Re: Memory issue

James Kanze <>
Tue, 11 Aug 2009 03:11:00 -0700 (PDT)
On Aug 10, 11:44 pm, Juha Nieminen <nos...@thanks.invalid> wrote:

Alf P. Steinbach wrote:

This default response can be overridden in three ways:

  * By replacing the class' operator new (this is just an
    unfortunate name for the allocation function; it's
    *called* by a 'new' expression, which after that call
    proceeds to call the specified constructor, i.e. you're
    not overriding what a 'new' expression does by defining
    operator new).

  * By replacing the global namespace operator new (ditto

  * By installing a new-handler (see set_new_handler, I
    think the name was).

Actually there's a fourth: Write your own memory allocator and
give it to your std::vector instance as template parameter.
(Not that this would be any easier than any of the above, but
just pointing out.)

It's not a question of easier; each solution does something
different. Replacing the class' operator new doesn't affect
allocations in an std::vector. Replacing the global operator
new, or installing a new handler, affects all allocations,
everywhere. Using a custom memory allocator affects only
allocations in the vector itself.

James Kanze (GABI Software)
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