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* [Bug c++/58119] New: Invalid ambiguous default type conversion with only a single invalid conversion listed. @ 2013-08-10 12:42 tilps at hotmail dot com 2013-08-10 17:39 ` [Bug c++/58119] [4.7/4.8/4.9 Regression] " paolo.carlini at oracle dot com ` (3 more replies) 0 siblings, 4 replies; 5+ messages in thread From: tilps at hotmail dot com @ 2013-08-10 12:42 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58119 Bug ID: 58119 Summary: Invalid ambiguous default type conversion with only a single invalid conversion listed. Product: gcc Version: 4.8.1 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: tilps at hotmail dot com 'Minimal' test case: template <class type> class Silly { public: Silly(type *value) { data_ = value; } operator type*() const { return data_; } template <class other> operator Silly<other>() const { return Silly<other>(data_); } private: type *data_; }; int main() { Silly<int> a(nullptr); delete a; } Fails giving: test.cc:20:10: error: ambiguous default type conversion from 'Silly<int>' delete a; ^ test.cc:20:10: error: candidate conversions include 'template<class other> Silly<type>::operator Silly<other>() const [with other = other; type = int]' test.cc:20:10: error: type 'class Silly<int>' argument given to 'delete', expected pointer I believe that this code should be considered valid, the only valid type conversion is via the operator type *() which then converts to void* for the delete operator. I don't see any way that Silly<anything> could be considered convertible, except via operator type *() - and as far as I was aware, only a single implicit cast operator is allowed to be considered in a type conversion chain. Interestingly, the valid type conversion is not mentioned as a candidate, and the candidate mentioned does not specify which template parameter type it would use for the 'other' template parameter. Ultimately this is a bit of a strange example - I was trying to resurrect some legacy code with a particularly dumb (but heavily used) 'smart pointer' type. But this code did work, at least as recently as 4.6 - and probably back before 3.2. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/58119] [4.7/4.8/4.9 Regression] Invalid ambiguous default type conversion with only a single invalid conversion listed. 2013-08-10 12:42 [Bug c++/58119] New: Invalid ambiguous default type conversion with only a single invalid conversion listed tilps at hotmail dot com @ 2013-08-10 17:39 ` paolo.carlini at oracle dot com 2013-08-16 13:49 ` jakub at gcc dot gnu.org ` (2 subsequent siblings) 3 siblings, 0 replies; 5+ messages in thread From: paolo.carlini at oracle dot com @ 2013-08-10 17:39 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58119 Paolo Carlini <paolo.carlini at oracle dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Last reconfirmed| |2013-08-10 CC| |jason at gcc dot gnu.org Summary|Invalid ambiguous default |[4.7/4.8/4.9 Regression] |type conversion with only a |Invalid ambiguous default |single invalid conversion |type conversion with only a |listed. |single invalid conversion | |listed. Ever confirmed|0 |1 --- Comment #1 from Paolo Carlini <paolo.carlini at oracle dot com> --- I'm marking this as Regression because 4.6.x accepted it (likewise current clang and icc) ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/58119] [4.7/4.8/4.9 Regression] Invalid ambiguous default type conversion with only a single invalid conversion listed. 2013-08-10 12:42 [Bug c++/58119] New: Invalid ambiguous default type conversion with only a single invalid conversion listed tilps at hotmail dot com 2013-08-10 17:39 ` [Bug c++/58119] [4.7/4.8/4.9 Regression] " paolo.carlini at oracle dot com @ 2013-08-16 13:49 ` jakub at gcc dot gnu.org 2013-08-18 5:20 ` jason at gcc dot gnu.org 2013-08-20 13:00 ` jason at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: jakub at gcc dot gnu.org @ 2013-08-16 13:49 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58119 Jakub Jelinek <jakub at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |jakub at gcc dot gnu.org Target Milestone|--- |4.7.4 ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/58119] [4.7/4.8/4.9 Regression] Invalid ambiguous default type conversion with only a single invalid conversion listed. 2013-08-10 12:42 [Bug c++/58119] New: Invalid ambiguous default type conversion with only a single invalid conversion listed tilps at hotmail dot com 2013-08-10 17:39 ` [Bug c++/58119] [4.7/4.8/4.9 Regression] " paolo.carlini at oracle dot com 2013-08-16 13:49 ` jakub at gcc dot gnu.org @ 2013-08-18 5:20 ` jason at gcc dot gnu.org 2013-08-20 13:00 ` jason at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: jason at gcc dot gnu.org @ 2013-08-18 5:20 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58119 Jason Merrill <jason at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |ASSIGNED Assignee|unassigned at gcc dot gnu.org |jason at gcc dot gnu.org ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/58119] [4.7/4.8/4.9 Regression] Invalid ambiguous default type conversion with only a single invalid conversion listed. 2013-08-10 12:42 [Bug c++/58119] New: Invalid ambiguous default type conversion with only a single invalid conversion listed tilps at hotmail dot com ` (2 preceding siblings ...) 2013-08-18 5:20 ` jason at gcc dot gnu.org @ 2013-08-20 13:00 ` jason at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: jason at gcc dot gnu.org @ 2013-08-20 13:00 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58119 Jason Merrill <jason at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|ASSIGNED |RESOLVED Resolution|--- |FIXED --- Comment #2 from Jason Merrill <jason at gcc dot gnu.org> --- Fixed for trunk, 4.7, 4.8 in r201880, r201881, r201882. ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2013-08-20 13:00 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2013-08-10 12:42 [Bug c++/58119] New: Invalid ambiguous default type conversion with only a single invalid conversion listed tilps at hotmail dot com 2013-08-10 17:39 ` [Bug c++/58119] [4.7/4.8/4.9 Regression] " paolo.carlini at oracle dot com 2013-08-16 13:49 ` jakub at gcc dot gnu.org 2013-08-18 5:20 ` jason at gcc dot gnu.org 2013-08-20 13:00 ` jason at gcc dot gnu.org
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