"Daniel James" <daniel@calamity.org.uk> wrote in message news:d1pmd5$tl2$1@sea.gmane.org... | Thorsten Ottosen wrote: | | > if equality isn't defined, then it makes little sense to use them as index in | > a hash-based | > container. In fact, it won't compile. | | But equality isn't prohibited. So an implementation could supply it. with what purpose? Even so, it must be far easier to write an empty function with a static assert for those cases that should not use the default than to do the opposite. | Or | a non-standard hash container could. Does anyone supply it? If so, with what semantics? Even so, does the extreamely rare situation, that a hash-container is used as index in a hash-container, justify that we should not use a generic default ? -Thorsten