philnik777 wrote:
Sorry for coming in so late, but can't this already be implemented without any
new machinery?
```c++
template <class T>
constexpr int addresspace = [] { static_assert(__is_pointer(T)); return 0; }();
template <class T, int N>
constexpr int addresspace<T [[clang::address_space(N)]]> = N;
#define addrspaceof(...) addresspace<decltype(__VA_ARGS__)>
```
Or is the main motivation here to have it for C?
https://github.com/llvm/llvm-project/pull/210242
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