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From: "daniel.kruegler at googlemail dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/53039] [4.7/4.8 Regression] including <functional> breaks std::is_convertible with template-pack expansion Date: Fri, 20 Apr 2012 06:49:00 -0000 [thread overview] Message-ID: <bug-53039-4-6Tp4iUsLDo@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-53039-4@http.gcc.gnu.org/bugzilla/> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53039 --- Comment #7 from Daniel Krügler <daniel.kruegler at googlemail dot com> 2012-04-20 06:48:39 UTC --- I'm pretty sure that this is not related with <functional>, but instead with some interaction between the <tuple> header and std::is_convertible. The following variant still demonstrates the problem (I deliberately changed some of the original names used in the code to be sure that they are not cause of the problem): #include <tuple> template<bool, class T> struct enable_if { typedef T type; }; template <bool...> struct Bs { static const bool value = true; }; template <typename... Ts> struct AType { template <typename... Us, typename enable_if< Bs<std::is_convertible<Us, Ts>::value...>::value, bool>::type = false > int foo(Us&&...) { return sizeof...(Us); } }; int main() { AType<int, int> t; return t.foo(1, 1); } (You can also add <type_traits>, but it is already added via <tuple>). If we now add upfront template <class, class> struct is_convertible { static const bool value = true; }; and replace the usage of std::is_convertible by is_convertible, the error does no longer occur.
next prev parent reply other threads:[~2012-04-20 6:49 UTC|newest] Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top 2012-04-19 7:57 [Bug c++/53039] New: [C++11]including " mitchnull+gcc at gmail dot com 2012-04-19 8:00 ` [Bug c++/53039] " mitchnull+gcc at gmail dot com 2012-04-19 8:00 ` mitchnull+gcc at gmail dot com 2012-04-19 8:43 ` redi at gcc dot gnu.org 2012-04-19 10:48 ` [Bug c++/53039] [4.7/4.8 Regression] including " paolo.carlini at oracle dot com 2012-04-19 14:51 ` hjl.tools at gmail dot com 2012-04-19 16:01 ` paolo.carlini at oracle dot com 2012-04-20 6:49 ` daniel.kruegler at googlemail dot com [this message] 2012-04-20 9:07 ` paolo.carlini at oracle dot com 2012-04-20 10:27 ` paolo.carlini at oracle dot com 2012-04-20 12:38 ` paolo.carlini at oracle dot com 2012-04-26 14:02 ` rguenth at gcc dot gnu.org 2012-04-26 14:23 ` rguenth at gcc dot gnu.org 2012-05-02 11:46 ` jakub at gcc dot gnu.org 2012-06-11 5:59 ` jason at gcc dot gnu.org 2012-06-14 8:47 ` rguenth at gcc dot gnu.org 2012-06-14 10:03 ` paolo.carlini at oracle dot com 2012-07-05 17:16 ` jason at gcc dot gnu.org 2012-07-05 19:39 ` jason at gcc dot gnu.org 2012-07-05 21:25 ` jason at gcc dot gnu.org 2012-07-06 1:34 ` [Bug c++/53039] [4.7 " jason at gcc dot gnu.org 2012-09-13 10:31 ` paolo.carlini at oracle dot com 2012-09-20 10:28 ` jakub at gcc dot gnu.org 2012-11-29 20:18 ` jason at gcc dot gnu.org 2012-11-29 20:57 ` jason at gcc dot gnu.org
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