# LibTmux::FilterExpr#to_proc

- **Module:** LibTmux::FilterExpr#
- **Package:** libtmux
- **Language:** Ruby
- **Kind:** method
- **Source:** https://github.com/libtmux/libtmux-ruby/blob/c6d9d21771828e583692ca899ed817f9640d6a55/gems/libtmux/lib/libtmux/criteria.rb#L101
- **Page:** https://libtmux.org/en/ruby/latest/reference/libtmux-filterexpr-to_proc/

```
LibTmux::FilterExpr#to_proc() -> ^(untyped) -> bool
```

Behavior: Criteria.

Behavior contract: Criteria.