# libtmux::CardinalityError

- **Module:** libtmux
- **Package:** libtmux-cxx
- **Language:** C++
- **Kind:** enum
- **Source:** https://github.com/libtmux/libtmux-cxx/blob/393d4b0ad666f18a6581f1eb281741a75a7503f0/include/libtmux/cardinality.hpp#L22
- **Page:** https://libtmux.org/en/cxx/latest/reference/libtmux-cardinalityerror/

Why a lookup that required exactly one match did not get one.

The two want opposite fixes, which is why they are distinct: one needs wider criteria and the other needs narrower.

## Members

- `none_matched` (constant)
- `several_matched` (constant)