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-rw-r--r--third_party/nix/src/libexpr/value.hh7
1 files changed, 7 insertions, 0 deletions
diff --git a/third_party/nix/src/libexpr/value.hh b/third_party/nix/src/libexpr/value.hh
index 6bb694d1830b..85ce9e7a1ba0 100644
--- a/third_party/nix/src/libexpr/value.hh
+++ b/third_party/nix/src/libexpr/value.hh
@@ -105,6 +105,13 @@ struct Value {
     NixFloat fpoint;
   };
 
+  Value() : type(tInt), integer(0) {}
+  Value(const Value& copy);
+  Value(Value&& move);
+  ~Value() {}
+  Value& operator=(const Value& copy);
+  Value& operator=(Value&& move);
+
   bool isList() const { return type == tList; }
 
   size_t listSize() const { return list->size(); }