What does the first criterion mean in if (std: :cin && c == 'n') for C++?

#include <iostream> #include <stdexcept> using namespace std; int main(void) {         int a;         std::cout << "Please enter an integer: " << std::endl;         while (std::cin >> a) {                 try {                         if (a > 0) {                                 std::cout << a << "Your enter was fucking correct." << std::endl;                                 std::cout << "Please enter an integer: " << std::endl;                         }         else                 throw runtime_error("It is not even an integer.");         }         catch (runtime_error err) {                 std::cout << err.what()                         << "\nTry again? Enter  /d y or' /" << std::endl;                 char c;                 std::cin >> c;                 if (std::cin && c == 'n')                         break;                 std::cout << "Please enter an integer: " << std::endl;         }         }         return 0; }

"std::cin" in "if (std::cin && c == 'n')" is the part that I don't understand.

Before that, c has been already given a value.

I deleted "std::cin" part and the program works the same.

What is the value of "std::cin" here? 

What does "std::cin" mean in this if condition?