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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/52288] Trouble with operator?: and lambdas Date: Thu, 16 Feb 2012 23:55:00 -0000 [thread overview] Message-ID: <bug-52288-4-3wzuixgQr0@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-52288-4@http.gcc.gnu.org/bugzilla/> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52288 Jonathan Wakely <redi at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Keywords| |diagnostic Severity|normal |enhancement --- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-02-16 23:49:39 UTC --- (In reply to comment #0) > This code: > > int main(int argc, char** argv) { > bool b; > void* p = b ? [argc](int i){ return i; } : > [argc](int i){ return i; }; > return 0; } > > gets you this: > > s3:~/ootbc/personal/ivan$ g++ --std=c++0x foo.cc > foo.cc: In function âint main(int, char**)â: > foo.cc:5:28: error: no match for ternary âoperator?:â in âb ? {argc} : {argc}â > > which is a poor. What do you suggest instead? > Meanwhile this code: > > int main(int argc, char** argv) { > bool b; > void* p = b ? &[argc](int i){ return i; } : > &[argc](int i){ return i; }; > return 0; } > > gets you this: > > s3:~/ootbc/personal/ivan$ g++ --std=c++0x foo.cc > foo.cc: In function âint main(int, char**)â: > foo.cc:4:42: error: taking address of temporary [-fpermissive] > foo.cc:5:29: error: taking address of temporary [-fpermissive] > foo.cc:5:29: error: conditional expression between distinct pointer types > âmain(int, char**)::<lambda(int)>*â and âmain(int, char**)::<lambda(int)>*â > lacks a cast > > which is even worse. Why? It's entirely accurate, you can't take the address of a lambda, and the two types are different and incompatible so can't be used as the second and third operands of a conditional expression.
next prev parent reply other threads:[~2012-02-16 23:51 UTC|newest] Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top 2012-02-16 23:12 [Bug c++/52288] New: " igodard at pacbell dot net 2012-02-16 23:55 ` redi at gcc dot gnu.org [this message] 2012-02-17 0:01 ` [Bug c++/52288] " redi at gcc dot gnu.org 2012-02-17 0:14 ` igodard at pacbell dot net 2012-02-17 0:27 ` redi at gcc dot gnu.org 2012-02-17 0:41 ` manu at gcc dot gnu.org 2014-05-09 18:29 ` jason at gcc dot gnu.org 2021-08-06 3:27 ` [Bug c++/52288] operator?: and lambdas error message could be better pinskia at gcc dot gnu.org 2021-08-06 9:18 ` redi at gcc dot gnu.org
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