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From: "akim.demaille at gmail dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/53540] New: C++11: using fails to be equivalent to typedef Date: Thu, 31 May 2012 14:44:00 -0000 [thread overview] Message-ID: <bug-53540-4@http.gcc.gnu.org/bugzilla/> (raw) http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53540 Bug #: 53540 Summary: C++11: using fails to be equivalent to typedef Classification: Unclassified Product: gcc Version: 4.7.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ AssignedTo: unassigned@gcc.gnu.org ReportedBy: akim.demaille@gmail.com Created attachment 27532 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27532 test case Hi all, I hope this is not a bogus bug report, I apologize if there is something I misunderstood. I observed the following with both 4.7.0 and "4.8": g++-mp-4.7 (MacPorts gcc47 4.7.0_3) 4.7.0 Copyright (C) 2012 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. g++-mp-4.8 (MacPorts gcc48 4.8-20120527_1) 4.8.0 20120527 (experimental) Copyright (C) 2012 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. In the following example, I import a type name from a templates struct with "using", and do the same with "typedef". The latter works, but "using" does not seem to find the definition. clang finds it though (but then again, my understanding might be wrong). If "function" is not templated, there is no problem. $ cat foo.cc template <typename T> struct context { typedef int type; }; template <typename T> void function() { using ctx1 = context<T>; typename ctx1::type f1; typedef context<T> ctx2; typename ctx2::type f2; } int main() { function<int>(); } $ g++-mp-4.8 -Wall -std=c++11 foo.cc foo.cc: In instantiation of 'void function() [with T = int]': foo.cc:19:17: required from here foo.cc:11:23: error: no type named 'type' in 'using ctx1 = struct context<T>' typename ctx1::type f1; ^ foo.cc:14:23: warning: unused variable 'f2' [-Wunused-variable] typename ctx2::type f2; ^
next reply other threads:[~2012-05-31 14:39 UTC|newest] Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top 2012-05-31 14:44 akim.demaille at gmail dot com [this message] 2012-05-31 17:43 ` [Bug c++/53540] " redi at gcc dot gnu.org 2012-06-11 17:27 ` akim.demaille at gmail dot com 2012-08-16 19:09 ` dodji at gcc dot gnu.org 2012-08-16 19:11 ` dodji at seketeli dot org 2012-08-16 22:18 ` dodji at seketeli dot org 2012-10-05 21:29 ` paolo.carlini at oracle dot com 2012-10-08 14:27 ` dodji at seketeli dot org 2012-10-10 10:44 ` dodji at gcc dot gnu.org 2012-10-10 10:57 ` dodji at gcc dot gnu.org 2013-05-03 9:54 ` paolo.carlini at oracle dot com
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