# 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:

```cpp
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:

```cpp
if ( filter )
{
  ....
}
```

or this:

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