# libtmux::lower

- **Module:** libtmux
- **Package:** libtmux-cxx
- **Language:** C++
- **Kind:** function
- **Source:** https://github.com/libtmux/libtmux-cxx/blob/393d4b0ad666f18a6581f1eb281741a75a7503f0/include/libtmux/lowering.hpp#L92
- **Page:** https://libtmux.org/en/cxx/latest/reference/libtmux-lower/

```
libtmux::lower(typename Entity, typename Sink, expr: const FilterExpr< Entity > &, sink: Sink &) -> typename Entity
```

A sink receives one call per node in prefix order.

Groups and negations are bracketed by begin/end so a sink never has to count operands itself.