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V1052. Declaring virtual methods in a c…
Analyzer diagnostics
General Analysis (C++)
General Analysis (C#)
General Analysis (Java)
Diagnosis of micro-optimizations (C++)
Diagnosis of 64-bit errors (Viva64, C++)
MISRA errors
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Additional information
Contents

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

Feb 25 2020

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();
};
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