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[C++14] Add is_final type trait.

From: Ed Smith-Rowland <3dw4rd at verizon dot net>
To: "libstdc++ at gcc dot gnu dot org" <libstdc++ at gcc dot gnu dot org>, gcc-patches <gcc-patches at gcc dot gnu dot org>, Jonathan Wakely <jwakely dot gcc at gmail dot com>
Date: Sat, 13 Sep 2014 21:58:14 -0400
Subject: [C++14] Add is_final type trait.
Authentication-results: sourceware.org; auth=none

We've had __has_final built-in for a good while.
the std library component is_final was added to C++14 - which is now good.
I noticed while looking at the latest SD-6 draft.

So here is a simple patch that builds and passes clean on x86_64-linux.

OK?

Attachment: CL_is_final
Description: Text document

Attachment: patch_is_final
Description: Text document

Follow-Ups:
- Re: [C++14] Add is_final type trait.
  - From: Jonathan Wakely

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