Fix linux build

endurodave · Dec 30, 2024 · 86c5c07 · 86c5c07
1 parent 635902c
commit 86c5c07
Showing 1 changed file with 4 additions and 4 deletions.
diff --git a/src/Examples/Observer.cpp b/src/Examples/Observer.cpp
@@ -35,8 +35,8 @@ class ConcreteObserverB : public Observer {
 class Subject {
 public:
     virtual ~Subject() = default;
-    virtual void attach(Delegate<void(int)>& observer) = 0;
-    virtual void detach(Delegate<void(int)>& observer) = 0;
+    virtual void attach(const Delegate<void(int)>& observer) = 0;
+    virtual void detach(const Delegate<void(int)>& observer) = 0;
     virtual void notify() = 0;
 };
 
@@ -50,12 +50,12 @@ class ConcreteSubject : public Subject {
     ConcreteSubject(int initialState) : state(initialState) {}
 
     // Attach observer
-    void attach(Delegate<void(int)>& observer) override { 
+    void attach(const Delegate<void(int)>& observer) override { 
         observers += observer;
     }
 
     // Detach observer
-    void detach(Delegate<void(int)>& observer) override {
+    void detach(const Delegate<void(int)>& observer) override {
         observers -= observer;
     }