idup class

[Joshua Niehus via Digitalmars-d-learn]

trying to follow:
http://ddili.org/ders/d.en/class.html

//--- OSX 10.9 DMD 2.065
module test;

class Foo {
 int num;

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

 Foo dup() const {
 return new Foo(this.num);
 }

 immutable(Foo) idup() const {
 return new immutable(Foo)(this.num);
 }
}

void main() {
 auto  foo = new Foo(1);
 auto mfoo = foo.dup();
 auto ifoo = foo.idup();
}

* test.d(15): Error: mutable method test.Foo.this is not callable
using a immutable object
* test.d(15): Error: no constructor for Foo
* Failed: [dmd, -v, -o-, test.d, -I.]
//---

What am i missing?

Re: idup class

[Joshua Niehus via Digitalmars-d-learn]

On Friday, 16 May 2014 at 20:36:37 UTC, Ali Çehreli wrote:


My apologies. The code was written for an older version of dmd. 
The simplest fix is to define the constructor as pure:


 pure this(int num) {
 this.num = num;
 }

Ali


Ahh great thanks guys.
No worries Ali, great book, i refer to it all the time :)

Re: core.sync.rwmutex example

[Joshua Niehus via Digitalmars-d-learn]

Hi Charles,

would the following work (just a shot in the dark) ?

//---
module test;

import std.stdio;
import std.concurrency;

void spawnedFuncFoo(Tid tid, Tid tidBar) {
 receive(
 (int i) {
 writeln(Foo Received the number , i);
 send(tidBar, i, thisTid);
 auto barSuccessful = receiveOnly!(string);
 writeln(Bar got my (Foo) message);
 }
 );

 send(tid, true);
}

void spawnedFuncBar(Tid tid) {
 receive(
 (int i, Tid tidFoo) {
 writeln(Foo passed me (Bar) the number , i);
 send(tidFoo, done);
 }
 );

 receive(
 (string sig) {
 writeln(Main says I'm (Bar) done.);
 send(tid, 42);
 }
 );
}

void main() {
 auto tidBar = spawn(spawnedFuncBar, thisTid);
 auto tidFoo = spawn(spawnedFuncFoo, thisTid, tidBar);
 send(tidFoo, 42);
 auto fooWasSuccessful = receiveOnly!(bool);
 assert(fooWasSuccessful);

 send(tidBar, your done);
 auto barWasSuccessful = receiveOnly!(int);
 assert(barWasSuccessful == 42);
 writeln(Successfully had two separate threads communicate
with each other);
}
//---

Atom text editor

[Joshua Niehus via Digitalmars-d-learn]

FYI:

If anyone is using GitHub's text editor Atom and would like
basic D syntax highlighting:

apm init --package ~/.atom/packages/language-d --convert
https://github.com/textmate/d.tmbundle

https://atom.io/docs/v0.94.0/converting-a-text-mate-bundle