LANG.TYPE.BCVNV : Virtual and Non-Virtual Base Class

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An inheritance hierarchy includes multiple inheritance from an accessible base class B, but some inheritance from B is virtual and some is not.

Class Name

Virtual and Non-Virtual Base Class

Significance

style

Mnemonic

LANG.TYPE.BCVNV

Categories

AUTOSARC++14	AUTOSARC++14:M10-1-1	Classes should not be derived from virtual bases.
	AUTOSARC++14:M10-1-3	An accessible base class shall not be both virtual and non-virtual in the same hierarchy.
MisraC++2008	MisraC++2008:10-1-1	Classes should not be derived from virtual bases.
	MisraC++2008:10-1-3	An accessible base class shall not be both virtual and non-virtual in the same hierarchy.
MisraC++2023	MisraC++2023:13.1.1	Classes should not be inherited virtually
	MisraC++2023:13.1.2	An accessible base class shall not be both virtual and non-virtual in the same hierarchy
JSF++	JSF++:89	A base class shall not be both virtual and non-virtual in the same hierarchy.

Availability

Available for C and C++.

Enabling

Checks for this warning class are disabled by default, and require the unnormalized C ASTs for the project. To enable them, add the following WARNING_FILTER rule and RETAIN_UNNORMALIZED_C_AST specification to the project configuration file.

RETAIN_UNNORMALIZED_C_AST = Yes
WARNING_FILTER += allow class="Virtual and Non-Virtual Base Class"

Note that retaining the unnormalized ASTs will increase the disk space used to store the project representation, and may make the analysis take longer.

class BaseA {};
class Int1: public virtual BaseA {};
class Int2: public BaseA {};
class DerivedX: public Int1, public Int2 {}; // 'Virtual and Non-Virtual Base Class' warning issued here:
                                             //  BaseA is both a virtual and a non-virtual base class

class BaseB {};
class Int3: public virtual BaseB {};
class Int4: public virtual BaseB {};
class DerivedY: public Int3, public Int4 {};                // ok: Int3 and Int4 are non-virtual only; BaseB is virtual only

class BaseC {};
class Int5: public BaseC {};
class Int6: public BaseC {};
class DerivedZ: public Int5, public Int6 {};                // ok: all base classes are non-virtual

If Virtual Base Class checks are enabled, a Virtual Base Class warning will also be issued for every class declaration that has a virtual base class: Int1, Int3, Int4.

The following configuration file parameters affect checks for this warning class.

LANG.TYPE.BCVNV : Virtual and Non-Virtual Base Class

Summary

Properties

Example

Relevant Configuration File Parameters