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* [Bug c++/63267] New: Static member of template class is not constructed before it's used. @ 2014-09-15 8:07 yuxiao1985 at hotmail dot com 2014-09-15 9:01 ` [Bug c++/63267] " redi at gcc dot gnu.org ` (2 more replies) 0 siblings, 3 replies; 4+ messages in thread From: yuxiao1985 at hotmail dot com @ 2014-09-15 8:07 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63267 Bug ID: 63267 Summary: Static member of template class is not constructed before it's used. Product: gcc Version: 4.4.7 Status: UNCONFIRMED Severity: major Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: yuxiao1985 at hotmail dot com // test.cpp #include <iostream> using namespace std; struct Output { Output(); void doIt() { cout<<"do it a:"<<a<<"\n";} int a; }; Output::Output(): a(100) { cout<<"Output constructed\n"; } template <class T> class Test { public: static void use(const Output& ) { } static int callStaticMember(); static Output out; }; template <class T> Output Test<T>::out; template <class T> int Test<T>::callStaticMember() { use(out); out.doIt(); return 0; } int a = Test<int>::callStaticMember(); int main() { return 0; } The result is not correct. the static member should be constructed first. ---------------------------- [yxiao2@centos:~]$ g++ test.cpp [yxiao2@centos:~]$ ./a.out do it a:0 Output constructed ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/63267] Static member of template class is not constructed before it's used. 2014-09-15 8:07 [Bug c++/63267] New: Static member of template class is not constructed before it's used yuxiao1985 at hotmail dot com @ 2014-09-15 9:01 ` redi at gcc dot gnu.org 2014-09-17 13:57 ` paolo.carlini at oracle dot com 2021-08-09 19:51 ` pinskia at gcc dot gnu.org 2 siblings, 0 replies; 4+ messages in thread From: redi at gcc dot gnu.org @ 2014-09-15 9:01 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63267 --- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> --- I think GCC's behaviour is allowed by the standard. You do not explicitly instantiate the static member 'Test<int>::out', so the compiler provides an implicit instantiation which is placed at the end of the file, so it is initialized after the variable 'a'. See http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#993 which clarified this result is permitted. ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/63267] Static member of template class is not constructed before it's used. 2014-09-15 8:07 [Bug c++/63267] New: Static member of template class is not constructed before it's used yuxiao1985 at hotmail dot com 2014-09-15 9:01 ` [Bug c++/63267] " redi at gcc dot gnu.org @ 2014-09-17 13:57 ` paolo.carlini at oracle dot com 2021-08-09 19:51 ` pinskia at gcc dot gnu.org 2 siblings, 0 replies; 4+ messages in thread From: paolo.carlini at oracle dot com @ 2014-09-17 13:57 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63267 Paolo Carlini <paolo.carlini at oracle dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- Severity|major |normal ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/63267] Static member of template class is not constructed before it's used. 2014-09-15 8:07 [Bug c++/63267] New: Static member of template class is not constructed before it's used yuxiao1985 at hotmail dot com 2014-09-15 9:01 ` [Bug c++/63267] " redi at gcc dot gnu.org 2014-09-17 13:57 ` paolo.carlini at oracle dot com @ 2021-08-09 19:51 ` pinskia at gcc dot gnu.org 2 siblings, 0 replies; 4+ messages in thread From: pinskia at gcc dot gnu.org @ 2021-08-09 19:51 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63267 --- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> --- ICC and GCC produce the same result while clang produces: Output constructed do it a: 100 Note I noticed if I used std::cout, I get a crash with clang even. ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2021-08-09 19:51 UTC | newest] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2014-09-15 8:07 [Bug c++/63267] New: Static member of template class is not constructed before it's used yuxiao1985 at hotmail dot com 2014-09-15 9:01 ` [Bug c++/63267] " redi at gcc dot gnu.org 2014-09-17 13:57 ` paolo.carlini at oracle dot com 2021-08-09 19:51 ` pinskia at gcc dot gnu.org
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