Static variables in instance methods

Question

Let\'s say I have this program:

class Foo {
 public:
    unsigned int bar () {
        static unsigned int counter = 0;
        return counter++;
    }
};

int m         


        

Answer 1

Your example was a couple lines away from being something you could compile and test:

#include 
using namespace std;
class Foo {
 public:
    unsigned int bar () {
        static unsigned int counter = 0;
        return counter++;
    }
};

int main ()
{
    Foo a;
    Foo b;

    for (int i=0; i < 10; i++)
      cout<

The output looks like this:

0. 1 / 0
1. 3 / 2
2. 5 / 4
3. 7 / 6
4. 9 / 8
5. 11 / 10
6. 13 / 12
7. 15 / 14
8. 17 / 16
9. 19 / 18

So yes, the counter is shared across all instances.