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copied!<p>You need to pass a <code>Job</code> pointer to the <code>Display</code>, and vice versa, so they know about each other, eg:</p> <p>Main:</p> <pre><code>#include "Display.h" #include "Job.h" int main() { Display display; Job job; display.init(&job); job.init(&display); display.test(); return 0; } </code></pre> <p>Display.h:</p> <pre><code>class Job; class Display { private: Job *_job; public: Display(); void init(Job *job); void test(); void test2(const std::string &ttt); }; </code></pre> <p>Display.cpp:</p> <pre><code>#include "Display.h" Display::Display() : _job(NULL) { } void Display::init(Job *job) { _job = job; } void Display::test() { std::cout << "testing.." << std::endl; } void Display::test2(const std::string &ttt) { std::cout << "testing3333...." << _job->getThree() << std::endl; std::cout << "testing2222...." << ttt << std::endl; } </code></pre> <p>Job.h:</p> <pre><code>class Display; class Job { private: Display *_display; public: Job(); void init(Display *display); std::string getThree(); }; </code></pre> <p>Job.cpp:</p> <pre><code>#include "Job.h" Job::Job() : _display(NULL) { } void Job::init(Display *display) { _display = display; _display->test2("from Job"); } std::string Job::getThree() { return "test3"; } </code></pre> <p>Given the requirements you mentioned, the <code>Display</code> does not really need to remember the <code>Job</code>, only the <code>Job</code> needs to remember the <code>Display</code>, so you could do something like this as an alternative:</p> <p>Main:</p> <pre><code>#include "Display.h" #include "Job.h" int main() { Display display; Job job; job.init(&display); display.test(); return 0; } </code></pre> <p>Display.h:</p> <pre><code>class Job; class Display { public: void test(); void test2(Job *job); }; </code></pre> <p>Display.cpp:</p> <pre><code>#include "Display.h" void Display::test() { std::cout << "testing.." << std::endl; } void Display::test2(Job *job) { std::cout << "testing3333...." << job->getThree() << std::endl; } </code></pre> <p>Job.h:</p> <pre><code>class Display; class Job { private: Display *_display; public: Job(); void init(Display *display); std::string getThree(); }; </code></pre> <p>Job.cpp:</p> <pre><code>#include "Job.h" Job::Job() : _display(NULL) { } void Job::init(Display *display) { _display = display; _display->test2(this); } std::string Job::getThree() { return "test3"; } </code></pre>

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