[libcxx-commits] [PATCH] D146984: [libc++] Add __decay_t and use it instead of decay<>::type

[Tim Song via Phabricator via libcxx-commits]

tcanens added inline comments.


================
Comment at: libcxx/include/__type_traits/decay.h:73
 #if _LIBCPP_STD_VER >= 14
-template <class _Tp> using decay_t = typename decay<_Tp>::type;
+template <class _Tp> using decay_t = __decay_t<_Tp>;
 #endif
----------------
This change is breaking (and nonconforming). Alias templates are transparent, so this changes the mangling of 

```
template<class T> void f(std::decay_t<T>);
template void f<int>(int);
```

It also breaks declaration matching between that and

```
template<class T> void f(typename std::decay<T>::type);
```


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D146984/new/

https://reviews.llvm.org/D146984