Patches for the allocators (malloc/debug).

[Dhruv Matani]

Hello,

I don't know what the intention was in making malloc_allocator not throw
anything but that makes it non-compliant, and also the user is not
warned about any unsuccessful allocations, So I have added that check.

Also, I have added another check in debug_allocator for checking whether
a NULL pointer was passed.


-- 
	-Dhruv Matani.
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2004-03-05  Dhruv Matani  <dhruvbird@gmx.net>

	* ext/malloc_allocator.h: Fixed the construct function to call
	global placement new instead of assignment. Added a check after
	the return from malloc to check whether returned pointer is NULL,
	and if so, throw std::bad_alloc().
	* ext/debug_allocator.h: Added a check in the deallocate function
	to check whether the user has passed a NULL pointer or not.
	

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