boostorg · demroz · Oct 4, 2025 · Oct 9, 2025 · Oct 9, 2025 · Oct 17, 2025
diff --git a/include/boost/math/differentiation/autodiff_reverse.hpp b/include/boost/math/differentiation/autodiff_reverse.hpp
@@ -580,6 +580,8 @@ class rvar : public expression<RealType, DerivativeOrder, rvar<RealType, Derivat
         }
         it->backward();
     }
+
+    void set_item(RealType value) { value_ = inner_t(value); }
 };
 
 template<typename RealType, size_t DerivativeOrder>
-Original file line number
+Diff line change
@@ Expand Up @@
             }
             it->backward();
         }
+        void set_item(RealType value) { value_ = inner_t(value); }
     };
     template<typename RealType, size_t DerivativeOrder>
@@ Expand Down @@