[libcxx-commits] [libcxx] [libc++][math] Implement C++23 (parts of) P0533: constexpr `std::div()` (PR #104633)

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PaulXiCao wrote:

> since this doesn't work when calling the functions without qualifiers and breaks `using namespace std;`

AFAIK This is a general issue if one mangles two functions with different behavior from different namespaces with the same name (e.g. `::div()` and `std::div()`). Is it a requirement that this works?

One could argue that `::div()` is the C version (aka runtime only), and its `constexpr` pendant is available via `std::div()`.

https://github.com/llvm/llvm-project/pull/104633