[libcxx-commits] [libcxx] [libc++] P3016R6: Resolve inconsistencies in begin/end for `valarray` and braced initializer lists (PR #173637)

[Nikolas Klauser via libcxx-commits]

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@@ -32,23 +32,31 @@ _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR _Tp* end(_Tp (&__array)[_Np]) _NOEXCEPT
 #if !defined(_LIBCPP_CXX03_LANG)
 
 template <class _Cp>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 auto begin(_Cp& __c) -> decltype(__c.begin()) {
-  return __c.begin();
+_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 auto begin(_Cp& __c) //
+    noexcept(noexcept(__c.begin()))                                      //
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philnik777 wrote:

We should really have a language feature for "expression-equivalent to ...". This stuff gets worse and worse.

https://github.com/llvm/llvm-project/pull/173637