On Tuesday, 25 March 2014 at 22:54:14 UTC, Timon Gehr wrote:
On 03/25/2014 10:29 PM, Andrei Alexandrescu wrote:

B) I want to be able to call front multiple times in a row, and expect
to get the same value.

Correct.

'map' may fail this criterion. In this case, is the blame put on the user?

Depends how you define "same" though :/ But yeah.

Also, shameless plug about my "cache" range adaptor:
https://github.com/D-Programming-Language/phobos/pull/1364

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