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V516. Non-null function pointer is comp…
Analyzer diagnostics
General Analysis (C++)
General Analysis (C#)
General Analysis (Java)
Diagnosis of micro-optimizations (C++)
Diagnosis of 64-bit errors (Viva64, C++)
MISRA errors
AUTOSAR errors
OWASP errors (C#)
Additional information
Contents

V516. Non-null function pointer is compared to null. Consider inspecting the expression.

May 30 2012

Code contains a construct comparing a non-null pointer to a function with null. It is most probably that there is a misprint in code – parentheses are missing.

Consider this example:

int Foo();
void Use()
{
  if (Foo == 0)
  {
    //...
  }
}

The condition "Foo == 0" is meaningless. The address of the 'Foo' function never equals zero, so the comparison result will always be 'false'. In the code we consider, the programmer missed parentheses by accident. This is the correct version of the code:

if (Foo() == 0)
{
  //...
}

If there is an explicit taking of address, the code is considered correct. For example:

int Foo();
void Use()
{
  if (&Foo != NULL)
    //...
}

This diagnostic is classified as:

You can look at examples of errors detected by the V516 diagnostic.

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