C++ :: Including Cocoa In A Program

I am running OS X Lion 10.7.5 and trying to include cocoa.

#include <iostream>
#include <Cocoa/Cocoa.h>
int main(int argc, char** argv) {
std::cout << "Hello, world!" << std::endl;
return 0;
}

When I attempt to compile the above code, I get several thousand errors, mostly "stray ‘@’ in program", coming from the cocoa framework. It compiles and runs correctly if I omit the cocoa include or if I name the file main.mm instead of main.cpp.

I'm pretty sure it's failing because cocoa is written in objective c and I'm reading it as c++ code..how to include an objective c file in a c++ program?