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* [Bug c++/55280] New: Compiler error: Class definition is recognized as function declaration
@ 2012-11-12 6:16 guangmuzhu at gmail dot com
2012-11-12 6:36 ` [Bug c++/55280] " pinskia at gcc dot gnu.org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: guangmuzhu at gmail dot com @ 2012-11-12 6:16 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55280
Bug #: 55280
Summary: Compiler error: Class definition is recognized as
function declaration
Classification: Unclassified
Product: gcc
Version: 4.7.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: guangmuzhu@gmail.com
A and B are both class. If a object is defined by "A a(B());", compiler reports
a is none-class type A(B (*)()).
I guess g++ translates it to "B temp(); A a(b);". If a is defined by "A
a(B(argument));", it's OK. But unfortunately, default constructor is not
allowed to be used like "B temp();", temp is declared as a function.
ps: vs 2008 doesn't have the problem
^ permalink raw reply [flat|nested] 4+ messages in thread* [Bug c++/55280] Compiler error: Class definition is recognized as function declaration 2012-11-12 6:16 [Bug c++/55280] New: Compiler error: Class definition is recognized as function declaration guangmuzhu at gmail dot com @ 2012-11-12 6:36 ` pinskia at gcc dot gnu.org 2012-11-12 9:16 ` redi at gcc dot gnu.org 2012-11-12 9:22 ` guangmuzhu at gmail dot com 2 siblings, 0 replies; 4+ messages in thread From: pinskia at gcc dot gnu.org @ 2012-11-12 6:36 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55280 --- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> 2012-11-12 06:36:20 UTC --- A a(B()); is a function declaration and not a variable declaration. This is one of the ambiguities of the parsing which the C++ standard decided it was a function rather than a variable. ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/55280] Compiler error: Class definition is recognized as function declaration 2012-11-12 6:16 [Bug c++/55280] New: Compiler error: Class definition is recognized as function declaration guangmuzhu at gmail dot com 2012-11-12 6:36 ` [Bug c++/55280] " pinskia at gcc dot gnu.org @ 2012-11-12 9:16 ` redi at gcc dot gnu.org 2012-11-12 9:22 ` guangmuzhu at gmail dot com 2 siblings, 0 replies; 4+ messages in thread From: redi at gcc dot gnu.org @ 2012-11-12 9:16 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55280 Jonathan Wakely <redi at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution| |INVALID --- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-11-12 09:16:39 UTC --- As Andrew said, this is not a bug, see http://en.wikipedia.org/wiki/Most_vexing_parse You can force it to be parsed as a variable declaration with A a((B())) ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/55280] Compiler error: Class definition is recognized as function declaration 2012-11-12 6:16 [Bug c++/55280] New: Compiler error: Class definition is recognized as function declaration guangmuzhu at gmail dot com 2012-11-12 6:36 ` [Bug c++/55280] " pinskia at gcc dot gnu.org 2012-11-12 9:16 ` redi at gcc dot gnu.org @ 2012-11-12 9:22 ` guangmuzhu at gmail dot com 2 siblings, 0 replies; 4+ messages in thread From: guangmuzhu at gmail dot com @ 2012-11-12 9:22 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55280 --- Comment #3 from Guangmu Zhu <guangmuzhu at gmail dot com> 2012-11-12 09:22:01 UTC --- (In reply to comment #2) > As Andrew said, this is not a bug, see > http://en.wikipedia.org/wiki/Most_vexing_parse > > You can force it to be parsed as a variable declaration with A a((B())) I got it. Thanks a lot! ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2012-11-12 9:22 UTC | newest] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2012-11-12 6:16 [Bug c++/55280] New: Compiler error: Class definition is recognized as function declaration guangmuzhu at gmail dot com 2012-11-12 6:36 ` [Bug c++/55280] " pinskia at gcc dot gnu.org 2012-11-12 9:16 ` redi at gcc dot gnu.org 2012-11-12 9:22 ` guangmuzhu at gmail dot com
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