C++超详细讲解逗号操作符

#include <iostream>
using namespace std;
void func(int i)
{
    cout << "func(): i = " << i << endl;
}
int main()
{
    int a[3][3] = {
        (0, 1, 2),
        (3, 4, 5),
        (6, 7, 8)
    };
    int i = 0;
    int j = 0;
    while(i < 5)
        func(i),
    i++;
    for (i = 0; i < 3; i++)
    {
        for (j = 0; j < 3; j++)
        {
            cout << a[i][j] << endl;
        }
    }
    (i, j) = 6;
    cout << "i = " << i << endl;
    cout << "j = " << j << endl;
    return 0;
}

   int a[3][3] = {
        {0, 1, 2},
        {3, 4, 5},
        {6, 7, 8}
    };

while(i < 5)
        func(i),
    i++;

while(i < 5)
{
    func(i);
    i++; 
}

#include <iostream>
using namespace std;
class Test
{
    int mValue;
public:
    Test(int i)
    {
        mValue = i;
    }
    int value()
    {
        return mValue;
    }
};
Test& operator , (const Test& a, const Test& b)
{
    return const_cast<Test&>(b);
}
Test func(Test& i)
{
    cout << "func(): i = " << i.value() << endl;
    return i;
}
int main()
{
    Test t0(0);
    Test t1(1);
    Test tt = (func(t0), func(t1));
    cout << tt.value() << endl;
    return 0;
}

Test tt = (func(t0), func(t1));

Test tt = (operator , (func(t0), func(t1)));

Test& operator , (const Test& a, const Test& b)
{
    return const_cast<Test&>(b);
}