[libcxx-commits] [libcxx] [libc++] Fix missing 'get_new_handler()' for Windows builds (PR #150182)

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siradam7th wrote:

> > The following PR fixes the missing `get_new_handler()` function for Windows by using the same implementation as other platforms since `<new.h>` in the UCRT is missing this function and only defines `set_new_handler()`
> 
> `<new.h>` in the UCRT not only contains `_set_new_handler()` it also contains `_query_new_handler()` which returns a pointer to the current new handler. Isn't it possible to use that function instead of maintaining your own implementation?

- `_query_new_handler()` returns a function pointer of type `_PNH` which has a different signature than what we need, so you'd need to wrap it inside another function that has the correct signature, which then calls the actual function, we already have to do that for `_set_new_handler()`.
- that is not how the STL implements it currently, I'm trying to keep it similar to their implementation.


https://github.com/llvm/llvm-project/pull/150182