[libcxx-commits] [libcxx] [libc++][optional][NFC] Use variable templates instead of class templates (PR #212443)

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git-clang-format --diff origin/main HEAD --extensions  -- libcxx/include/optional --diff_from_common_commit
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``````````diff
diff --git a/libcxx/include/optional b/libcxx/include/optional
index fa7fab80c..2acd49653 100644
--- a/libcxx/include/optional
+++ b/libcxx/include/optional
@@ -1094,8 +1094,8 @@ public:
   template <class _Func>
   [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto and_then(_Func&& __f) & {
     using _Up = invoke_result_t<_Func, _Tp&>;
-    static_assert(__is_std_optional_v<remove_cvref_t<_Up>>,
-                  "Result of f(value()) must be a specialization of std::optional");
+    static_assert(
+        __is_std_optional_v<remove_cvref_t<_Up>>, "Result of f(value()) must be a specialization of std::optional");
     if (*this)
       return std::invoke(std::forward<_Func>(__f), value());
     return remove_cvref_t<_Up>();
@@ -1104,8 +1104,8 @@ public:
   template <class _Func>
   [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto and_then(_Func&& __f) const& {
     using _Up = invoke_result_t<_Func, const _Tp&>;
-    static_assert(__is_std_optional_v<remove_cvref_t<_Up>>,
-                  "Result of f(value()) must be a specialization of std::optional");
+    static_assert(
+        __is_std_optional_v<remove_cvref_t<_Up>>, "Result of f(value()) must be a specialization of std::optional");
     if (*this)
       return std::invoke(std::forward<_Func>(__f), value());
     return remove_cvref_t<_Up>();
@@ -1339,8 +1339,8 @@ public:
   template <class _Func>
   [[nodiscard]] constexpr auto and_then(_Func&& __f) const {
     using _Up = invoke_result_t<_Func, _Tp&>;
-    static_assert(__is_std_optional_v<remove_cvref_t<_Up>>,
-                  "Result of f(value()) must be a specialization of std::optional");
+    static_assert(
+        __is_std_optional_v<remove_cvref_t<_Up>>, "Result of f(value()) must be a specialization of std::optional");
     if (*this)
       return std::invoke(std::forward<_Func>(__f), value());
     return remove_cvref_t<_Up>();

``````````

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https://github.com/llvm/llvm-project/pull/212443