MISRA.FUNC.UNUSEDRET

Return value of a non-void function is not used.

MISRA-C++ Rule 0-1-7 (required): The value returned by a function having a non-void return type that is not an overloaded operator shall always be used.

Rationale

In C++ it is possible to call a function without using the return value, which may be an error. The return value of a function shall always be used.

Overloaded operators are excluded, as they should behave in the same way as built-in operators.

Exception

The return value of a function may be discarded by use of a '(void)' cast.

Example

uint16_t func ( uint16_t para1 )
{
   return para1;
}
void discarded ( uint16_t para2 )
{
   func ( para2 );           // value discarded — Non-compliant
   (void)func ( para2 );     // Compliant
}