Using kbhit() and getch() on Linux

On Windows, I have the following code to look for input without interrupting the loop:

#include <conio.h>
#include <Windows.h>
#include <iostream>

int main()
{
    while (true)
    {
        if (_kbhit())
        {
            if (_getch() == 'g')
            {
                std::cout << "You pressed G" << std::endl;
            }
        }
        Sleep(500);
        std::cout << "Running" << std::endl;
    }
}

However, seeing that there is no conio.h, whats the simplest way of achieving this very same thing on Linux?

The ncurses howto cited above can be helpful. Here is an example illustrating how ncurses could be used like the conio example:

#include <ncurses.h>

int
main()
{
    initscr();
    cbreak();
    noecho();
    scrollok(stdscr, TRUE);
    nodelay(stdscr, TRUE);
    while (true) {
        if (getch() == 'g') {
            printw("You pressed G\n");
        }
        napms(500);
        printw("Running\n");
    }
}

Note that with ncurses, the iostream header is not used. That is because mixing stdio with ncurses can have unexpected results.

ncurses, by the way, defines TRUE and FALSE. A correctly configured ncurses will use the same data-type for ncurses' bool as the C++ compiler used for configuring ncurses.