| Issue |
155878
|
| Summary |
[libc++] Generalize __three_way_comparator for __make_projected
|
| Labels |
libc++
|
| Assignees |
|
| Reporter |
ldionne
|
`__map_value_compare` is basically an instance of the `on` combinator:
```c++
auto on(func, transform) {
return [](auto ...args) {
return func(invoke(transform, args)...);
};
};
```
I think we have something else that is extremely similar to that called `_ProjectedPred` (via `__make_projected`). I don't think we need to do that right now, but as a follow-up I'd like us to generalize this to use the same mechanism. The goal is for predicates created via `__make_projected` to also be picked up by this optimization, since we use `__make_projected` in many algorithms that use comparisons. That should be done in a separate patch though.
_Originally posted by @ldionne in https://github.com/llvm/llvm-project/pull/155245#discussion_r2307843837_
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