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From: "mitchnull+gcc at gmail dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/53039] New: [C++11]including <functional> breaks std::is_convertible with template-pack expansion Date: Thu, 19 Apr 2012 07:57:00 -0000 [thread overview] Message-ID: <bug-53039-4@http.gcc.gnu.org/bugzilla/> (raw) http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53039 Bug #: 53039 Summary: [C++11]including <functional> breaks std::is_convertible with template-pack expansion Classification: Unclassified Product: gcc Version: 4.8.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ AssignedTo: unassigned@gcc.gnu.org ReportedBy: mitchnull+gcc@gmail.com Created attachment 27185 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27185 test code #include <functional> in the following code causes compile failure. Without the include, it compiles fine: #include <type_traits> #include <functional> // without this include, it compiles template <bool... Bs_> struct Bools { static const bool value = true; }; template <typename... Ts_> struct Types { template <typename... Us, typename std::enable_if< Bools<std::is_convertible<Us, Ts_>::value...>::value, bool>::type = false> int foo(Us&&...) { return sizeof...(Us); } }; int main() { Types<int, int> t; return t.foo(1, 1); } Output: $ gcc -v Using built-in specs. COLLECT_GCC=gcc COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/lto-wrapper Target: x86_64-unknown-linux-gnu Configured with: /build/src/gcc-4.7-20120324/configure --prefix=/usr --libdir=/usr/lib --libexecdir=/usr/lib --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=https://bugs.archlinux.org/ --enable-languages=c,c++,ada,fortran,go,lto,objc,obj-c++ --enable-shared --enable-threads=posix --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-clocale=gnu --disable-libstdcxx-pch --enable-libstdcxx-time --enable-gnu-unique-object --enable-linker-build-id --with-ppl --enable-cloog-backend=isl --enable-lto --enable-gold --enable-ld=default --enable-plugin --with-plugin-ld=ld.gold --with-linker-hash-style=gnu --disable-multilib --disable-libssp --disable-build-with-cxx --disable-build-poststage1-with-cxx --enable-checking=release Thread model: posix gcc version 4.8.0 20120407 (experimental) [trunk revision 186212] (Debian 20120407-1) $ /usr/lib/gcc-snapshot/bin/g++ -std=c++11 functional_bug.cpp functional_bug.cpp: In instantiation of 'struct Types<int, int>': functional_bug.cpp:21:21: required from here functional_bug.cpp:15:9: error: wrong number of template arguments (3, should be 2) In file included from functional_bug.cpp:1:0: /usr/lib/gcc-snapshot/lib/gcc/i486-linux-gnu/4.8.0/../../../../include/c++/4.8.0/type_traits:1264:12: error: provided for 'template<class _From, class _To> struct std::is_convertible' functional_bug.cpp: In function 'int main()': functional_bug.cpp:22:14: error: 'struct Types<int, int>' has no member named 'foo'
next reply other threads:[~2012-04-19 7:57 UTC|newest] Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top 2012-04-19 7:57 mitchnull+gcc at gmail dot com [this message] 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 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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