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copied!<p>The best solution, use <code>boost::function</code> with <code>boost::bind</code>, or if your compiler supports tr1/c++0x use <code>std::tr1::function</code> and <code>std::tr1::bind</code>.</p> <p>So it becomes as simple as:</p> <pre><code>boost::function<void()> callback; Target myTarget; callback=boost::bind(&Target::doSomething,&myTarget); callback(); // calls the function </code></pre> <p>And your set callback becomes:</p> <pre><code>class MyClassWithCallback{ public: void setCallback(boost::function<void()> const &cb) { callback_ = cb; } void call_it() { callback_(); } private: boost::function<void()> callback_; }; </code></pre> <p>Otherwise you need to implement some abstract class</p> <pre><code>struct callback { virtual void call() = 0; virtual ~callback() {} }; struct TargetCallback { virtual void call() { ((*self).*member)()); } void (Target::*member)(); Target *self; TargetCallback(void (Target::*m)(),Target *p) : member(m), self(p) {} }; </code></pre> <p>And then use:</p> <pre><code>myCaller.setCallback(new TargetCallback(&Target::doSomething,&myTarget)); </code></pre> <p>When your class get modified into:</p> <pre><code>class MyClassWithCallback{ public: void setCallback(callback *cb) { callback_.reset(cb); } void call_it() { callback_->call(); } private: std::auto_ptr<callback> callback_; }; </code></pre> <p>And of course if the function you want to call does not change you may just implement some interface, i.e. derive Target from some abstract class with this call.</p>

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