From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-464997-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 3302 invoked by alias); 26 Oct 2014 10:25:01 -0000
Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Id: <gcc-bugs.gcc.gnu.org>
List-Archive: <http://gcc.gnu.org/ml/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-help@gcc.gnu.org>
Sender: gcc-bugs-owner@gcc.gnu.org
Received: (qmail 3266 invoked by uid 48); 26 Oct 2014 10:24:56 -0000
From: "shunichi_wakabayashi at yahoo dot co.jp" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/63648] New: compile error w/ pointer argument of result_of-is_same-enable_if returns
Date: Sun, 26 Oct 2014 10:34:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 4.8.2
X-Bugzilla-Keywords:
X-Bugzilla-Severity: normal
X-Bugzilla-Who: shunichi_wakabayashi at yahoo dot co.jp
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags:
X-Bugzilla-Changed-Fields: bug_id short_desc product version bug_status bug_severity priority component assigned_to reporter attachments.created
Message-ID: <bug-63648-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: 7bit
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-SW-Source: 2014-10/txt/msg02018.txt.bz2

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63648

            Bug ID: 63648
           Summary: compile error w/ pointer argument of
                    result_of-is_same-enable_if returns
           Product: gcc
           Version: 4.8.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: shunichi_wakabayashi at yahoo dot co.jp

Created attachment 33811
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33811&action=edit
compile error with gcc 4.8.2

As my attached file, declaration of template functions with pointer arguments
indicate to result-type of specific type_traits functions like,

 enable_if<is_same<result_of<TEMPLATE_ARG()>::type>, any_type>::value,
int>::type*

can trigger compile error with following messages,


> prog.cc:20:5: error: no matching function for call to 'invoke_func'
>    invoke_func(0, retint);
>    ^~~~~~~~~~~
> prog.cc:12:30: note: candidate template ignored: substitution failure [with FUNC = int (*)(int)]
> template<typename FUNC> void invoke_func(


the error could be resolved if changing TEMPLATE_ARG to NON_TEMPLATE_ARG or
pointer to normal value or moving enable_if<...> trick to outside of function
arguments declaration (e.g. auto funcname(...) -> enable_if<...>::type)

for example, when changing line #13 to like follows, the error disappears:
    typename enable_if<is_integral<typename
result_of<INTFUNC(int)>::type>::value>::type*, // not template arg
or
    typename enable_if<is_integral<typename
result_of<FUNC(int)>::type>::value>::type, // not pointer


this problem cannot be occurred with gcc 4.9.x

is it a known bug?

thanks