added [[nodiscard]]

Tree.h

@@ -7,7 +7,7 @@
 
 struct Node
 {
-    std::shared_ptr<Person> person;
+    std::shared_ptr<Person> person{};
     std::shared_ptr<Node> left{};
     std::shared_ptr<Node> right{};
 };
@@ -18,16 +18,16 @@ public:
     void printTree();
     void insert(std::shared_ptr<Person> &person, std::shared_ptr<Node> &node);
 
-    std::shared_ptr<Node> &getRoot();
+    [[nodiscard]] std::shared_ptr<Node> &getRoot();
     void setRoot(const std::shared_ptr<Node> &newRoot);
-    int height(std::shared_ptr<Node> &node);
+    [[nodiscard]] int height(std::shared_ptr<Node> &node);
 
-    bool isBalanced();
+    [[nodiscard]] bool isBalanced();
 
 private:
     std::shared_ptr<Node> root = nullptr;
     void printTree(const std::string &prefix, std::shared_ptr<Node> &node, bool isLeft);
-    bool isBalanced(std::shared_ptr<Node> &node);
+    [[nodiscard]] bool isBalanced(std::shared_ptr<Node> &node);
 };
 
 #endif //TREE_H

fitnesscenter.h

@@ -37,7 +37,7 @@ public:
     void loadFile(const std::string &path);
 
     //getter setter
-    std::list<std::shared_ptr<Person>> &getRegistered();
+    [[nodiscard]] std::list<std::shared_ptr<Person>> &getRegistered();
     void setRegistered(const std::list<std::shared_ptr<Person>> &newRegistered);
 
     [[nodiscard]] Tree &getTreeData();

person.h

@@ -24,7 +24,7 @@ public:
     [[nodiscard]] bool operator<(std::shared_ptr<Person> &other) const;
     friend bool operator<(std::shared_ptr<Person> &lhs, std::shared_ptr<Person> &rhs);
 
-    int idToInt() const;
+    [[nodiscard]] int idToInt() const;
 
     //getter setter
     [[nodiscard]] std::string getName() const;