| Issue |
63443
|
| Summary |
`offsetof()` doesn't support `::` in member names
|
| Labels |
|
| Assignees |
|
| Reporter |
HolyBlackCat
|
I'm not sure what the standard has to say about it, but GCC and MSVC accept it, and it can be a useful feature.
E.g. GCC and MSVC accept following code:
```cpp
#include <cstddef>
#include <iostream>
struct Empty {};
#define FOO [[no_unique_address]] Empty e;
struct A
{
FOO int x;
};
struct B
{
FOO int y;
};
struct C : A, B
{
FOO int z;
};
template <typename D, typename B>
constexpr std::size_t base_offset = offsetof(D, B::e);
int main()
{
std::cout << base_offset<C, A> << '\n'; // 0
std::cout << base_offset<C, B> << '\n'; // 4
std::cout << base_offset<C, C> << '\n'; // 8
}
```
While Clang trunk says:
```none
<source>:24:50: error: expected ')'
24 | constexpr std::size_t base_offset = offsetof(D, B::e);
| ^
```
![]()
_______________________________________________
llvm-bugs mailing list
[email protected]
https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-bugs
