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* [Bug c++/63648] New: compile error w/ pointer argument of result_of-is_same-enable_if returns
@ 2014-10-26 10:34 shunichi_wakabayashi at yahoo dot co.jp
2014-10-26 12:57 ` [Bug c++/63648] " shunichi_wakabayashi at yahoo dot co.jp
2014-10-27 14:59 ` redi at gcc dot gnu.org
0 siblings, 2 replies; 3+ messages in thread
From: shunichi_wakabayashi at yahoo dot co.jp @ 2014-10-26 10:34 UTC (permalink / raw)
To: gcc-bugs
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
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c++/63648] compile error w/ pointer argument of result_of-is_same-enable_if returns
2014-10-26 10:34 [Bug c++/63648] New: compile error w/ pointer argument of result_of-is_same-enable_if returns shunichi_wakabayashi at yahoo dot co.jp
@ 2014-10-26 12:57 ` shunichi_wakabayashi at yahoo dot co.jp
2014-10-27 14:59 ` redi at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: shunichi_wakabayashi at yahoo dot co.jp @ 2014-10-26 12:57 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63648
--- Comment #1 from s-wakaba <shunichi_wakabayashi at yahoo dot co.jp> ---
Comment on attachment 33811
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33811
compile error with gcc 4.8.2
at line #13
typename enable_if<is_same<typename result_of<FUNC(int)>::type, int>::value,
int>::type*, // error with gcc 4.8.x
typename enable_if<is_same<typename result_of<FUNC(int)>::type, int>::value,
int>::type, // OK - not pointer
typename enable_if<is_same<typename result_of<INTFUNC(int)>::type, int>::value,
int>::type*, // OK - not template arg
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c++/63648] compile error w/ pointer argument of result_of-is_same-enable_if returns
2014-10-26 10:34 [Bug c++/63648] New: compile error w/ pointer argument of result_of-is_same-enable_if returns shunichi_wakabayashi at yahoo dot co.jp
2014-10-26 12:57 ` [Bug c++/63648] " shunichi_wakabayashi at yahoo dot co.jp
@ 2014-10-27 14:59 ` redi at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: redi at gcc dot gnu.org @ 2014-10-27 14:59 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63648
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |DUPLICATE
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I think this is a duplicate of PR 23055 which was fixed for 4.9.0
*** This bug has been marked as a duplicate of bug 23055 ***
^ permalink raw reply [flat|nested] 3+ messages in thread
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2014-10-26 10:34 [Bug c++/63648] New: compile error w/ pointer argument of result_of-is_same-enable_if returns shunichi_wakabayashi at yahoo dot co.jp
2014-10-26 12:57 ` [Bug c++/63648] " shunichi_wakabayashi at yahoo dot co.jp
2014-10-27 14:59 ` redi at gcc dot gnu.org
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