Performs code before the main function has been invoked.

gistfile1.txt

#include <iostream>

static int x = []()
{
    std::cout << "x - Performs before main function" << std::endl;
    return 0;
}();

class y
{
public:
    y()
    {
        std::cout << "y - Performs before main function" << std::endl;
    }
} fuck;

int main()
{
    std::cout << "Performs inside main function" << std::endl;
    return 0;
}