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From: Tom Widmer (tom_usenet_at_[hidden])
Date: 2005-03-23 09:57:42

Michael Stevens wrote:

> GCC is correct. There is a get out clause in the library standard. Look at
> section 20.1.5 "Allocator requirements" paragraph 4:
> Implementations of containers described in this International Standard are
> permitted to assume that their Allocator template parameter meets the
> following two additional requirements beyond those in Table 32. All
> instances of a given allocator type are required to be interchangeable and
> always compare equal to each other. The typedef members pointer,
> const_pointer, size_type, and difference_type are required to be T*, T
> const*, size_t, and ptrdiff_t, respectively.
> I suspect many implementation (including those not in the standard) have this
> requirement!

Dinkumware's library doesn't. It is certainly something to strive for
when writing a container, since otherwise your container cannot be used
with certain useful allocators.


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