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Re: C++ PATCH for c++/67164 (error with variadic templates)

From: Jason Merrill <jason at redhat dot com>
To: gcc-patches List <gcc-patches at gcc dot gnu dot org>
Date: Wed, 20 Jul 2016 01:04:47 -0400
Subject: Re: C++ PATCH for c++/67164 (error with variadic templates)
Authentication-results: sourceware.org; auth=none
References: <56D8E7C5.20900@redhat.com>

On Thu, Mar 3, 2016 at 8:41 PM, Jason Merrill <jason@redhat.com> wrote:
> When we instantiate an element of a pack expansion, we replace the argument
> pack in the template argument vec with an ARGUMENT_PACK_SELECT which
> indicates the desired element of the vec.  If the args have been used to
> instantiate other templates as well, the args of those instances get
> modified as well, which can lead to strange results when we run into
> ARGUMENT_PACK_SELECT in inappropriate places.  This patch fixes this issue
> by making a copy of the template args before we start messing with them.

...so we don't need to deal with ARGUMENT_PACK_SELECT in the hash
tables anymore.

Attachment: 67164-2.diff
Description: Text document

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