id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
13438	Boost Config check for std::optional	Tony E Lewis <TonyELewis@…>	John Maddock	"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."	Feature Requests	closed	To Be Determined	config	Boost 1.66.0	Problem	obsolete	boost,config,c++17,optional