LANG.FUNCS.DEFAULT.OVERRIDE : Method Default Value Mismatch

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An overriding virtual function specifies a default parameter value, but the parameter has a different default value in a base class.

Class Name

Method Default Value Mismatch

Significance

style

Mnemonic

LANG.FUNCS.DEFAULT.OVERRIDE

Categories

AUTOSARC++14	AUTOSARC++14:M8-3-1	Parameters in an overriding virtual function shall either use the same default arguments as the function they override, or else shall not specify any default arguments.
MisraC++2008	MisraC++2008:8-3-1	Parameters in an overriding virtual function shall either use the same default arguments as the function they override, or else shall not specify any default arguments.
MisraC++2023	MisraC++2023:13.3.2	Parameters in an overriding virtual function shall not introduce different default arguments
JSF++	JSF++:95	An inherited default parameter shall never be redefined.

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="Method Default Value Mismatch"

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 BaseClass {

  void f(int x=1) {}

  virtual void h1(int x)   {}
  virtual void h2(int x=1) {}
  virtual void h3(int x=1) {}
  virtual void h4(int x=1) {}
};


class DerivedClass : BaseClass {
  void g(int x=0) {}                  // ok: not overriding

  void f(int x=2) {}                  // ok: not virtual

  void h1(int x=1) {}                 // ok: no default specified in base class
  void h2(int x=1) {}                 // ok: same default as in base class
  void h3(int x)   {}                 // ok: does not specify a default
  void h4(int x=2) {}  // 'Method Default Value Mismatch' warning issued here
};

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

LANG.FUNCS.DEFAULT.OVERRIDE : Method Default Value Mismatch

Summary

Properties

Example

Relevant Configuration File Parameters