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[PATCH] Implement P0393R3

From: "Tim Shen via libstdc++" <libstdc++ at gcc dot gnu dot org>
To: "libstdc++" <libstdc++ at gcc dot gnu dot org>
Date: Sun, 1 Jan 2017 04:17:33 -0800
Subject: [PATCH] Implement P0393R3
Authentication-results: sourceware.org; auth=none
Reply-to: Tim Shen <timshen at google dot com>

I used a bit of macro to save typing (and execerise DRY!), and
cleverness on comparing valueless_by_exception variant against valid
ones (since variant_npos + 1 == 0).

Tested 20_util/variant/* on x86_64-linux-gnu in debug mode.


-- 
Regards,
Tim Shen

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- Re: [PATCH] Implement P0393R3
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