AMDG On 05/28/2011 02:00 PM, Matt Calabrese wrote:
On Sat, May 28, 2011 at 4:16 PM, Steven Watanabe <watanabesj@gmail.com>wrote: Sorry, this is sort of on a tangent, but this is, imo, one of the problems with what would have been 0x concepts. According to N2914, LessThanComparable is an auto concept, meaning that as long as a type has an operation that matches the pseudo-signature bool operator< ( T const&, T const& ), then that type is LessThanComparable, even though the compiler can't really "check" the axioms. So in hypothetical 0x concept-land, checking if double models LessThanComparable would yield true.
That's usually what we want, because double is close enough to being LessThanComparable as long as you avoid NaNs.
Most auto concepts that have axioms are scary.
In Christ, Steven Watanabe