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* [Bug c++/112632] New: [14 Regression]  Non-type template parameter created with converting constructor sometimes has original type
@ 2023-11-20  5:08 pinskia at gcc dot gnu.org
  2023-11-20  5:08 ` [Bug c++/112632] " pinskia at gcc dot gnu.org
                   ` (5 more replies)
  0 siblings, 6 replies; 7+ messages in thread
From: pinskia at gcc dot gnu.org @ 2023-11-20  5:08 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112632

            Bug ID: 112632
           Summary: [14 Regression]  Non-type template parameter created
                    with converting constructor sometimes has original
                    type
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Keywords: needs-bisection, rejects-valid
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
  Target Milestone: ---

Take:
```
    template<typename T>
    inline constexpr bool C = true;

    struct n {
        constexpr n(int a) : i(a) {}
        int i;
    };

    template<n N>
    using get_n_i_type = decltype(N.i);

    template<int X>
    int f() {
        using iii = get_n_i_type<X>;
    #if 1  // Change to 0 and this compiles
        static_assert(C<iii>);
    #endif
        return iii{};
    }

    template int f<3>();
```

This is rejected on the trunk with:
```
<source>: In instantiation of 'int f() [with int X = 3]':
<source>:22:23:   required from here
   22 |     template int f<3>();
      |                       ^
<source>:11:37: error: request for member 'i' in '3', which is of non-class
type 'int'
   11 |     using get_n_i_type = decltype(N.i);
      |                                   ~~^
```

But was accepted in GCC 13.  Note the difference between this and PR 112594 is
that C here is declared an `inline constexpr` rather than a concept.

^ permalink raw reply	[flat|nested] 7+ messages in thread
end of thread, other threads:[~2024-01-19 18:37 UTC | newest]

Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2023-11-20  5:08 [Bug c++/112632] New: [14 Regression] Non-type template parameter created with converting constructor sometimes has original type pinskia at gcc dot gnu.org
2023-11-20  5:08 ` [Bug c++/112632] " pinskia at gcc dot gnu.org
2023-11-20 14:32 ` ppalka at gcc dot gnu.org
2024-01-10 13:45 ` rguenth at gcc dot gnu.org
2024-01-17 22:07 ` jason at gcc dot gnu.org
2024-01-19 18:35 ` cvs-commit at gcc dot gnu.org
2024-01-19 18:37 ` jason at gcc dot gnu.org

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