On Wed, Oct 5, 2016 at 10:47 AM, Marc Glisse <marc.gli...@inria.fr> wrote: > On Wed, 5 Oct 2016, Jason Merrill wrote: >> On Wed, Oct 5, 2016 at 5:29 AM, Marek Polacek <pola...@redhat.com> wrote: >>> On Wed, Oct 05, 2016 at 08:58:08AM +0200, Marc Glisse wrote: >>>> On Tue, 4 Oct 2016, Jason Merrill wrote: >>>> >>>>> C++17 adds the ability to omit the template arguments for a class >>>>> template when declaring a variable with an initializer, much like auto >>>>> but supporting a wider variety of initialization. This is intended to >>>>> replace functions like make_tuple. >>>> >>>> Nice. Is there a macro to test for this feature? I couldn't find it in >>>> the >>>> latest sg10 list. >>> >>> And in a similar vein, is there a macro for Selection statements with >>> initializer? Can't find it anywhere. >> >> Not currently, for either. The rationale for not defining macros for >> some features is that for convenience features like this, anyone >> concerned about portability will just write code the old way. > > Thanks. Sadly, this ignores the case of a library that wants to provide an > explicit deduction guide for its own types to progressive users compiling > with a C++17 compiler, without preventing C++14 users from using the library > the old way.
True, that's a compelling argument for having a macro for deduction guides. I'll propose that to SG10. Jason
