Re: [boost] std::optional<T>

On Monday 22 April 2013 12:45:58 Fernando Cacciola wrote:

On 22-Apr-13 12:09 PM, Mathias Gaunard wrote:

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On 22/04/2013 15:05, Fernando Cacciola wrote:

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On 22-Apr-13 9:37 AM, Nathan Crookston wrote:

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Fernando Cacciola wrote:

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Hi People,

I'm pleased to announce that thanks to the outstanding effort of Andrzej Krzemienski who wrote the standard papers, and Ville Voutilainen who champion it during the meetings, we now have std::optional<T> in C++14!

Great news! I'm almost scared to ask, but what did the committee decide concerning optional?

LOL, I knew people would ask. Well, they decided to drop it from C++14.

That's not what I remember.

I thought that what was said is that optional didn't need to be specialized,

That's technically correct.

So I should have said that our proposed specialization for T& was dropped.

First, congratulations! I'm happy to see this component is making its way into the standard. Second, if I understand correctly, without specializing optional for references, optional will be suboptimal (i.e. it will essentially be a pointer and a bool instead of just a pointer). Why not requiring this optimization?