Retrieve function name programmatically (__FILE__, __FUNCTION__, __LINE__)

Macros __FUNCTION__ allows to retrieve the function name at run-time:

#include <iostream>
using namespace std;

void funct1()
{
    cout << __FUNCTION__ << endl;    
}

void funct2()
{
    cout << __FUNCTION__ << endl;    
}

int main()
{
    funct1();
    funct2();

    if (strcmp(__FUNCTION__, "main") == 0)
    {
        cout << "main()" << endl;
    }
    return 0;
}

How I understand this feature was added in C99:
http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1642.html

It makes sense to mention two other mocros: __LINE__ and __FILE__
Here is a simple example:

#include <iostream>
using namespace std;

int main()
{
    cout << "file name: " << __FILE__ << endl;
    cout << "line number: " << __LINE__ << endl;
    
    int x = 2 * __LINE__;
    cout << "x = 2 * __LINE__ = " << x;
    return 0;
}

Of course it works with the classes:

#include <iostream>
using namespace std;

class A
{
public:
    A()
    {
        cout << __FUNCTION__ << endl;
    }

    ~A()
    {
        cout << __FUNCTION__ << endl;
    }
};

int main()
{
    A a;
    return 0;
}