Fix clang-tidy warning after upgrading to clang-tidy-15

src/class_diagram/model/class.cc

@@ -126,7 +126,7 @@ int class_::calculate_template_specialization_match(
 {
     int res{};
 
-    std::string left = name_and_ns();
+    const std::string left = name_and_ns();
     // TODO: handle variadic templates
     if ((name_and_ns() != full_name) ||
         (templates().size() != other.templates().size())) {

src/class_diagram/model/class_element.h

@@ -32,6 +32,8 @@ public:
     class_element(
         common::model::access_t scope, std::string name, std::string type);
 
+    virtual ~class_element() = default;
+
     common::model::access_t access() const;
     std::string name() const;
     std::string type() const;

src/class_diagram/model/class_member.h

@@ -28,7 +28,7 @@ public:
     class_member(common::model::access_t access, const std::string &name,
         const std::string &type);
 
-    virtual ~class_member() = default;
+    ~class_member() override = default;
 
     bool is_relationship() const;
     void is_relationship(bool is_relationship);

src/class_diagram/model/class_method.h

@@ -34,7 +34,7 @@ public:
     class_method(common::model::access_t access, const std::string &name,
         const std::string &type);
 
-    virtual ~class_method() = default;
+    ~class_method() override = default;
 
     bool is_pure_virtual() const;
     void is_pure_virtual(bool is_pure_virtual);