Re: [boost] [range] Proposal: addition of front(), back(), at(), operator[]

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 03/25/2014 01:50 PM, Marshall Clow wrote:

On Mar 24, 2014, at 10:36 AM, Marshall Clow wrote:

...

Interesting. I think that in C++14, the committee put that possibility to bed. See LWG issue 2360 http://cplusplus.github.io/LWG/lwg-defects.html#2360

I’ll open an issue that gets that cleared up.

Thinking about this some more, I think that “may” is the key there.

[forward.iterators] says: • 6 If a and b are both dereferenceable, then a == b if and only if *a and *b are bound to the same object.

which disallows “stashing iterators” for forward (or greater) iterators.

So, I think that [iterator.requirements.general] 9 can only really be true for input iterators.

That's always been my understanding. \e -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQEcBAEBAgAGBQJTMwVEAAoJEAeJsEDfjLbX2UQH/3xdwzJFwq77IYIwaa20hcMY eRB3oqjc7SBDgwfA/rxrmnyjk1VZTO16zV4SsSWhBNLgN6UV6GhgECguoD6Ru6VG BWHZQqPp+o6dsxjIntMtPSipqIs+nZTQpw7SkNGqsQ2VpUqb/rlUCT22MslKqWtU j/BnmtFGZpuQ/OXsiQGeJwQPwLDAj1qo/J+TUJymJ58nU8BAL/doSVDfKKkJR3xA 02HdjXx62upeDdw35fXCkaAMvVa/uzS1En4cajTKVQkzhkZRw81TxCVmYVXG6nbL Fdb7hxRWkC8F6wbxeNuF5cRQ4upYBhD4Tnl0NkF8oIh1W2G9bSG9KTTvn/yPGFg= =ChA8 -----END PGP SIGNATURE-----