[Bug libstdc++/103924] views::join combined with std::string cannot be used in constant expressions

[hewillk at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103924

--- Comment #4 from 康桓瑋  ---
(In reply to Patrick Palka from comment #2)
> *** Bug 114530 has been marked as a duplicate of this bug. ***

That's my lost memory.

[Bug libstdc++/103924] views::join combined with std::string cannot be used in constant expressions

[ppalka at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103924

--- Comment #3 from Patrick Palka  ---
>From PR114530:

#include 
#include 

static_assert(
  std::ranges::distance(
  std::views::single(std::views::cartesian_product(std::string{}))
| std::views::join
  ) == 0
);

[Bug libstdc++/103924] views::join combined with std::string cannot be used in constant expressions

[ppalka at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103924

--- Comment #2 from Patrick Palka  ---
*** Bug 114530 has been marked as a duplicate of this bug. ***

[Bug libstdc++/103924] views::join combined with std::string cannot be used in constant expressions

[ppalka at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103924

--- Comment #1 from Patrick Palka  ---
I encountered a similar problem when testing views::join_with:

#include 
#include 
constexpr std::string_view rs[] = {"42"};
static_assert(!std::ranges::empty(rs |
std::views::join_with(std::string("";

error: accessing ‘std::__cxx11::basic_string_M_allocated_capacity’ member instead of initialized
‘std::__cxx11::basic_string_M_local_buf’ member in
constant expression

[Bug libstdc++/103924] views::join combined with std::string cannot be used in constant expressions

[ppalka at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103924

Patrick Palka  changed:

   What|Removed |Added

 Ever confirmed|0   |1
   Last reconfirmed||2022-01-06
 Status|UNCONFIRMED |NEW
 CC||ppalka at gcc dot gnu.org