This is the mail archive of the gcc-patches@gcc.gnu.org mailing list for the GCC project.

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]
Other format:	[Raw text]

Re: Lambda templates and implicit function templates.

From: Jason Merrill <jason at redhat dot com>
To: Adam Butcher <adam at jessamine dot co dot uk>
Cc: gcc-patches at gcc dot gnu dot org, Gabriel Dos Reis <gdr at integrable-solutions dot net>, Andrew Sutton <andrew dot n dot sutton at gmail dot com>
Date: Mon, 02 Sep 2013 14:51:21 -0400
Subject: Re: Lambda templates and implicit function templates.
Authentication-results: sourceware.org; auth=none
References: <1377632573-14453-1-git-send-email-adam at jessamine dot co dot uk> <52239E13 dot 4000301 at redhat dot com> <ab38021ad5f67da5b99684e779d09dcf at imap dot force9 dot net>

On 09/02/2013 02:27 PM, Adam Butcher wrote:

Bug 41933 is specifically about lambda capture; I think you're
running into something else.

The problem is in expanding the 'ts' capture from the 5.1.2.5.  It
looks like this:

   1 auto vglambda = [](auto printer) {
   2   return [=](auto&& ... ts) { // OK: ts is a function parameter pack
   3     printer(std::forward<decltype(ts)>(ts)...);
   4     return [=]() {
   5       printer(ts ...);
   6     };
   7   };
   8 };

It is the expansion of the captured 'ts' on line 5 that I think yields
the bug.

Ah, yes, that is 41933. I thought you were saying that a testcasewithout the innermost lambda would fail.


Jason

References:
- Re: Lambda templates and implicit function templates.
  - From: Jason Merrill
- Re: Lambda templates and implicit function templates.
  - From: Adam Butcher

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]