https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99433
Bug ID: 99433
Summary: custom friend pipe-operator| conflicts with range
adaptor?
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: gcc-bugs at marehr dot dialup.fu-berlin.de
Target Milestone: ---
Hello gcc-team,
the following code does not compile with gcc-11 any more, but did with gcc-10.
```c++
#include <ranges>
#include <vector>
template <typename underlying_adaptor_t>
struct deep {
underlying_adaptor_t adaptor;
template <typename range_t>
friend auto operator|(range_t &range, deep const &me)
{
return me.adaptor(range[0]);
}
};
inline auto const complement = deep{std::views::transform([](auto const nucl) {
return nucl + ' '; })};
std::vector<std::vector<char>> foo{};
auto v = foo | complement;
```
https://godbolt.org/z/9oEj9T
Thank you!
