Whitch can replace std::bind/boost::bind ?

[Ali Çehreli via Digitalmars-d-learn]

On 03/18/2016 09:14 AM, Dsby wrote:
> On Friday, 18 March 2016 at 11:09:37 UTC, Atila Neves wrote:
>> On Friday, 18 March 2016 at 10:50:34 UTC, Dsby wrote:
>>>
>>> foreach (i ; 0..4) {
>>>     auto th = new Thread(delegate(){listRun(i);});//this is erro
>>>     _thread[i]= th;
>>>     th.start();
>>> }
>>>
>>> void listRun(int i)
>>> {
>>>      writeln("i = ", i); // the value is not(0,1,2,3), it all is 2.
>>> }
>>>
>>>
>>> I want to know how to use it like std::bind.
>>
>> I would suggest not using Thread directly:
>>
>> foreach(i; 0..4) {
>>     auto tid = spawn(&listRun, i); //from std.concurrency
>>     _tid[i] = tid;
>> }
>>
>> Atila
>
>
> the listrun is in class. it is a delegate,it is not a function.

Here is one that puts 'shared' in a lot of places:

import std.stdio;
import std.concurrency;

class C {
     int i;

     this (int i) shared {
         this.i = i;
     }

     void listRun() shared {
         writeln("listRun for ", i);
     }
}

void worker(shared(C) c) {
     c.listRun();
}

void main() {
     Tid[4] _tid;

     foreach(i; 0..4) {
         auto c = new shared(C)(i);
         auto tid = spawn(&worker, c);
         _tid[i] = tid;
     }
}

Here is an equivalent that casts to and from 'shared' before and after 
the thread call:

import std.stdio;
import std.concurrency;

class C {
     int i;

     this (int i) {
         this.i = i;
     }

     void listRun() {
         writeln("listRun for ", i);
     }
}

void worker(shared(C) c_shared) {
     auto c = cast(C)c_shared;
     c.listRun();
}

void main() {
     Tid[4] _tid;

     foreach(i; 0..4) {
         auto c = new C(i);
         auto c_shared = cast(shared(C))c;
         auto tid = spawn(&worker, c_shared);
         _tid[i] = tid;
     }
}

Ali