| Issue |
143828
|
| Summary |
[libc++] Possibly redundant auto-cast in `<async>`
|
| Labels |
libc++
|
| Assignees |
|
| Reporter |
frederick-vs-ja
|
The uses of `_LIBCPP_AUTO_CAST` (originally introduced in ec0810e1c8e690ebbf571670820392d52fb23b75) seem introducing unnecessary move constructions.
https://github.com/llvm/llvm-project/blob/282e471018d234f78b0990100834532389877519/libcxx/include/future#L1866-L1882
If I understand correctly, auto cast (formerly decay-copy) is already happening when constructing the `tuple` in `__async_func`, so we're probably able to use perfect forwarding in `async` with `__async_func` slightly changed.
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