class A
{
void (*action)();
public: void setAction(void function()) {action = function;}
void activate() {(*action)();}
};
class B : A
{
private: void functionIwantToPass() {...}
public: B()
{ setAction(&B::functionIwantToPass); }
};
How should I put it or modify it?
typedef void (*fnPtr)(class A*);
class A
{
fnPtr action;
public: void setAction(fnPtr function) {action = function; }
void activate() { fnPtr(this);}
};
class B : A
{
private:
static void functionIwantToPass(A* obj) {...} //cast obj to B* here
public: B()
{ setAction(B::functionIwantToPass); }
};
In C++ using function pointers of member functions is not allowed.
[quote name='irreversible' timestamp='1319299606' post='4875347']
In C++ using function pointers of member functions is not allowed.
[quote name='irreversible' timestamp='1319299606' post='4875347']
In C++ using function pointers of member functions is not allowed.
#include <function> //or boost function
void foo(function<void ()> f) { ... }
class x
{
void y() { }
}
//...
x x_inst;
function<void ()> func = bind(&x::y, &x_inst);
foo(func);
template<typename TFunc>
void foo2(TFunc f)
{
function<void ()> func(f);
}
x x_inst; //be careful w/ the ref in the lambda...
foo2( [&] () { x_inst.y(); } );
It is a terribly classic answer, but: could you describe more precisely what you are trying to achieve ?
From your simple example, it seems that just using a virtual method would do the job, without using any function pointer.
So all I need to do is set that function to static. Thanks.
However, I found that I also have to set every variables used in that function to static. That leads to making class B static which leads to unresolved external symbols from static B b[40][40] in another class. I'll try another approach.
[quote name='SriLumpa' timestamp='1319300932' post='4875356']
It is a terribly classic answer, but: could you describe more precisely what you are trying to achieve ?
From your simple example, it seems that just using a virtual method would do the job, without using any function pointer.
