rspec/rules/S904/cfamily/rule.adoc

Unused function parameters are often due to design changes and can lead to mismatched parameter lists.


== Noncompliant Code Example

----
class A
{
public:
  virtual void f ( uint16_t * para1, int16_t unusedpara ) = 0; // Noncompliant, unusedpara not used in any of the overriding functions.
};

class B1: public A
{
public:
  virtual void f ( uint16_t * para1, int16_t unusedpara ) // Noncompliant, unusedpara not used in any of the overriding functions.
  {
    *para1 = 1U;
  }
};
----


== Compliant Solution

----
class A
{
public:
  virtual void f ( uint16_t * para1 ) = 0; // Compliant, all parameters used at least once in an overriding function.
};

class B1: public A
{
public:
  virtual void f ( uint16_t * para1 ) // Compliant, all parameters used at least once in an overriding function.
  {
    *para1 = 1U;
  }
};
----


== See

* MISRA {cpp}:2008, 0-1-12 - There shall be no unused parameters (named or unnamed) in the set of parameters for a virtual function and all the functions that override it.