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Re: [C++ Patch] PR 79790 ("[C++17] ICE class template argument deduction")

From: Nathan Sidwell <nathan at acm dot org>
To: Paolo Carlini <paolo dot carlini at oracle dot com>, "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>
Cc: Jason Merrill <jason at redhat dot com>
Date: Fri, 14 Jul 2017 13:51:17 -0400
Subject: Re: [C++ Patch] PR 79790 ("[C++17] ICE class template argument deduction")
Authentication-results: sourceware.org; auth=none
References: <25e893cd-0bf5-4c5e-24b7-70daba6793dc@oracle.com>

On 07/14/2017 01:32 PM, Paolo Carlini wrote:

While working on the bug I also noticed that we can simplify a bit the code
generating the implicit deduction guides: if I'm not mistaken, when we pass
types as first argument of build_deduction_guide - for implicit guides, that is
- the deduction guide is never explicit. thus DECL_NONCONVERTING_P is never
true. It's an unrelated tweak, anyway, which we can consider applying by itself
if we don't change the code generating the implicit deduction guides.

I recall wondering the same thing when adding the 'elided = true' pieces, butdidn't investigate enough to confirm/deny. Thanks for getting this.


nathan

--
Nathan Sidwell

References:
- [C++ Patch] PR 79790 ("[C++17] ICE class template argument deduction")
  - From: Paolo Carlini

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