https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115215
Bug ID: 115215
Summary: views::concat rejects non-movable references
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: hewillk at gmail dot com
Target Milestone: ---
libstdc++'s views::concat always requires concat_view(rs...) to be well-formed
which does not fully conform with the wording as R does not need to satisfy
concatable when there only one pack:
#include <ranges>
#include <format>
int main() {
auto r = std::views::iota(0, 5)
| std::views::transform([](int) { return
std::format_parse_context{""}; });
auto c = std::views::concat(r); // should be well-formed
}
https://godbolt.org/z/WG5TdsEce
