1 files changed, 8 insertions, 0 deletions
diff --git a/asl/box.hpp b/asl/box.hpp
index d018c03..340a37c 100644
--- a/asl/box.hpp
+++ b/asl/box.hpp
@@ -5,6 +5,7 @@
 #include "asl/annotations.hpp"
 #include "asl/memory.hpp"
 #include "asl/utility.hpp"
+#include "asl/hash.hpp"
 
 namespace asl
 {
@@ -82,6 +83,13 @@ public:
     {
         return m_ptr == nullptr;
     }
+
+    template<typename H>
+    requires hashable<T>
+    friend H AslHashValue(H h, const box& b)
+    {
+        return H::combine(ASL_MOVE(h), *b);
+    }
 };
 
 template<is_object T, allocator Allocator = DefaultAllocator, typename... Args>