with

**arjunajay** · 06-24-2005

Does C++ have a 'with' key word as in Java?
The 'with' key word is used to avoid repetition of object name ???
I Java, some thing like :

Code:

obj.get_data();
if(obj.check()) obj.rectify();
obj.display();
obj.reset();

could be simplified with, the use of 'with' as :

Code:

with obj{
  get_data();
  if(check()) rectify();
  display();
  reset();
}

I know that the introduction of such a keyword if it doesn't exist will cause scope prblms.
But it seems really helpful in Java.
P.S. I Don't know Java very well;
neither have I programmed with it.
(^_^)!.

**grumpy** · 06-24-2005

Originally Posted by arjunajay

Does C++ have a 'with' key word as in Java?

No.

Originally Posted by arjunajay

I know that the introduction of such a keyword if it doesn't exist will cause scope prblms.

That is one of several reasons it is not in C++; C++ supports multiple inheritence of implementation, so there are a lot of cases where the "with" logic would simply not work, or be ambiguous.

**CornedBee** · 06-24-2005

Java doesn't have a with keyword...

**Darryl** · 06-24-2005

I have sort of imitated that behavior by having the methods return a reference to the object so that you can then chain them together like

Code:

obj& obj::getdata()
{
    //do stuff
    return *this;
}
//same for other functions

obj.getdata()
     .display()
     .reset();

Ofcourse, the "if" statement from your example can't be easiliy integrated into this but the others work

**arjunajay** · 06-24-2005

Originally Posted by CornedBee

Java doesn't have a with keyword...

It doesn't? (I did give you fair warning. (^_^)).

Let me refer the book once more and try to give you the actual code given in the book. (If I can find it again in the library).

**CornedBee** · 06-24-2005

It doesn't. I think you're confusing it with JavaScript, which does have the with keyword.

Originally Posted by The Java Language Specification

3.9 Keywords
The following character sequences, formed from ASCII letters, are reserved for use as keywords and cannot be used as identifiers (§3.8):

Keyword: one of

Code:

	abstract    default    if            private      this
	boolean     do         implements    protected    throw
	break       double     import        public       throws
	byte        else       instanceof    return       transient
	case        extends    int           short        try
	catch       final      interface     static       void
	char        finally    long          strictfp     volatile
	class       float      native        super        while
	const       for        new           switch
	continue    goto       package       synchronized

As you can see, "with" is not there.

**pianorain** · 06-24-2005

Perhaps you were thinking of VB?

Code:

With...End With allows you to perform a series of statements on a specified object
without requalifying the name of the object. For example, to change a number of
different properties on a single object, place the property assignment statements
within the With...End With, referring to the object once instead of referring to it
with each property assignment. The following example illustrates use of
With...End With to assign values to several properties of the same object:

With MyLabel
   .Height = 2000
   .Width = 2000
   .Text = "This is MyLabel"
End With

**grumpy** · 06-25-2005

IIRC, some versions of Pascal and related languages have the "with" keyword which functions as described.

**Sang-drax** · 06-25-2005

Pascal has a 'with' keyword.

**arjunajay** · 06-25-2005

I think it could have been Java script...
But certainly noy Pascal or VB.
More over I would have mistaken the beginer's book in javascript for java.
Any wayI can't find the book again...
But I still ask why that seems a good help in the languages specified, but not implemented in C++?

**Daved** · 06-25-2005

They don't like adding new keywords to the language, and you can get similar functionality without it. Just make a reference variable with a single letter name and it will be close enough without the ambiguity.

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