| Issue |
170763
|
| Summary |
Non-portable test for `iter_difference_t<raw_storage_iterator<I, T>>`
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
jwakely
|
https://github.com/llvm/llvm-project/blob/47de55f28438a4a3c3c96157fba66694587d8040/libcxx/test/std/utilities/memory/storage.iterator/types.compile.pass.cpp#L27-L29
In libc++ `raw_storage_iterator` has a non-void `difference_type` in C++20 and later, which is a conforming extension because `raw_storage_iterator` was deprecated in C++17 and removed from C++20, so you can define it however you want.
But the test that checks for that non-standard extension is not portable to other implementations:
```
# | /home/jwakely/src/llvm/llvm-project/libcxx/test/std/utilities/memory/storage.iterator/types.compile.pass.cpp:28:66: error: static assertion failed
# | 28 | static_assert(std::is_same<It::difference_type, std::ptrdiff_t>::value, "");
# | | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~
```
This fails with libstdc++.
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