modernize-use-override

Adds override (introduced in C++11) to overridden virtual functions and removes virtual from those functions as it is not required.

virtual on non base class implementations was used to help indicate to the user that a function was virtual. C++ compilers did not use the presence of this to signify an overridden function.

In C++ 11 override and final keywords were introduced to allow overridden functions to be marked appropriately. Their presence allows compilers to verify that an overridden function correctly overrides a base class implementation.

This can be useful as compilers can generate a compile time error when:

  • The base class implementation function signature changes.
  • The user has not created the override with the correct signature.

Options

IgnoreDestructors

If set to true, this check will not diagnose destructors. Default is false.

AllowOverrideAndFinal

If set to true, this check will not diagnose override as redundant with final. This is useful when code will be compiled by a compiler with warning/error checking flags requiring override explicitly on overridden members, such as gcc -Wsuggest-override/gcc -Werror=suggest-override. Default is false.

OverrideSpelling

Specifies a macro to use instead of override. This is useful when maintaining source code that also needs to compile with a pre-C++11 compiler.

FinalSpelling

Specifies a macro to use instead of final. This is useful when maintaining source code that also needs to compile with a pre-C++11 compiler.

Note

For more information on the use of override see https://en.cppreference.com/w/cpp/language/override