The function std::getline (already introduced with C++98) provides a portable way to implement this:

#include <iostream>
#include <string>

void press_any_key()
{
    std::cout << "Press Enter to Continue";
    std::string temp;
    std::getline(std::cin, temp);
}

I found this thanks to this question and answer after I observed that std::cin << temp; does only return with empty input. So I was wondering how to deal with optional user input (which makes sense for a string variable can of course be empty).

The function std::getline (already introduced with C++98) provides a portable way to implement this:

#include <iostream>
#include <string>

void press_any_key()
{
    std::cout << "Press Enter to Continue";
    std::string temp;
    std::getline(std::cin, temp);
}

I found this thanks to this question and answer after I observed that std::cin >> temp; does not return with empty input. So I was wondering how to deal with optional user input (which makes sense for a string variable can of course be empty).