[Boost-bugs] [Boost C++ Libraries] #13438: Boost Config check for std::optional

Subject: [Boost-bugs] [Boost C++ Libraries] #13438: Boost Config check for std::optional
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2018-02-06 07:24:18

#13438: Boost Config check for std::optional
-----------------------------------------+--------------------------
 Reporter:  Tony E Lewis <TonyELewis@…>  |      Owner:  John Maddock
     Type:  Feature Requests             |     Status:  new
Milestone:  To Be Determined             |  Component:  config
  Version:  Boost 1.66.0                 |   Severity:  Problem
 Keywords:  boost,config,c++17,optional  |
-----------------------------------------+--------------------------
 Please can you add a check for the availability of C++17's
 `std::optional`. I think this would be really helpful because:
  * AFAIA, the major compilers all now have `optional` in `std::` (rather
 than in `std::experimental::`)
  * I get the impression that people are fast adopting `std::optional` as a
 standard part of their type vocabulary.
  * I know at least one other ticket (ticket:12175) that's declining to
 support `std::optional` until Boost Config offers this feature test.

 I'm not sure about Boost Config's policy about how it interacts with the
 standard's
 [http://en.cppreference.com/w/User:D41D8CD98F/feature_testing_macros
 feature testing macros] (which include one for `std::optional`). If you
 expect other libraries to use those feature tests directly, please can you
 point me to documentation for that policy that I can we can point other
 library devs to?

 Thanks very much.

-- 
Ticket URL: <https://svn.boost.org/trac10/ticket/13438>
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