c++ std::cin timeout (cross platform)

Question

I'm looking for a cross platform (non-threaded or lightweight callback?) timeout for waiting on user input. A simple use case being a service resumes unless interrupted every given epoch.

Ideally a solution interface similar to the following would be great (Up to C++ 17 non experimental solution is acceptable):

std::string confirm = "";
std::string timeoutFallbackValue = "noExit";
std::double timeoutSeconds = 10.0;
std::cin.get(timeoutSeconds , timeoutFallbackValue) >> confirm;

Note: this is through CLI (No GUI's)

There's no such thing in the C++ standard. This is platform-specific. — Sam Varshavchik, Mar 20 '21 at 16:50
You could perhaps create your own and check which OS you're using, and create the function based on that. [this post](https://stackoverflow.com/questions/3213037/determine-if-linux-or-windows-in-c) shows how to check if you're running on windows, for example. — mediocrevegetable1, Mar 20 '21 at 17:00
The standard input is not designed for that. You need to use a library that is designed for user interface. The simpleist version of this would be `ncurses` — Martin York, Mar 20 '21 at 17:02
I think this an **XY** problem occurred because you don't know the UI u will be using — asmmo, Mar 20 '21 at 17:02
I could easy an OS check internally to the solution. The real goal here is have a cross platform interface. — Jamie Nicholl-Shelley, Mar 20 '21 at 17:14
Also discussed [here](https://stackoverflow.com/questions/5322143/add-a-timeout-for-getchar) — Congenital Optimist, Mar 20 '21 at 17:17
@CongenitalOptimist They mentioned use of 'condition_variable::wait_for()' which is a threaded solution. I'm trying to avoid this. — Jamie Nicholl-Shelley, Mar 20 '21 at 17:32
Cross platform IS a std::thread waiting for keyboard input. Otherwise, signal in posix or loop while(!kbhit()). May be some inspiration [here](https://stackoverflow.com/questions/4025891/create-a-function-to-check-for-key-press-in-unix-using-ncurses) — Congenital Optimist, Mar 20 '21 at 17:54
@CongenitalOptimist cross platform yes, but is still threaded. Thanks though. It's looking like I'll have to implement an additional simple class to handle this. — Jamie Nicholl-Shelley, Mar 20 '21 at 18:59

c++ std::cin timeout (cross platform)

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