Clearing Input Buffer in C++

// example of filling the input buffer, clearing it to the end of the line so the user
// can't miss entering the string due to the left over enter in the first use of cin

#include<iostream>
#include<limits>

int main(int argc, const char* argv[]){
    // filling the buffer with data
    int x;
    std::cin >> x;

    // clearing the buffer and warning flags to the end of the line
    std::cin.clear();
    std::cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n');

    // filling buffer with string data
    std::string s;
    getline(std::cin, s);

    // clearing the buffer to the end of the file
    std::cin.clear();
    std::cin.ignore(std::numeric_limits<std::streamsize>::max());

    return 0;
}