: tuple;
> import std.parallelism: taskPool;
>
> auto Testfun (string FFs, int Size) { return tuple(FFs, Size); }
>
> void process(T)(T function(string, int) coRoutine, string Test, int Size) {
> alias scRType = typeof(coRoutine(string.init, int.init));
> auto PFresult = taskPool.workerLocalStorage!scRType();
> PFresult.get = coRoutine(Test, Size);
> foreach(i; PFresult.toRange) { writeln(i[][]); }
> }
>
> void main() {
> string Test ="C:\\Temp\\BACKUP1"; int Size = 1;
> process(&Testfun, Test, Size);
> }
>
> From,
> Vino.B

I suggest taking a look at https://dlang.org/phobos/std_traits.html .

E.g. ReturnType and Parameters:

    int func() { return 3; }
    assert(is(ReturnType!func == int));

    void gunc(int i, double j) {}
    import std.meta : AliasSeq;
    assert(is(Parameters!gunc == AliasSeq!(int, double)));


Perhaps you could tell us what your goal is. People here might come up with a nice solution. Why do you feel like having to use templated functions in the first place? That is, what is the generic goal of the functions you are trying to define?

July 09
On Sunday, 8 July 2018 at 19:22:32 UTC, Timoses wrote:
> On Sunday, 8 July 2018 at 18:46:31 UTC, vino.B wrote:
>> Hi All,
>>
>>  Request you help, in the below code we pass the function "Testfun" as a parameter to another function "process" in order for the function "process" to work we have to specify the type of the parameter that is passed to the function "(T function(string, int) coRoutine, string Test, int Size) ", so now how do we pass a function whose parameter would be dynamic and the type is unknown.
>>
>> void process(T)(T function(string, int) coRoutine, string Test, int Size) {
>
> This would templetize the return type of the coRoutine, thus within that function you could do
>
>     T returnedValue = coRoutine(string.init, int.init);
>
>> alias scRType = typeof(coRoutine(string.init, int.init));
>>
>> Eg:
>>
>> Run1 : process(&Testfun, Test, Size);
>> void process(T ...)(T function(string, int) coRoutine, string Test) {
>> alias scRType = typeof(coRoutine(string.init, int.init));
>>
>>
>> Run2 : process(&Testfun, Test, Size, Str1);
>> void process(T)(T function(string, int, string) coRoutine, string Test, int Size, string Str1) {
>> alias scRType = typeof(coRoutine(string.init, int.init, string.int));
>>
>>
>> Run3 : process(&Testfun, Test);
>> void process(T)(T function(string, string) coRoutine, string Test, int Size) {
>> alias scRType = typeof(coRoutine(string.init));
>> PFresult.get = coRoutine(args);
>>
>> Some what like this
>>
>> auto Testfun (string FFs, int Size) { return tuple(FFs, Size); }
>>
>> void process(T ...)(T function(T args) coRoutine, T args) {
>
> This would mean that if you pass a function that returns for example an int, it must also
> - take an int as argument
> - and process has to accept another int
> e.g.
>     process((int i) => i+1, 3);
>
> if T would be (int, string) you would have to pass something like
>
>     process((int i, string s) {
>         return AliasSeq!(int, string); }, // error: not even sure how to express this
>             3, "hello");
>
> where I'm not sure how to express the return type of (int, string)... Does anybody know this? Would the Tuple Dip make this possible? (https://forum.dlang.org/post/p3bdp1$2b4e$1@digitalmars.com)
>
>> alias scRType = typeof(coRoutine(T.init));
>> PFresult.get = coRoutine(T);
>>
>> void main() {
>> string Test ="C:\\Temp\\BACKUP1"; int Size = 1;
>> process(&Testfun, Test, Size);
>> }
>>
>>
>> Code : Working
>> import std.stdio: writeln;
>> import std.container.array;
>> import std.typecons: tuple;
>> import std.parallelism: taskPool;
>>
>> auto Testfun (string FFs, int Size) { return tuple(FFs, Size); }
>>
>> void process(T)(T function(string, int) coRoutine, string Test, int Size) {
>> alias scRType = typeof(coRoutine(string.init, int.init));
>> auto PFresult = taskPool.workerLocalStorage!scRType();
>> PFresult.get = coRoutine(Test, Size);
>> foreach(i; PFresult.toRange) { writeln(i[][]); }
>> }
>>
>> void main() {
>> string Test ="C:\\Temp\\BACKUP1"; int Size = 1;
>> process(&Testfun, Test, Size);
>> }
>>
>> From,
>> Vino.B
>
> I suggest taking a look at https://dlang.org/phobos/std_traits.html .
>
> E.g. ReturnType and Parameters:
>
>     int func() { return 3; }
>     assert(is(ReturnType!func == int));
>
>     void gunc(int i, double j) {}
>     import std.meta : AliasSeq;
>     assert(is(Parameters!gunc == AliasSeq!(int, double)));
>
>
> Perhaps you could tell us what your goal is. People here might come up with a nice solution. Why do you feel like having to use templated functions in the first place? That is, what is the generic goal of the functions you are trying to define?

