[libcxx-commits] [libcxx] [libc++] P3798R1: The unexpected in std::expected (PR #204826)

[A. Jiang via libcxx-commits]

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@@ -1599,6 +1603,10 @@ class expected<_Tp, _Err> : private __expected_void_base<_Err> {
 
   [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool has_value() const noexcept { return this->__has_val(); }
 
+#  if _LIBCPP_STD_VER >= 29 
+  [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool has_error() const noexcept { return !this->has_value(); }
+#  endif
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frederick-vs-ja wrote:

```suggestion
  [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool has_error() const noexcept { return !this->has_value(); }
```

https://github.com/llvm/llvm-project/pull/204826