From 5d4beeb5cd7a7d9709d4d46766b0ba32071c5e9f Mon Sep 17 00:00:00 2001
From: Eduard Valeyev <eduard@valeyev.net>
Date: Mon, 12 Jan 2026 16:02:01 -0500
Subject: [PATCH 1/2] fixup libint::any to handle copies of null objects
 correctly

---
 include/libint2/util/any.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/libint2/util/any.h b/include/libint2/util/any.h
index 3df1baa93..e545fab95 100644
--- a/include/libint2/util/any.h
+++ b/include/libint2/util/any.h
@@ -68,7 +68,7 @@ class any {
  public:
   // this is constexpr in the standard
   any() : impl_(nullptr) {}
-  any(const any& other) : impl_(other.impl_->clone()) {}
+  any(const any& other) : impl_(other.impl_ ? other.impl_->clone() : nullptr) {}
   any(any&& other) = default;
   template <typename ValueType,
             typename = detail::disable_if_same_or_derived<any, ValueType> >
@@ -78,7 +78,7 @@ class any {
   ~any() = default;
 
   any& operator=(const any& rhs) {
-    impl_ = decltype(impl_)(rhs.impl_->clone());
+    impl_ = decltype(impl_)(rhs.impl_ ? rhs.impl_->clone() : nullptr);
     return *this;
   }
   any& operator=(any&& rhs) {

From f745471f218d4fe5afbb3c2b6393e875552e3e74 Mon Sep 17 00:00:00 2001
From: Eduard Valeyev <eduard@valeyev.net>
Date: Mon, 12 Jan 2026 16:02:10 -0500
Subject: [PATCH 2/2] always assume std::any is available if C++17 is available

---
 include/libint2/util/any.h | 16 +---------------
 1 file changed, 1 insertion(+), 15 deletions(-)

diff --git a/include/libint2/util/any.h b/include/libint2/util/any.h
index e545fab95..f52ee0acf 100644
--- a/include/libint2/util/any.h
+++ b/include/libint2/util/any.h
@@ -29,23 +29,9 @@
 
 // Include C++17 any header, if available AND functional
 #if __cplusplus >= 201703L
-// macos < 10.14 do not have any_cast in their libc++
-#include <ciso646>  // see https://stackoverflow.com/a/31658120
-#if defined(_LIBCPP_VERSION) && defined(__APPLE__)
-#include <Availability.h>
-#ifdef __MAC_OS_X_VERSION_MIN_ALLOWED
-#if __MAC_OS_X_VERSION_MIN_ALLOWED >= 10140
 #define LIBINT_HAS_CXX17_ANY
-#endif  //  10.14 or later
-#endif  // have macos version
-#else   // libc++ on macos
-#define LIBINT_HAS_CXX17_ANY
-#endif  // libc++ on macos
-#endif  // c++17
-
-#ifdef LIBINT_HAS_CXX17_ANY
 #include <any>
-#endif
+#endif  // c++17
 
 namespace libint2 {