Re: [boost] Interval Library and comparison operators

From: Gabriel Dos Reis (gdr_at_[hidden])
Date: 2002-09-06 08:09:19

"Peter Dimov" <pdimov_at_[hidden]> writes:

[...]

| Another, more practical, argument is that if you specialize std::less, this
| will work:
| 
| std::set< interval > s;
| 
| std::vector< interval > v;
| std::sort(v.begin(), v.end(), less<interval>());
| 
| but this (for example) will not:
| 
| std::set< std::pair<interval, int> > s2;

Yes, but the problem isn't with interval. Is it?

| std::vector< interval > v;
| std::sort(v.begin(), v.end());

Again, this is a problem with std::less<> or interval. 
Actually, I would -not-, by default, want the above to work

| std::less<> is just a function object "alias" of operator<.

That is untrue.

| So if you want sets of intervals to work (without an explicit comparator),
| provide an operator< that is a strict weak ordering.

Well, I don't find the example you provided convincing.

std::less<> is *not* just an alias for operator<.

-- Gaby