Question

I am writing a wrapper for a multithreaded scheme. It should operate similar to a timer.

I have a particular class (clock) that implements a function called tick which should be passed to constructor. How do I describe a C++ style function (myClass::myfunction, as opposed to the C convention) as the parameter to a method or constructor?

Would anybody be kind enough to show me the declaration for this kind of constructor?

clock myInstance(otherClass::aMethod)
myInstance.tick(); // Should call otherClass::aMethod
myInstance.tick();

Does C++11 and Bind help?

Answer 1

You can either call a static member function of a class or a non-static member function of an object. A non-static member function needs to have the context of an object (this pointer).

Here’s a simplified example of how you can use functors and bind to call a member function.

#include <functional>

class clock
{
public:
   clock(const std::function<void()>& tocall) : m_tocall(tocall) {}
   void tick() {m_tocall();}

private:
   std::function<void()> m_tocall;
};

class otherclass
{
public:
   void aMethod() {}
};

int main(int argc, char *argv[])
{
   otherclass A;
   clock c( std::bind(&otherclass::aMethod, &A) );

   c.tick(); // Will end up calling aMethod() of object A
}