Re: Garbage collection in C++

James Kanze <>
Fri, 21 Nov 2008 02:16:16 -0800 (PST)
On Nov 21, 12:37 am, (Stefan Ram) wrote:

George Kettleborough <> writes:

I suppose what I don't get is why you would ever want to
create objects on the stack. It's something you can't do in

  I just read this in

John B. Matthews wrote in <nospam-20B427.16262820112...@news.motzarella.o=


|I was pleasantly surprised by the speed of the JScience
|library, possibly due to stack-based allocation afforded
|by Javolution, on which Jscience is based. (...)


  (End of quotation from

      =BBObjects can be allocated on the "stack" and transparently
      recycled. With Javolution , your application is busy doing
      the real work not memory management (e.g. Javolution
      RealtimeParser is 3-5x faster than conventional XML
      parsers only because it does not waste 2/3 of the CPU
      doing memory allocation/garbage collection).=AB

I'm not sure that this is quite relevant to the original
question. The poster said that he didn't get "why *you* would
ever want to create objects on the stack". In Java, you can't
create objects on the stack. The compiler, of course, works
under more or less the same "as if" rule as a C++ compiler; it
can do more or less anything it wants, as long as the output of
your program doesn't change. Including allocating variables on
the stack, even if you've written "new" in your code. (Note
that a C++ could theoretically do this as well. But trying to
identify cases where it would be applicable is probably wasted
effort on the part of the compiler, because if the object could
have been on the stack, the programmer wouldn't have used

James Kanze (GABI Software)
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