# V6035. Double negation is present in the expression: !!x.

Analyzer has detected a potential error related to double negation of a variable. Such duplication is confused, and, most likely, contains an error.

Consider the following example:

    if (!(( !filter )))
    {
      ....
    }

This error most likely appeared during code refactoring. For example, a part of a complex logical expression was removed while the negation of the whole result wasn't. As a result, we've got an expression with an opposite meaning.

The fixed version of the code may look like this:

    if ( filter )
    {
      ....
    }

or this:

    if ( !filter )
    {
      ....
    }