Javari's Reference Immutability

[Regan Heath]

On Thu, 27 Jul 2006 18:39:29 -0600, Hasan Aljudy <hasan.aljudy at gmail.com>  
wrote:
> You say that Java's String class implies alot of copying, therefor it's  
> bad. However, you fail to realize that copying when modifying is exactly  
> what COW stands for. COW is a kind of honor-system protocol implemented  
> by phobos. Everytime phobos thinks it needs to modify a string which it  
> doesn't own, it makes a copy first to keep the original string intact.  
> In Java, this can be done by creating a StringBuffer from the String  
> (which creates a copy), after that, any modification you make to  
> StringBuffer happens in-place; no needless copying.

Sure. But are you trying to tell me that this..

String foo(String a) { .. return modified a .. }
String bar(String a) { .. return modified a .. }
String baz(String a) { .. return modified a .. }
String bob(String a) { .. return modified a .. }

String s = foo(bar(baz(bob("test"))));

Will result in _no_ needless copying?

Regan