Hi Timoses,

 We are converting a Power shell script to D in phased manner; the PS script has many functions and we converted few function to D in Phase 1.

Phase 1:

Structure of the Program
  Main -> Thread Manager->CoFunction1(Fs1,2,3,4,5)
  Main -> Thread Manager->CoFunction2(Fs1,2,3,4,5)


The thread manager will call the Cofunctions and the function gets executed on “N” of file systems each of size 5-10 TB.

The function that we transformed all has the same number of parameters (3) and the type was same (string, string, int), so we wrote a static thread manager as below

void ptManager (T)(T function(string, string, int) coRoutine, Array!string Dirlst, string Step, int Size) {
     alias scRType = typeof(coRoutine(string.init, string.init, int.init));
     auto PFresult = taskPool.workerLocalStorage!scRType();
     ReturnType!coRoutine rData;
    foreach (string FFs; parallel(Dirlst[0 .. $],1)) { PFresult.get ~= coRoutine(FFs.strip, Step); }
     foreach(i; PFresult.toRange) { writeln(i[][]); }
}

void main () {
ptManager(&function1, Fn1Dirlst, Step, Size);
ptManager(&function2, Fn2Dirlst, Step, Age);

}

Phase 2:

In phase 2 we are transferring few more function to the existing D code, and these functions has variable number of parameter and different type eg: Function3(string, string, string), Function(string, int, string, int).

Initially I tried to re-write the ptManager function for each type of function which ended with 8 ptManager functions, Eg : ptManager1(string, string, int), ptManager2(string, string, string), ptManager3(string,int), so now trying as to whether we can use 1 ptManager function which can process function with “N” of parameter and types to process all the function, hence trying to implement the Variadic function. Hence request your help and suggestion to achieve this.

Command Parameter to all the functions:
Array!string Dirlist : This parameter will contain the the Fs names
File logF: This parameter is used to store the outoput
File logE: This parameter is used to store the Error Information.

Rest of the function has variable parameters/type.

From,
Vino.B




July 09
On Monday, 9 July 2018 at 05:54:27 UTC, vino.B wrote:
>
> In phase 2 we are transferring few more function to the existing D code, and these functions has variable number of parameter and different type eg: Function3(string, string, string), Function(string, int, string, int).
>
> Initially I tried to re-write the ptManager function for each type of function which ended with 8 ptManager functions, Eg : ptManager1(string, string, int), ptManager2(string, string, string), ptManager3(string,int), so now trying as to whether we can use 1 ptManager function which can process function with “N” of parameter and types to process all the function, hence trying to implement the Variadic function. Hence request your help and suggestion to achieve this.


Variadic templates to the rescue:

void ptManager1(Fn, Args...)(Fn coRoutine, Array!string Dirlst, Args args)
if (__traits(compiles, coRoutine("", args)))
{
    alias scRType = typeof(coRoutine("", args));
    auto PFresult = taskPool.workerLocalStorage!scRType();
    foreach (string FFs; parallel(Dirlst[], 1)) {
        PFresult.get ~= coRoutine(FFs.strip, args);
    }
    foreach(i; PFresult.toRange) { writeln(i[][]); }
}

unittest {
    ptManager1(&function1, Fn1Dirlst, Step, Size);
    ptManager1(&function2, Fn2Dirlst, Step, Age);
}


Alternatively, pass the co-routine as an alias:

void ptManager2(alias coRoutine, Args...)(Array!string Dirlst, Args args)
if (__traits(compiles, coRoutine("", args)))
{
    alias scRType = typeof(coRoutine("", args));
    auto PFresult = taskPool.workerLocalStorage!scRType();
    foreach (string FFs; parallel(Dirlst[], 1)) {
        PFresult.get ~= coRoutine(FFs.strip, args);
    }
    foreach(i; PFresult.toRange) { writeln(i[][]); }
}

unittest {
    ptManager2!function1(Fn1Dirlst, Step, Size);
    ptManager2!function2(Fn2Dirlst, Step, Age);
}

These options are essentially equivalent; the main reason to prefer the first is if the functions are passed around at runtime. If you don't do that, ptManager2 may be slightly faster.

