circle_test.cc

#include <iostream>

class circle {
    public:
    void draw();
};

void circle::draw() {
    std::cout << "\n";
    std::cout << "      ****\n";
    std::cout << "    *      *\n";
    std::cout << "   *        *\n";
    std::cout << "   *        *\n";
    std::cout << "   *        *\n";
    std::cout << "    *      *\n";
    std::cout << "      ****\n";
    std::cout << "\n";
}

namespace circle {
    class inner_circle {
        public:
        void draw();
    };

    void inner_circle::draw() {
        std::cout << "\n";
        std::cout << "      ****\n";
        std::cout << "    *      *\n";
        std::cout << "   *   **   *\n";
        std::cout << "   *  *  *  *\n";
        std::cout << "   *   **   *\n";
        std::cout << "    *      *\n";
        std::cout << "      ****\n";
        std::cout << "\n";
    }
}

int main() {
    // This won't work, because g++ doesn't know if it refers to the class or the namespace:
    //circle a_circle;
    class circle a_circle;
    // I can't find a way to do this:
    //circle::inner_circle an_inner_circle;

    a_circle.draw();
    //an_inner_circle.draw();
    return 0;
}