public inbox for gcc-bugs@sourceware.org help / color / mirror / Atom feed
From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/102257] call of overloaded 'tuple' is ambiguous Date: Thu, 09 Sep 2021 17:18:36 +0000 [thread overview] Message-ID: <bug-102257-4-ZxOvYnnOGN@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-102257-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102257 Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- See Also| |https://gcc.gnu.org/bugzill | |a/show_bug.cgi?id=102247 --- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Take: #include <tuple> #include <string> int main() { std::tuple<std::string, int, int> t{{}, 0}; } ----- CUT ---- GCC does reject this though with the following error message: <source>: In function 'int main()': <source>:6:44: error: converting to 'std::allocator_arg_t' from initializer list would use explicit constructor 'constexpr std::allocator_arg_t::allocator_arg_t()' 6 | std::tuple<std::string, int, int> t{{}, 0}; | ^ So the question becomese does the conversion happen while chosing the overload for the tuple constructor? Looks like GCC is the only one which rejects this as being ambiguous too. I did try: struct tag{}; struct alloc {explicit alloc(int){};}; template<typename T1, typename T2> struct tuple { tuple(tag, const alloc&); tuple(const T1&, const T2&); }; class t2{}; tuple<t2,int> tt{{},0}; and GCC accepts this so is suprising based on the error message of the other one. Also you don't need std::string, a simple class like this will fail: #include <tuple> class t2{}; int main() { std::tuple<t2, int> t{{}, 0}; }
next prev parent reply other threads:[~2021-09-09 17:18 UTC|newest] Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-09-09 13:51 [Bug c++/102257] New: " hewillk at gmail dot com 2021-09-09 17:18 ` pinskia at gcc dot gnu.org [this message] 2021-09-09 20:34 ` [Bug c++/102257] " pinskia at gcc dot gnu.org 2021-09-10 3:55 ` hewillk at gmail dot com 2021-09-14 15:31 ` ppalka at gcc dot gnu.org 2024-03-27 13:38 ` redi at gcc dot gnu.org 2024-03-27 13:39 ` redi at gcc dot gnu.org 2024-05-02 9:23 ` redi at gcc dot gnu.org 2024-05-02 9:28 ` redi at gcc dot gnu.org
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=bug-102257-4-ZxOvYnnOGN@http.gcc.gnu.org/bugzilla/ \ --to=gcc-bugzilla@gcc.gnu.org \ --cc=gcc-bugs@gcc.gnu.org \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions for how to clone and mirror all data and code used for this inbox; as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).