Using logE and logF is left as an exercise for the reader. :p


As an aside, I first thought of making a less generic ptManager that'd work something like this:

    ptManager3(dir => function1(dir, Step, Size), Fn1Dirlst);

However, since the return value changes between functions, that doesn't really buy us much - we'll still have to templatize ptManager3 on the return type, and the contents of the function will be very much the same.

--
  Simen
July 09
On Monday, 9 July 2018 at 05:54:27 UTC, vino.B wrote:
> On Sunday, 8 July 2018 at 19:22:32 UTC, Timoses wrote:
>> Perhaps you could tell us what your goal is. People here might come up with a nice solution. Why do you feel like having to use templated functions in the first place? That is, what is the generic goal of the functions you are trying to define?
>
> Hi Timoses,
>
>  We are converting a Power shell script to D in phased manner; the PS script has many functions and we converted few function to D in Phase 1.
>
> Phase 1:
>
> Structure of the Program
>   Main -> Thread Manager->CoFunction1(Fs1,2,3,4,5)
>   Main -> Thread Manager->CoFunction2(Fs1,2,3,4,5)
>
>
> The thread manager will call the Cofunctions and the function gets executed on “N” of file systems each of size 5-10 TB.
>
> The function that we transformed all has the same number of parameters (3) and the type was same (string, string, int), so we wrote a static thread manager as below
>
> void ptManager (T)(T function(string, string, int) coRoutine, Array!string Dirlst, string Step, int Size) {
>      alias scRType = typeof(coRoutine(string.init, string.init, int.init));
>      auto PFresult = taskPool.workerLocalStorage!scRType();
>      ReturnType!coRoutine rData;
>     foreach (string FFs; parallel(Dirlst[0 .. $],1)) { PFresult.get ~= coRoutine(FFs.strip, Step); }
>      foreach(i; PFresult.toRange) { writeln(i[][]); }
> }
>
> void main () {
> ptManager(&function1, Fn1Dirlst, Step, Size);
> ptManager(&function2, Fn2Dirlst, Step, Age);
>
> }
>
> Phase 2:
>
> In phase 2 we are transferring few more function to the existing D code, and these functions has variable number of parameter and different type eg: Function3(string, string, string), Function(string, int, string, int).
>
> Initially I tried to re-write the ptManager function for each type of function which ended with 8 ptManager functions, Eg : ptManager1(string, string, int), ptManager2(string, string, string), ptManager3(string,int), so now trying as to whether we can use 1 ptManager function which can process function with “N” of parameter and types to process all the function, hence trying to implement the Variadic function. Hence request your help and suggestion to achieve this.
>
> Command Parameter to all the functions:
> Array!string Dirlist : This parameter will contain the the Fs names
> File logF: This parameter is used to store the outoput
> File logE: This parameter is used to store the Error Information.
>
> Rest of the function has variable parameters/type.
>
> From,
> Vino.B

Ok, interesting. I don't really know my way around parallelism, though I think you should take a look at Alex's suggestion (https://forum.dlang.org/post/adepbwetsiuwguuaaizs@forum.dlang.org) for a template solution. You could e.g. do

    void ptManager(alias func, T ...)(T args)
    {
        import std.traits : Parameters, ReturnType;
        static assert(is(Parameters!func == T), "Arguments don't fit function!");
        alias RetType = ReturnType!func;

        // only receive value if return type is not void
        static if (!is(RetType == void))
            RetType mVal = func(args);

        // write it to stdout if mVal is a valid symbol
        // (could also combine that in the above static if...)
        static if (is(typeof(mVal)))
        {
            import std.stdio : writeln;
            writeln(mVal);
        }
    }

    unittest
    {
        ptManager!((int i) => i+1)(2);
        void someDelegate(string s1, string s2, int i1) { /* ... */ }
        ptManager!someDelegate("hello", "ptManager", 100);
    }
July 09
On Sunday, 8 July 2018 at 19:10:24 UTC, Alex wrote:
> On Sunday, 8 July 2018 at 18:46:31 UTC, vino.B wrote:
>>  Request you help, in the below code we pass the function "Testfun" as a parameter to another function "process" in order for the function "process" to work we have to specify the type of the parameter that is passed to the function "(T function(string, int) coRoutine, string Test, int Size) ", so now how do we pass a function whose parameter would be dynamic and the type is unknown.
>
> What do you mean with a "function with dynamic parameters" and "unknown type"?
>
> But how about
>
> ´´´
> void main()
> {
> 	process!fun();
> }
>
> void process(alias coRoutine, T...)(T params)
> {
> 	coRoutine(params);
> }
>
> auto fun(T...)(T params)
> {
>
> }
> ´´´

HI Alex,

 I tried you method, but it not working as expected, the process!fun1(Test1) works but the process!fun2(Test1, Size ) does not work, instead of displaying the value (Test, 1) it output's the parameter "Test1".

