# io.github.libtmux.scaladsl.query.Expr.unary_!

- **Module:** io.github.libtmux.scaladsl.query
- **Package:** io.github.libtmux:libtmux-scala_3
- **Language:** Scala
- **Kind:** method
- **Source:** https://github.com/libtmux/libtmux-java/blob/f56392b5d9bc7f1f9c1631842333fb90f3d82d40/libtmux-scala/src/main/scala/io/github/libtmux/scaladsl/query/Expr.scala#L36
- **Page:** https://libtmux.org/en/scala/latest/reference/io-github-libtmux-scaladsl-query-expr-unary_/

```
extension [T](e: Expr[T])
def unary_! : Expr[T]
```