g++ does not show a 'unused' warning

Question

I have a little piece of code in C++:

#include 
#include 
#include 

using namespace std;

int main() {

    in         


        

Answer 1

Because you could have done that with a purpose. It's not a primitive. Maybe the constructor and destructor do something important?

MFC even had classes that operated that way, you could do this:

void foo()
{
    CWaitCursor cursor;

    [...]
}

That would display an hourglass icon for the duration of the function.