Output:
Test
Test1

If I comment process!fun1(Test1); then the output is same

Output :
Test1

import std.stdio: writeln;


void main()
{
    string Test1 = "Test";
    int Size = 1;
    process!fun1(Test1);
    process!fun2(Test1, Size );
}

void process(alias coRoutine, T...)(T params)
{
	coRoutine(params);
}

auto fun1(T...)(T params)
{
   writeln(params);
}

auto fun2(T...)(T params)
{
   writeln(params);
}

From,
Vino.B
July 09
On Monday, 9 July 2018 at 15:40:53 UTC, vino.B wrote:
> On Sunday, 8 July 2018 at 19:10:24 UTC, Alex wrote:
>> On Sunday, 8 July 2018 at 18:46:31 UTC, vino.B wrote:
>>>  Request you help, in the below code we pass the function "Testfun" as a parameter to another function "process" in order for the function "process" to work we have to specify the type of the parameter that is passed to the function "(T function(string, int) coRoutine, string Test, int Size) ", so now how do we pass a function whose parameter would be dynamic and the type is unknown.
>>
>> What do you mean with a "function with dynamic parameters" and "unknown type"?
>>
>> But how about
>>
>> ´´´
>> void main()
>> {
>> 	process!fun();
>> }
>>
>> void process(alias coRoutine, T...)(T params)
>> {
>> 	coRoutine(params);
>> }
>>
>> auto fun(T...)(T params)
>> {
>>
>> }
>> ´´´
>
> HI Alex,
>
>  I tried you method, but it not working as expected, the process!fun1(Test1) works but the process!fun2(Test1, Size ) does not work, instead of displaying the value (Test, 1) it output's the parameter "Test1".
>
> Output:
> Test
> Test1
>
> If I comment process!fun1(Test1); then the output is same
>
> Output :
> Test1
>
> import std.stdio: writeln;
>
>
> void main()
> {
>     string Test1 = "Test";
>     int Size = 1;
>     process!fun1(Test1);
>     process!fun2(Test1, Size );
> }
>
> void process(alias coRoutine, T...)(T params)
> {
> 	coRoutine(params);
> }
>
> auto fun1(T...)(T params)
> {
>    writeln(params);
> }
>
> auto fun2(T...)(T params)
> {
>    writeln(params);
> }
>
> From,
> Vino.B

As I can see, this is the expected output.
The "1" after "Test" is the value of parameter "Size"...
July 09
On Monday, 9 July 2018 at 15:49:50 UTC, Alex wrote:
> On Monday, 9 July 2018 at 15:40:53 UTC, vino.B wrote:
>> On Sunday, 8 July 2018 at 19:10:24 UTC, Alex wrote:
>>> On Sunday, 8 July 2018 at 18:46:31 UTC, vino.B wrote:
>>>>  Request you help, in the below code we pass the function "Testfun" as a parameter to another function "process" in order for the function "process" to work we have to specify the type of the parameter that is passed to the function "(T function(string, int) coRoutine, string Test, int Size) ", so now how do we pass a function whose parameter would be dynamic and the type is unknown.
>>>
>>> What do you mean with a "function with dynamic parameters" and "unknown type"?
>>>
>>> But how about
>>>
>>> ´´´
>>> void main()
>>> {
>>> 	process!fun();
>>> }
>>>
>>> void process(alias coRoutine, T...)(T params)
>>> {
>>> 	coRoutine(params);
>>> }
>>>
>>> auto fun(T...)(T params)
>>> {
>>>
>>> }
>>> ´´´
>>
>> HI Alex,
>>
>>  I tried you method, but it not working as expected, the process!fun1(Test1) works but the process!fun2(Test1, Size ) does not work, instead of displaying the value (Test, 1) it output's the parameter "Test1".
>>
>> Output:
>> Test
>> Test1
>>
>> If I comment process!fun1(Test1); then the output is same
>>
>> Output :
>> Test1
>>
>> import std.stdio: writeln;
>>
>>
>> void main()
>> {
>>     string Test1 = "Test";
>>     int Size = 1;
>>     process!fun1(Test1);
>>     process!fun2(Test1, Size );
>> }
>>
>> void process(alias coRoutine, T...)(T params)
>> {
>> 	coRoutine(params);
>> }
>>
>> auto fun1(T...)(T params)
>> {
>>    writeln(params);
>> }
>>
>> auto fun2(T...)(T params)
>> {
>>    writeln(params);
>> }
>>
>> From,
>> Vino.B
>
> As I can see, this is the expected output.
> The "1" after "Test" is the value of parameter "Size"...

