Question

Assuming that init is the last global object being initialized before main() (and we don’t need any command line argument), can I do something like:

struct int_main {
  int_main ()
  {
    //... start code execution
  }
}init;

int main ()
{
}

Asking the question in this way, because I am interested in knowing if main() assures anything other than:

1. argc, argv from command line
2. All global objects are initialized
   before it

Answer 1

You would have a hard time catching any exception from the int_main constructor.

Also you would have a hard time returning a process exit code with complete unwinding of the stack.

That’s mainly what main provides in C++: a place to catch exceptions, and a means to return normally (not just exit) with a specified process exit code.

Cheers & hth.,