LANG.TYPE.MI.PBC : Multiple Inheritance with Public Base Class

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CodeSonar^® 9.2p0

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CodeSecure Inc

C and C++

LANG.TYPE.MI.PBC : Multiple Inheritance with Public Base Class

Summary

A class inherits from multiple base classes, and publicly inherits at least one class that is not an interface.

A class C is considered an interface class if either of the following is true.

C has at least one method, and all methods of C are pure virtual, and C has at most one scalar data member.
or
C is inherited as a "mixin" class: an instantiation of a template with at least one parameter that is the inheriting class. This is sometimes referred to as the Curiously Repeating Template Pattern (CRTP).

Properties

Class Name

Multiple Inheritance with Public Base Class

Significance

style

Mnemonic

LANG.TYPE.MI.PBC

Categories

CWE	CWE:1055	Multiple Inheritance from Concrete Classes
JSF++	JSF++:88	Multiple inheritance shall only be allowed in the following restricted form: n interfaces plus m private implementations, plus at most one protected implementation.

Availability

Available for C++ only (not 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="Multiple Inheritance with Public 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.

Example

class base0 {};

class base1 {};

class derA : public base0, public base1 {}; // 'Multiple Inheritance with Public Base Class'
                                            // warning issued here

class derB: public base0 {};                                   // not multiple inheritance

class derC: private base0, private base1 {};                   // not public

Relevant Configuration File Parameters

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

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