# libtmux::is

- **Module:** libtmux
- **Package:** libtmux-cxx
- **Language:** C++
- **Kind:** function
- **Source:** https://github.com/libtmux/libtmux-cxx/blob/393d4b0ad666f18a6581f1eb281741a75a7503f0/include/libtmux/relations.hpp#L121
- **Page:** https://libtmux.org/en/cxx/latest/reference/libtmux-is/

```
libtmux::is(typename Entity, name: std::string, read: auto, predicate: auto) -> typename Entity
```

An absent to-one link never satisfies `is`: a window with no active pane is not a window whose active pane runs an editor.