www.digitalmars.com         C & C++   DMDScript  

digitalmars.D.learn - need `this` on trying to use class method with parallelism Task! or

reply Alexey <animuspexus protonmail.com> writes:
/home/animuspexus/dlang/d_v2.098.0/dmd/generated/linux/release/64/../../../../../phobos/std
parallelism.d(436): Error: need `this` for `threadFunc` of type `void()`
./t.d(22): Error: template instance 
`std.parallelism.Task!(threadFunc)` error instantiating


thou documentation says `a function (or delegate or other 
callable)`

```D

import std.stdio;
import std.parallelism;


class TC {
	
	void threadFunc()
	{
		import core.thread;
		import core.time;
		
		scope(exit) writeln("threadFunc done");
		
		core.thread.osthread.Thread.getThis.sleep(msecs(2000));
		
	}
	
	void threadCreator()
	{
		scope(exit) writeln("threadCreator done");
		auto t1 = Task!threadFunc;
		t1.executeInNewThread();
		
	}
	
}


void main()
{
	scope(exit) writeln("main done");
	
	auto tc = new TC;
	tc.threadCreator();
	
}

```
Nov 14 2021
next sibling parent Alexey <animuspexus protonmail.com> writes:
On Sunday, 14 November 2021 at 12:01:36 UTC, Alexey wrote:

 		auto t1 = Task!threadFunc;


if this line rewritten as `auto t1 = Task!(TC.threadFunc, this);`

```text
/home/animuspexus/dlang/d_v2.098.0/dmd/generated/linux/release/64/../../../../../phobos/std
parallelism.d(451): Error: tuple `Args` is used as a type
/home/animuspexus/dlang/d_v2.098.0/dmd/generated/linux/release/64/../../../../../phobos/std
parallelism.d(533): Error: tuple `Args` is used as a type
/home/animuspexus/dlang/d_v2.098.0/dmd/generated/linux/release/64/../../../../../druntime/import/core/int
rnal/traits.d(191): Error: template instance `pred!(this)` does not match
template declaration `isAssignable(Lhs, Rhs = Lhs)`
/home/animuspexus/dlang/d_v2.098.0/dmd/generated/linux/release/64/../../../../../pho
os/std/meta.d(842): Error: template instance
`t.TC.threadCreator.allSat!(isAssignable, this)` error instantiating
/home/animuspexus/dlang/d_v2.098.0/dmd/generated/linux/release/64/../../../../../phobos/std
parallelism.d(541):        instantiated from here: `allSatisfy!(isAssignable,
this)`
./t.d(22):        instantiated from here: `Task!(threadFunc, 
this)`
```
Nov 14 2021
prev sibling next sibling parent Alexey <animuspexus protonmail.com> writes:
On Sunday, 14 November 2021 at 12:01:36 UTC, Alexey wrote:

 /home/animuspexus/dlang/d_v2.098.0/dmd/generated/linux/release/64/../../../../../phobos/std
parallelism.d(436): Error: need `this` for `threadFunc` of type `void()`


Go example for contrast. Ideally, I'd like something similar;

```Go
package main

import (
	"fmt"
	"time"
)

type TC struct {
}

func (self *TC) threadFunc() {
	defer fmt.Println("threadFunc done")
	time.Sleep(time.Duration(time.Second * 2))
}

func (self *TC) threadCreator() {
	defer fmt.Println("threadCreator done")
	go self.threadFunc()
}

func main() {
	defer fmt.Println("main done")
	tc := new(TC)
	tc.threadCreator()
}
```
Nov 14 2021
prev sibling parent reply Andrey Zherikov <andrey.zherikov gmail.com> writes:
On Sunday, 14 November 2021 at 12:01:36 UTC, Alexey wrote:

 


You just need two changes:
- make `threadFunc` function static: `static void threadFunc()`
- use `task` instead of `Task`: `auto t1 = task!threadFunc;`
Nov 14 2021
parent reply Alexey <animuspexus protonmail.com> writes:
On Sunday, 14 November 2021 at 14:24:00 UTC, Andrey Zherikov 
wrote:

 On Sunday, 14 November 2021 at 12:01:36 UTC, Alexey wrote:

 


 You just need two changes:
 - make `threadFunc` function static: `static void threadFunc()`
 - use `task` instead of `Task`: `auto t1 = task!threadFunc;`


I need `this` to be available inside of threadFunc
Nov 14 2021
parent reply Andrey Zherikov <andrey.zherikov gmail.com> writes:
On Sunday, 14 November 2021 at 14:41:21 UTC, Alexey wrote:

 On Sunday, 14 November 2021 at 14:24:00 UTC, Andrey Zherikov 
 wrote:

 On Sunday, 14 November 2021 at 12:01:36 UTC, Alexey wrote:

 


 You just need two changes:
 - make `threadFunc` function static: `static void threadFunc()`
 - use `task` instead of `Task`: `auto t1 = task!threadFunc;`


 I need `this` to be available inside of threadFunc



Just do `auto t1 = task(&threadFunc)` in `threadCreator` then.
Nov 14 2021
parent reply Alexey <animuspexus protonmail.com> writes:
On Sunday, 14 November 2021 at 16:40:58 UTC, Andrey Zherikov 
wrote:

 Just do `auto t1 = task(&threadFunc)` in `threadCreator` then.



Error: value of `this` is not known at compile time

```D
import std.stdio;
import std.parallelism;

class TC
{
     void threadFunc()
     {
         import core.thread;
         import core.time;

         scope (exit)
             writeln("threadFunc done");

         core.thread.osthread.Thread.getThis.sleep(msecs(2000));
     }

     void threadCreator()
     {
         scope (exit)
             writeln("threadCreator done");

         auto t1 = task!(&threadFunc);
         t1.executeInNewThread();
     }
}

void main()
{
     scope (exit)
         writeln("main done");

     auto tc = new TC;
     tc.threadCreator();
}
```
Nov 14 2021
next sibling parent reply Imperatorn <johan_forsberg_86 hotmail.com> writes:
On Sunday, 14 November 2021 at 16:55:24 UTC, Alexey wrote:

 On Sunday, 14 November 2021 at 16:40:58 UTC, Andrey Zherikov 
 wrote:

 Just do `auto t1 = task(&threadFunc)` in `threadCreator` then.



 Error: value of `this` is not known at compile time

 ```D
 import std.stdio;
 import std.parallelism;

 class TC
 {
     void threadFunc()
     {
         import core.thread;
         import core.time;

         scope (exit)
             writeln("threadFunc done");

         core.thread.osthread.Thread.getThis.sleep(msecs(2000));
     }

     void threadCreator()
     {
         scope (exit)
             writeln("threadCreator done");

         auto t1 = task!(&threadFunc);
         t1.executeInNewThread();
     }
 }

 void main()
 {
     scope (exit)
         writeln("main done");

     auto tc = new TC;
     tc.threadCreator();
 }
 ```


Try task(&threadFunc) instead of task!(&threadFunc)
Nov 14 2021
parent Alexey <animuspexus protonmail.com> writes:
On Sunday, 14 November 2021 at 17:42:18 UTC, Imperatorn wrote:

 Try task(&threadFunc) instead of task!(&threadFunc)


worked! huge thanks!
Nov 14 2021
prev sibling parent Andrey Zherikov <andrey.zherikov gmail.com> writes:
On Sunday, 14 November 2021 at 16:55:24 UTC, Alexey wrote:

 


Remove "!"
Nov 14 2021