# V1052. Declaring virtual methods in a class marked as 'final' is pointless.

The analyzer has detected a virtual method in a class marked as 'final'.

After refactoring or due to poor class design, you may have a class declared as 'final', while it still contains non-overridden virtual methods.

Such class structure has no practical use, so it is recommended that you check if the class' inheritance logic is intact. In addition, creating such a class results in having to store an extra pointer to the virtual method table and performance drop.

The following example class will trigger the warning:

    struct Cl final // <= V1052
    {
      virtual ~Cl() {}
    };

    struct BaseClass
    {
      virtual void foo(int);
    };

    struct DerivedClass final : BaseClass // <= V1052
    {
      virtual void bar(float);
    };

If the virtual method / destructor of the final class overrides the virtual method / destructor of the base class, no warning will be issued:

    struct BaseClass
    {
      virtual void foo();
      virtual ~BaseClass();
    };

    struct DerivedClass final : BaseClass // ok
    {
      virtual void foo() override;
      virtual ~DerivedClass();
    };