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* [Bug c++/50157] New: [C++0x] Non-silent SFINAE in new expression with explicit conversion
@ 2011-08-22 19:19 daniel.kruegler at googlemail dot com
2011-08-25 18:24 ` [Bug c++/50157] " jason at gcc dot gnu.org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: daniel.kruegler at googlemail dot com @ 2011-08-22 19:19 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50157
Bug #: 50157
Summary: [C++0x] Non-silent SFINAE in new expression with
explicit conversion
Classification: Unclassified
Product: gcc
Version: 4.7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: daniel.kruegler@googlemail.com
CC: jason@redhat.com
Build: 4.7.0 20110813 (experimental)
gcc 4.7.0 20110813 (experimental) in C++0x mode rejects the following code:
---
template<class T>
T val();
template<class T, class Arg, class =
decltype(::new T(val<Arg>()))
>
auto test(int) -> char;
template<class, class>
auto test(...) -> char (&)[2];
struct P {
explicit operator bool(); // (#13)
};
typedef decltype(test<bool, P>(0)) type; // OK
typedef decltype(test<float, P>(0)) type2; // Error (#17)
---
"17|error: invalid user-defined conversion from 'P' to 'float' [-fpermissive]|
13|note: candidate is: P::operator bool() <near match>|
13|note: return type 'bool' of explicit conversion function cannot be
converted to 'float' with a qualification conversion|
17|error: invalid user-defined conversion from 'P' to 'float' [-fpermissive]|
13|note: candidate is: P::operator bool() <near match>|
13|note: return type 'bool' of explicit conversion function cannot be
converted to 'float' with a qualification conversion|
||=== Build finished: 6 errors, 0 warnings ===|"
It is correct, that the P->float conversion would be ill-formed, but this needs
to be handled silently and the program should be accepted. The compiler seems
to have a special problem here with the combination of an explicit conversion
function in P and the otherwise feasible bool->float conversion in implicit
contexts.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/50157] [C++0x] Non-silent SFINAE in new expression with explicit conversion 2011-08-22 19:19 [Bug c++/50157] New: [C++0x] Non-silent SFINAE in new expression with explicit conversion daniel.kruegler at googlemail dot com @ 2011-08-25 18:24 ` jason at gcc dot gnu.org 2011-08-25 18:30 ` jason at gcc dot gnu.org 2011-08-25 18:58 ` jason at gcc dot gnu.org 2 siblings, 0 replies; 4+ messages in thread From: jason at gcc dot gnu.org @ 2011-08-25 18:24 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50157 --- Comment #2 from Jason Merrill <jason at gcc dot gnu.org> 2011-08-25 18:22:49 UTC --- Author: jason Date: Thu Aug 25 18:22:46 2011 New Revision: 178081 URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=178081 Log: PR c++/50157 * call.c (convert_like_real): Exit early if bad and !tf_error. Added: trunk/gcc/testsuite/g++.dg/cpp0x/sfinae27.C Modified: trunk/gcc/cp/ChangeLog trunk/gcc/cp/call.c trunk/gcc/testsuite/ChangeLog ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/50157] [C++0x] Non-silent SFINAE in new expression with explicit conversion 2011-08-22 19:19 [Bug c++/50157] New: [C++0x] Non-silent SFINAE in new expression with explicit conversion daniel.kruegler at googlemail dot com 2011-08-25 18:24 ` [Bug c++/50157] " jason at gcc dot gnu.org @ 2011-08-25 18:30 ` jason at gcc dot gnu.org 2011-08-25 18:58 ` jason at gcc dot gnu.org 2 siblings, 0 replies; 4+ messages in thread From: jason at gcc dot gnu.org @ 2011-08-25 18:30 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50157 --- Comment #1 from Jason Merrill <jason at gcc dot gnu.org> 2011-08-25 18:22:36 UTC --- Author: jason Date: Thu Aug 25 18:22:33 2011 New Revision: 178080 URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=178080 Log: PR c++/50157 * call.c (convert_like_real): Exit early if bad and !tf_error. Added: branches/gcc-4_6-branch/gcc/testsuite/g++.dg/cpp0x/sfinae27.C Modified: branches/gcc-4_6-branch/gcc/cp/ChangeLog branches/gcc-4_6-branch/gcc/cp/call.c branches/gcc-4_6-branch/gcc/testsuite/ChangeLog ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/50157] [C++0x] Non-silent SFINAE in new expression with explicit conversion 2011-08-22 19:19 [Bug c++/50157] New: [C++0x] Non-silent SFINAE in new expression with explicit conversion daniel.kruegler at googlemail dot com 2011-08-25 18:24 ` [Bug c++/50157] " jason at gcc dot gnu.org 2011-08-25 18:30 ` jason at gcc dot gnu.org @ 2011-08-25 18:58 ` jason at gcc dot gnu.org 2 siblings, 0 replies; 4+ messages in thread From: jason at gcc dot gnu.org @ 2011-08-25 18:58 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50157 Jason Merrill <jason at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED CC| |jason at gcc dot gnu.org Resolution| |FIXED AssignedTo|unassigned at gcc dot |jason at gcc dot gnu.org |gnu.org | Target Milestone|--- |4.6.2 --- Comment #3 from Jason Merrill <jason at gcc dot gnu.org> 2011-08-25 18:53:01 UTC --- Fixed for 4.6.2. ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2011-08-25 18:54 UTC | newest] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2011-08-22 19:19 [Bug c++/50157] New: [C++0x] Non-silent SFINAE in new expression with explicit conversion daniel.kruegler at googlemail dot com 2011-08-25 18:24 ` [Bug c++/50157] " jason at gcc dot gnu.org 2011-08-25 18:30 ` jason at gcc dot gnu.org 2011-08-25 18:58 ` jason at gcc dot gnu.org
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