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From: "jason.vas.dias at gmail dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/54348] New: wrong error reported for type mismatch in conditional expression : "error: no match for ternary 'operator?:' in 'false ?" Date: Tue, 21 Aug 2012 19:28:00 -0000 [thread overview] Message-ID: <bug-54348-4@http.gcc.gnu.org/bugzilla/> (raw) http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54348 Bug #: 54348 Summary: wrong error reported for type mismatch in conditional expression : "error: no match for ternary 'operator?:' in 'false ?" Classification: Unclassified Product: gcc Version: 4.6.0 Status: UNCONFIRMED Severity: enhancement Priority: P3 Component: c++ AssignedTo: unassigned@gcc.gnu.org ReportedBy: jason.vas.dias@gmail.com Having made the simple mistake of returning an object of a different type in the '? ( ... )' and ': ( ... )' clauses of a ternary expression , I'd expect and it would be helpful if g++ would emit the "C" error "error: type mismatch in conditional expression" and not "error: no match for ternary 'operator?:' in 'false ? ..." This is extremely confusing, as it suggests that the ternary expression somehow contains an unbalanced number of parentheses or something. This code triggers the issue: <code> #include <string> #include <list> using namespace std; void f() { struct strct { string name, items ;}; list <string> myItems; string myName(""); string as ( ( (&(((strct*)0) -> items)) == (&(((strct*)0) -> name)) ) ? myItems : myName ) ; } </code> Compilation with gcc-4.6.0 & gcc-4.6.3 returns this error: $ g++ -c gxx_bug.cpp gxx_bug.cpp: In function 'void f()': gxx_bug.cpp:12:14: error: no match for ternary 'operator?:' in 'false ? myItems : myName' whereas changing 'list <string> myItems' to 'string myItems' allows compilation to succeed. Shouldn't g++ be complaining about initializing a string with a list<string> rather than this cryptic "no match for ternary 'operator?:'" here ?
next reply other threads:[~2012-08-21 19:28 UTC|newest] Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top 2012-08-21 19:28 jason.vas.dias at gmail dot com [this message] 2012-08-21 19:45 ` [Bug c++/54348] confusing " paolo.carlini at oracle dot com 2012-08-21 19:52 ` redi at gcc dot gnu.org 2012-08-21 20:08 ` paolo.carlini at oracle dot com 2012-08-21 20:24 ` redi at gcc dot gnu.org 2012-08-21 20:27 ` jason.vas.dias at gmail dot com 2012-08-21 20:30 ` jason.vas.dias at gmail dot com 2012-08-21 20:34 ` jason.vas.dias at gmail dot com 2012-08-21 20:52 ` jason.vas.dias at gmail dot com 2012-08-22 7:38 ` redi at gcc dot gnu.org 2014-05-09 18:16 ` jason at gcc dot gnu.org 2014-05-09 18:21 ` jason at gcc dot gnu.org
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