https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100205
Bug ID: 100205
Summary: [11 Regression] error: invalid use of non-static data
member
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: ---
Hi gcc-team,
the following code compiles with gcc-10, but does not compile with gcc-11 any
more:
```cpp
#include <ranges>
struct coordinate_matrix {
using index_t = size_t;
struct convert_to_matrix_coordinate {
index_t column_id;
index_t operator()(index_t) { return column_id; }
};
using iota_view_t = decltype(std::views::iota(0, 1));
index_t column_id;
// does not work
using value_type =
decltype(std::declval<iota_view_t>() |
std::views::transform(convert_to_matrix_coordinate{column_id}));
// does not work
using value_type2 =
decltype(std::views::transform(std::declval<iota_view_t>(),
convert_to_matrix_coordinate{column_id}));
// does work
using value_type3 =
decltype(std::views::transform(std::declval<iota_view_t>(),
([](index_t)
{
return [](index_t) -> index_t
{
return 0;
};
})(column_id)));
// does work
using value_type4 =
decltype(std::views::transform(std::declval<iota_view_t>(),
convert_to_matrix_coordinate{0u}));
// does work
using value_type5 = decltype(column_id);
};
int main()
{
// works:
using index_t = size_t;
auto view = std::views::iota(0, 1);
using iota_view_t = decltype(std::views::iota(0, 1));
index_t column_id = 0;
view |
std::views::transform(coordinate_matrix::convert_to_matrix_coordinate{column_id});
using value_type = decltype(std::declval<iota_view_t>() |
std::views::transform(coordinate_matrix::convert_to_matrix_coordinate{column_id}));
}
```
https://godbolt.org/z/EPoP3jvab
with the following error:
```
<source>:14:97: error: invalid use of non-static data member
'coordinate_matrix::column_id'
14 | decltype(std::declval<iota_view_t>() |
std::views::transform(convert_to_matrix_coordinate{column_id}));
|
^~~~~~~~~
<source>:10:11: note: declared here
10 | index_t column_id;
| ^~~~~~~~~
```
I know how to work around this, but I'm a bit confused why in some cases it
allows using column_id and some cases don't.
Thank you!
