Isn't
Object* ptr=NULL;
try
{
ptr = new (xyz);
}
catch (...)
{
}
if (ptr == NULL)
// kill your idols here
a way to go?
Henk
Stephen Gilfillan wrote:
Hi,
I am using GCC and not CW. I would also like to be able to get new to
return NULL
instead of throwing an exception (for subsequent checking).
I'm not able to include <new> as this file doesn't seem to exist
in the GCC world. Consequently 'nothrow' is not recongnised by the GCC
compiler.
If anyone has managed to do this using GCC it would be great to hear
from you.
I've looked at using the G++ compiler switch "-fcheck-new: - Check that
the pointer
returned by operator new is non-null before attempting to modify the
storage allocated."
I think I will probably need to use this in any event, but it doesn't
solve my problem.
I also compile with "-fno-exceptions" to keep a handle on the size of
the prc!
many thanks in advance
Steve
At 10:14 AM +0200 10/18/02, Thomas Damme wrote:
>Hello,
>
>I found out, that the operator new just fails and quits the program
without any comment if there is not enough space to create an (C++)
object.
>Can you give me some suggestions how to solve this?
>I dont want to wrap every new[] into ErrTry..ErrCatch in my code. A
single function that returns the object or NULL would be nice.
>Is there some kind wrapper-function to create an object via
MemPtrNew() ?
>(Anyway, if you think Exceptions are the ultimate way, write me.)
[ General C++ advice, not really Palm-specific ]
new will throw a bad_alloc exception if it is unable to allocate the
space.
This is what you are seeing. I suspect that ErrTry & ErrCatch will NOT
catch this
behavior, since these are native C++ exceptions, not PalmOS exceptions.
However, there is a 'nothrow' variant of new, which will return NULL
instead
of throwing.
Instead of writing: pFoo = new Foo;
you write: pFoo = new (nothrow) Foo;
(yeah, I know it looks strange).
If you use the "nothrow" variation, you need to be sure to include the
standard header <new> first, and unless you add a "using std::nothrow" to
the top of your sourcefile, you'll also need to namespace qualify the item
as "std::nothrow".
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