In C++, can member function pointers be used to point to derived (or even base) class members? EDIT: Perhaps an example will help. Suppose we have a hierarchy of three classes X, Y, Z in order of inheritance. Y therefore has a base class X and a derived class Z. Now we can define a member function pointer p for class Y. This is writ...
Basically I have the following class: class StateMachine { ... StateMethod stateA(); StateMethod stateB(); ... }; The methods stateA() and stateB() should be able return pointers to stateA() and stateB(). How to typedef the StateMethod? ...
Consider the following C++ code: class A { public: virtual void f()=0; }; int main() { void (A::*f)()=&A::f; } If I'd have to guess, I'd say that &A::f in this context would mean "the address of A's implementation of f()", since there is no explicit seperation between pointers to regular member functions and virtual membe...
How can i hash (std::tr1::hash or boost::hash) a c++ pointer-to-member-function? Example: I have several bool (Class::*functionPointer)() (not static) that point to several diferent methods of the class Class and i need to hash those pointer-to-member-function. How can i do that? Also how can i compare (std::less) those member funct...
Hi, everyone! I have a class, say, "CDownloader", that reads some XML data and provides access by node names. It features some getter functions, something like this: BOOL CDownloader::getInteger ( const CString &name, int *Value ); BOOL CDownloader::getImage ( const CString &name, BOOL NeedCache, CImage *Image ); BOOL CDownloader::ge...
Okay I have a bit of a problem which i'm struggling to solve. Basically I have an abstract functor class that overloads operator() and derived objects that implement it. I have a function (part of another class) that tries to take an Array of these functor classes and tries to pass a pointer to a member function to the std algorithm fo...
I have a worker thread, which holds a list of 'Thread Actions', and works through them as an when. template <class T> class ThreadAction { public: typedef void (T::*action)(); ThreadAction(T* t, action f) : func(f),obj(t) {} void operator()() { (obj->*func)(); } void (T::*func)(); T* obj; }; It's normally called like...
In C++, is it possible to define a sort order for pointers to member functions? It seems that the operator< is undefined. Also, it's illegal to cast to void*. class A { public: void Test1(){} void Test2(){} }; int main() { void (A::* const one)() = &A::Test1; void (A::* const two)() = &A::Test2; boo...
I need to call a method that expects a function pointer, but what I really want to pass to it is a functor. Here's an example of what I'm trying to do: #include <iostream> #include "boost/function.hpp" typedef int (*myAdder)(int); int adderFunction(int y) { return(2 + y); } class adderClass { public: adderClass(int x) : _x(x) ...
I am trying to specialize some utility code on const member functions, but have problems to get a simple test-case to work. To simplify the work i am utilizing Boost.FunctionTypes and its components<FunctionType> template - a MPL sequence which should contain the tag const_qualified for const member functions. But using the test-code be...
I have a callback mechanism, the classes involved are: class App { void onEvent(const MyEvent& event); void onEvent(const MyOtherEvent& event); Connector connect; } class Connector { template <class T> void Subscribe(boost::function <void (const T&)> callback); } App::App() { connect.Subscribe<MyEvent>(&App::OnEv...
I'm getting a compile error (MS VS 2008) that I just don't understand. After messing with it for many hours, it's all blurry and I feel like there's something very obvious (and very stupid) that I'm missing. Here's the essential code: typedef int (C::*PFN)(int); struct MAP_ENTRY { int id; PFN pfn; }; class C { ...
Hello, I have created a Timer class that must call a callback method when the timer has expired. Currently I have it working with normal function pointers (they are declared as void (*)(void), when the Elapsed event happens the function pointer is called. Is possible to do the same thing with a member function that has also the signat...
I am trying to do the following: Obtain the address of a member function from a class that was locally defined within a function. class ConnectionBase { }; template class<EventType, SinkType> class ConnectionImpl : public ConnectionBase { public: typedef void (SinkType::*EventCallback)(EventType const&); }; template<class EventType> ...
Hi, I have a boost multi index container thus. using namespace boost::multi_index; template < typename O > class Container { public: multi_index_container< O, indexed_by< ordered_unique< const_mem_fun< O, std::string, &O::name > > > > _container; }; As you can se...
So I'm working on this event management class. I'm storing a list of pointers to member functions of the signature void (Event*) where Event is just a struct that stores some random data at the moment. typedef boost::function<void(Event*)> Callback; typedef vector<Callback> CallbackList; class EventManager { public: template<typenam...
Given the following code which I can't get to compile. template < typename OT, typename KT, KT (OT::* KM)() const > class X { public: KT mfn( const OT & obj ) { return obj.*(KM)(); // Error here. } }; class O { public: int func() const { ...
Hello, in C++, I can easily create a function pointer by taking the address of a member function. However, is it possible to change the address of that local function? I.e. say I have funcA() and funcB() in the same class, defined differently. I'm looking to change the address of funcA() to that of funcB(), such that at run time callin...
I have a problem with using a pointer to function in C++. Here is my example: #include <iostream> using namespace std; class bar { public: void (*funcP)(); }; class foo { public: bar myBar; void hello(){cout << "hello" << endl;}; }; void byebye() { cout << "bye" << endl; } int main() { foo testFoo; testFoo...
I had this problem some time ago and I gave up but lately it returned. #include <iostream> class element2D; class node2D { public: void (element2D::*FunctionPtr)(); void otherMethod() { std::cout << "hello" << std::endl; ((this)->*(this->FunctionPtr))(); //ERROR<------------------- } }; class element2D { publ...