Re: overloading the global new/delete operator in octave

[Soeren Sonnenburg]

On Mon, 2009-08-03 at 00:13 -0700, Sergei Steshenko wrote: 
> 
> 
> --- On Sun, 8/2/09, Soeren Sonnenburg <address@hidden> wrote:
> 
> > From: Soeren Sonnenburg <address@hidden>
> > Subject: overloading the global new/delete operator in octave
> > To: "Octave users list" <address@hidden>
> > Date: Sunday, August 2, 2009, 11:45 AM
> > Dear all,
> > 
> > I am a bit puzzled why my overloaded global new[] operator
> > does not
> > become effective when building a octave extension (it works
> > with
> > python/matlab though)...
[...] 
> It's probably a (wrong) long shot, but try
> 
> fprintf(stderr, "test\n");
> 
> - you know, (un)buffered output. Experimentally stdout sometimes takes a
> lot of time/output to get flushed.

That was not the cause (and I still don't know what could potentially
cause it). However, I managed to create a an isolated toy example which
works just fine :-) So there could be a problem related to interactions
between the two libraries I link against (which in fact implement this
overloading...). Anyway working isolated example follows:

#include <octave/config.h>
#include <octave/ov.h>
#include <octave/defun-dld.h>

#include <stdio.h>

#include <new>
void* operator new(std::size_t size) throw (std::bad_alloc)
{
        void *p=malloc(size);

    fprintf(stderr, "alloc %p %lld\n", p, (long long int) size);
        return p;
}

void operator delete(void *p)
{
    fprintf(stderr, "free %p\n", p);
        if (p)
                free(p);
}

void* operator new[](std::size_t size) throw (std::bad_alloc)
{
        void *p=malloc(size);

    fprintf(stderr, "alloc[] %p %lld\n", p, (long long int) size);

        return p;
}

void operator delete[](void *p)
{
    fprintf(stderr, "free[] %p\n", p);

        if (p)
                free(p);
}

DEFUN_DLD (shogun, prhs, nlhs, "shogun.")
{
    fprintf(stderr, "start\n");
    volatile int* foo = new int[2];
        delete[] foo;
    fprintf(stderr, "end\n");
        return octave_value_list();
}

Soeren
-- 
For the one fact about the future of which we can be certain is that it
will be utterly fantastic. -- Arthur C. Clarke, 1962

signature.asc
Description: This is a digitally signed message part