C++ PATCH for C++17 class template placeholders

[Jason Merrill]

On Wed, Oct 5, 2016 at 5:29 AM, Marek Polacek <polacek@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.

Jason