# libtmux::unexpected

- **Module:** libtmux
- **Package:** libtmux-cxx
- **Language:** C++
- **Kind:** function
- **Source:** https://github.com/libtmux/libtmux-cxx/blob/393d4b0ad666f18a6581f1eb281741a75a7503f0/include/libtmux/expected.hpp#L60
- **Page:** https://libtmux.org/en/cxx/latest/reference/libtmux-unexpected/

```
libtmux::unexpected(typename Error, error: Error &&) -> typename Error
```

A factory rather than an alias: an alias template cannot deduce its argument, so `unexpected(error)` would stop compiling at every call site.