Default arguments aren't overloads

gistfile1.cpp

#include <iostream>
using namespace std;
 
// #include <some header>
void foo(int x, int y);
 
// but we always use y = 2 with foo
void foo(int x, int y = 2);

int main()
{
        foo(1);
}

// and later link to the One Definition of foo
void foo(int x, int y)
{
        cout << "x: " << x << " y: " << y << endl;
}