[Vala] Read from InputStream using read(2) semantic

2012-11-01 Thread Ma Xiaojun 

Hi,

read(2) is a system call like this:
ssize_t read(int fd, void *buf, size_t count)

I believe that Vala 0.10 has read method like this:
ssize_t read (uint8[] buffer, size_t count, Cancellable? cancellable = null)

You should see the similarity.

I'm dealing with some code that uses 0.10 read() in multiple places.

However, count parameter seems to be removed in later Vala versions 
since the code doesn't compile with later Vala versions.


I noted that there is new method called read_bytes() that provides 
similar semantic.

http://valadoc.org/#!api=gio-2.0/GLib.InputStream.read_bytes

However, 0.14 says it doesn't know the type Bytes while 0.16 says it 
doesn't know read_bytes() method.


Do I have to use 0.18? Can I have read(2) semantic on 0.12/0.14/0.16?

A more general question, is there versioned Vala documentation available 
online?

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[Vala] Setting and getting properties at the same time

2012-11-01 Thread foracc 

Hello list,

I stumbled on some (for me) unexpected behaviour when setting and 
getting a property at the same time, which is not consistend with simple 
types like int.


When doing something like

int x = (myclass.myproperty = y);

x will be set to y, and not whatever mycalss.myproperty will be (or what 
was mycalss.myproperty set to before). Is this a limitation of Vala?


The code below shows this behaviour and should be pretty self-explanatory.

-- snip --

public class myclass : Object
{
   private int _number;

   public int number {
  set { _number = value * 2; }
  get { return _number; }
   }
}

public void main(string[] args)
{
   myclass m = new myclass();
   int i = 2;

   m.number = 2;

   // prints 4, ok
   stdout.printf(number: %d\n, m.number);

   // prints 3, not 6 (or at least 4)
   stdout.printf(number: %d\n, m.number = 3);

   // prints 6, ok
   stdout.printf(number: %d\n, m.number);

   / prints 5, ok
   stdout.printf(i: %d\n, i = 5);
}

-- snip --
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Re: [Vala] Setting and getting properties at the same time

2012-11-01 Thread Jarosław Ciupiński 
I think that it is pretty consistent and expected behaviour not only in
Vala but in other languages as well (as long as they allow such things). I
would be worried if it would work other way around. Example:

int x, y;
x = 2;
y = x = 3;

I expect that both y and x will have same value, 3. I would not like to get
y=2 and x=3.

I hope that this clears things up but I also wonder in which language it
works differently.

JC

2012/11/1 foracc for...@d00m.info

 Hello list,

 I stumbled on some (for me) unexpected behaviour when setting and getting
 a property at the same time, which is not consistend with simple types like
 int.

 When doing something like

 int x = (myclass.myproperty = y);

 x will be set to y, and not whatever mycalss.myproperty will be (or what
 was mycalss.myproperty set to before). Is this a limitation of Vala?

 The code below shows this behaviour and should be pretty self-explanatory.

 -- snip --

 public class myclass : Object
 {
private int _number;

public int number {
   set { _number = value * 2; }
   get { return _number; }
}
 }

 public void main(string[] args)
 {
myclass m = new myclass();
int i = 2;

m.number = 2;

// prints 4, ok
stdout.printf(number: %d\n, m.number);

// prints 3, not 6 (or at least 4)
stdout.printf(number: %d\n, m.number = 3);

// prints 6, ok
stdout.printf(number: %d\n, m.number);

/ prints 5, ok
stdout.printf(i: %d\n, i = 5);
 }

 -- snip --
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Re: [Vala] Setting and getting properties at the same time

2012-11-01 Thread Edwin Dlca 
int x, y = 9;

2012/11/1 Jarosław Ciupiński kotow...@gmail.com

 I think that it is pretty consistent and expected behaviour not only in
 Vala but in other languages as well (as long as they allow such things). I
 would be worried if it would work other way around. Example:

 int x, y;
 x = 2;
 y = x = 3;

 I expect that both y and x will have same value, 3. I would not like to get
 y=2 and x=3.

 I hope that this clears things up but I also wonder in which language it
 works differently.

 JC

 2012/11/1 foracc for...@d00m.info

  Hello list,
 
  I stumbled on some (for me) unexpected behaviour when setting and getting
  a property at the same time, which is not consistend with simple types
 like
  int.
 
  When doing something like
 
  int x = (myclass.myproperty = y);
 
  x will be set to y, and not whatever mycalss.myproperty will be (or what
  was mycalss.myproperty set to before). Is this a limitation of Vala?
 
  The code below shows this behaviour and should be pretty
 self-explanatory.
 
  -- snip --
 
  public class myclass : Object
  {
 private int _number;
 
 public int number {
set { _number = value * 2; }
get { return _number; }
 }
  }
 
  public void main(string[] args)
  {
 myclass m = new myclass();
 int i = 2;
 
 m.number = 2;
 
 // prints 4, ok
 stdout.printf(number: %d\n, m.number);
 
 // prints 3, not 6 (or at least 4)
 stdout.printf(number: %d\n, m.number = 3);
 
 // prints 6, ok
 stdout.printf(number: %d\n, m.number);
 
 / prints 5, ok
 stdout.printf(i: %d\n, i = 5);
  }
 
  -- snip --
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Re: [Vala] Setting and getting properties at the same time

2012-11-01 Thread foracc 
I just checked it out with C# and it shows exactly the same behaviour. I 
expected it to do


x = 3;
y = x;

rather than

x = 3;
y = 3;

Very interesting and good to know.




I think that it is pretty consistent and expected behaviour not only in
Vala but in other languages as well (as long as they allow such things). I
would be worried if it would work other way around. Example:

int x, y;
x = 2;
y = x = 3;

I expect that both y and x will have same value, 3. I would not like to get
y=2 and x=3.

I hope that this clears things up but I also wonder in which language it
works differently.

JC

2012/11/1 foracc for...@d00m.info


Hello list,

I stumbled on some (for me) unexpected behaviour when setting and getting
a property at the same time, which is not consistend with simple types like
int.

When doing something like

int x = (myclass.myproperty = y);

x will be set to y, and not whatever mycalss.myproperty will be (or what
was mycalss.myproperty set to before). Is this a limitation of Vala?

The code below shows this behaviour and should be pretty self-explanatory.

-- snip --

public class myclass : Object
{
private int _number;

public int number {
   set { _number = value * 2; }
   get { return _number; }
}
}

public void main(string[] args)
{
myclass m = new myclass();
int i = 2;

m.number = 2;

// prints 4, ok
stdout.printf(number: %d\n, m.number);

// prints 3, not 6 (or at least 4)
stdout.printf(number: %d\n, m.number = 3);

// prints 6, ok
stdout.printf(number: %d\n, m.number);

/ prints 5, ok
stdout.printf(i: %d\n, i = 5);
}

-- snip --
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