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* [Bug libstdc++/103924] New: views::join combined with std::string cannot be used in constant expressions
@ 2022-01-06 1:56 hewillk at gmail dot com
2022-01-06 13:46 ` [Bug libstdc++/103924] " ppalka at gcc dot gnu.org
` (4 more replies)
0 siblings, 5 replies; 6+ messages in thread
From: hewillk at gmail dot com @ 2022-01-06 1:56 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103924
Bug ID: 103924
Summary: views::join combined with std::string cannot be used
in constant expressions
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: hewillk at gmail dot com
Target Milestone: ---
The following code cannot be used as a constant expression, but it should work
since constexpr non-propagating-cache and std::string have been implemented.
#include <string>
#include <ranges>
int main() {
using namespace std::string_literals;
static_assert(std::ranges::distance(
std::views::single("42"s) | std::views::join));
}
https://godbolt.org/z/zPv4xnxnP
#include <string>
#include <ranges>
int main() {
using namespace std::string_literals;
static_assert(std::ranges::distance(
std::views::iota(0, 1)
| std::views::transform([](auto) { return "42"s; })
| std::views::join));
}
https://godbolt.org/z/d5TM4x53z
^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug libstdc++/103924] views::join combined with std::string cannot be used in constant expressions 2022-01-06 1:56 [Bug libstdc++/103924] New: views::join combined with std::string cannot be used in constant expressions hewillk at gmail dot com @ 2022-01-06 13:46 ` ppalka at gcc dot gnu.org 2022-10-04 14:41 ` ppalka at gcc dot gnu.org ` (3 subsequent siblings) 4 siblings, 0 replies; 6+ messages in thread From: ppalka at gcc dot gnu.org @ 2022-01-06 13:46 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103924 Patrick Palka <ppalka at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Ever confirmed|0 |1 Last reconfirmed| |2022-01-06 Status|UNCONFIRMED |NEW CC| |ppalka at gcc dot gnu.org ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug libstdc++/103924] views::join combined with std::string cannot be used in constant expressions 2022-01-06 1:56 [Bug libstdc++/103924] New: views::join combined with std::string cannot be used in constant expressions hewillk at gmail dot com 2022-01-06 13:46 ` [Bug libstdc++/103924] " ppalka at gcc dot gnu.org @ 2022-10-04 14:41 ` ppalka at gcc dot gnu.org 2024-03-29 21:20 ` ppalka at gcc dot gnu.org ` (2 subsequent siblings) 4 siblings, 0 replies; 6+ messages in thread From: ppalka at gcc dot gnu.org @ 2022-10-04 14:41 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103924 --- Comment #1 from Patrick Palka <ppalka at gcc dot gnu.org> --- I encountered a similar problem when testing views::join_with: #include <string> #include <ranges> constexpr std::string_view rs[] = {"42"}; static_assert(!std::ranges::empty(rs | std::views::join_with(std::string("")))); error: accessing ‘std::__cxx11::basic_string<char>::<unnamed union>::_M_allocated_capacity’ member instead of initialized ‘std::__cxx11::basic_string<char>::<unnamed union>::_M_local_buf’ member in constant expression ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug libstdc++/103924] views::join combined with std::string cannot be used in constant expressions 2022-01-06 1:56 [Bug libstdc++/103924] New: views::join combined with std::string cannot be used in constant expressions hewillk at gmail dot com 2022-01-06 13:46 ` [Bug libstdc++/103924] " ppalka at gcc dot gnu.org 2022-10-04 14:41 ` ppalka at gcc dot gnu.org @ 2024-03-29 21:20 ` ppalka at gcc dot gnu.org 2024-03-29 21:21 ` ppalka at gcc dot gnu.org 2024-03-30 1:13 ` hewillk at gmail dot com 4 siblings, 0 replies; 6+ messages in thread From: ppalka at gcc dot gnu.org @ 2024-03-29 21:20 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103924 --- Comment #2 from Patrick Palka <ppalka at gcc dot gnu.org> --- *** Bug 114530 has been marked as a duplicate of this bug. *** ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug libstdc++/103924] views::join combined with std::string cannot be used in constant expressions 2022-01-06 1:56 [Bug libstdc++/103924] New: views::join combined with std::string cannot be used in constant expressions hewillk at gmail dot com ` (2 preceding siblings ...) 2024-03-29 21:20 ` ppalka at gcc dot gnu.org @ 2024-03-29 21:21 ` ppalka at gcc dot gnu.org 2024-03-30 1:13 ` hewillk at gmail dot com 4 siblings, 0 replies; 6+ messages in thread From: ppalka at gcc dot gnu.org @ 2024-03-29 21:21 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103924 --- Comment #3 from Patrick Palka <ppalka at gcc dot gnu.org> --- From PR114530: #include <ranges> #include <vector> static_assert( std::ranges::distance( std::views::single(std::views::cartesian_product(std::string{})) | std::views::join ) == 0 ); ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug libstdc++/103924] views::join combined with std::string cannot be used in constant expressions 2022-01-06 1:56 [Bug libstdc++/103924] New: views::join combined with std::string cannot be used in constant expressions hewillk at gmail dot com ` (3 preceding siblings ...) 2024-03-29 21:21 ` ppalka at gcc dot gnu.org @ 2024-03-30 1:13 ` hewillk at gmail dot com 4 siblings, 0 replies; 6+ messages in thread From: hewillk at gmail dot com @ 2024-03-30 1:13 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103924 --- Comment #4 from 康桓瑋 <hewillk at gmail dot com> --- (In reply to Patrick Palka from comment #2) > *** Bug 114530 has been marked as a duplicate of this bug. *** That's my lost memory. ^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2024-03-30 1:13 UTC | newest] Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2022-01-06 1:56 [Bug libstdc++/103924] New: views::join combined with std::string cannot be used in constant expressions hewillk at gmail dot com 2022-01-06 13:46 ` [Bug libstdc++/103924] " ppalka at gcc dot gnu.org 2022-10-04 14:41 ` ppalka at gcc dot gnu.org 2024-03-29 21:20 ` ppalka at gcc dot gnu.org 2024-03-29 21:21 ` ppalka at gcc dot gnu.org 2024-03-30 1:13 ` hewillk at gmail dot com
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