Hi Alex,

 Thank you a lot, i was able to improvise using your logic, and i need more help, the below code is working as expected using your logic, now how do i get the return type of the function

Request Help:
void process(alias coRoutine, T...)(Array!string Dirlst, T params)
{
      ReturnType!coRoutine rData;   ///// This line is not working
      alias scRType = typeof(coRoutine(string.init, T.init));
      auto PFresult = taskPool.workerLocalStorage!scRType();
      foreach (string FFs; parallel(Dirlst[],1)) { PFresult.get ~= coRoutine(FFs, params); }
      foreach(i; PFresult.toRange) { rData ~= i[][]; }
}

Error:
test.d(206): Error: template instance `std.traits.ReturnType!(coAgedDirClean)` does not match template declaration ReturnType(func...) if (func.length == 1 && isCallable!func)


Working Code:
auto coAgedDirClean(T...)(string FFs, T params)  {
     auto dFiles = Array!(Tuple!(string, SysTime))(dirEntries(FFs, SpanMode.shallow).filter!(a => a.isFile && a.size > params[0]).map!(a => tuple(a.name, a.timeLastModified)));
     return dFiles;
}

auto coAgedDirDelete(T...)(string FFs, T params)  {
     auto dFiles = Array!(Tuple!(string, SysTime))(dirEntries(FFs, SpanMode.shallow).filter!(a => a.isFile && a.size > params[0]).map!(a => tuple(a.name, a.timeLastModified)));
     if (params[1] == "run" && !dFiles.empty) {  foreach(d; parallel(dFiles[], 1)) { remove(d[0]); }}
     return dFiles;
}

void process(alias coRoutine, T...)(Array!string Dirlst, T params)
{
      alias scRType = typeof(coRoutine(string.init, T.init));
      auto PFresult = taskPool.workerLocalStorage!scRType();
      foreach (string FFs; parallel(Dirlst[],1)) { PFresult.get ~= coRoutine(FFs, params); }
      foreach(i; PFresult.toRange) { writeln(i[][]); }
}

void main()
{
    Array!string AgedDir, DeleteDir;
    AgedDir.insert("C:\\Temp\\TEAM1");
    DeleteDir.insert("C:\\Temp\\BACKUP1");
    ulong Size = 102;
    string Step = "run";
    process!coAgedDirClean(AgedDir, Size );
    process!coAgedDirDelete(DeleteDir, Size, Step);
}

From,
Vino.B
July 09
On Monday, 9 July 2018 at 17:26:30 UTC, vino.B wrote:
>
> Request Help:
> void process(alias coRoutine, T...)(Array!string Dirlst, T params)
> {
>       ReturnType!coRoutine rData;   ///// This line is not working
>       alias scRType = typeof(coRoutine(string.init, T.init));
>       auto PFresult = taskPool.workerLocalStorage!scRType();
>       foreach (string FFs; parallel(Dirlst[],1)) { PFresult.get ~= coRoutine(FFs, params); }
>       foreach(i; PFresult.toRange) { rData ~= i[][]; }
> }
>
> Error:
> test.d(206): Error: template instance `std.traits.ReturnType!(coAgedDirClean)` does not match template declaration ReturnType(func...) if (func.length == 1 && isCallable!func)

Yeah... for ReturnType to work, you need a function, but you have only a template.

The easy solution is to execute the template and to ask the result for its type:

´´´
void main()
{
	process!fun();
}

void process(alias coRoutine, T...)(T params)
{
	auto res = coRoutine(params);
	pragma(msg, typeof(res));
}

auto fun(T...)(T params)
{
	return 42;
}
´´´

If you need it in advance... It is a little bit longer. There was a place, where I used this once...

See
https://run.dlang.io/is/Xy6Xf4

However, I wonder why you need this, especially as your process is void. Why not just using auto for results of the coroutines?
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